WO2022044220A1

WO2022044220A1 - Draw-out type circuit breaker

Info

Publication number: WO2022044220A1
Application number: PCT/JP2020/032449
Authority: WO
Inventors: 俊則木村; 真也渡邉; 康平倉田
Original assignee: 三菱電機株式会社
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2022-03-03
Also published as: JP6956915B1; JPWO2022044220A1

Abstract

A draw-out type circuit breaker (100) comprises: a draw-out frame (F); a body (B); a body-side terminal (1); a draw-out frame-side terminal (4); and a junction (J). The body-side terminal (1) includes a body-side thick part (2), and a body-side thin part (3). A first finger (7) and a second finger (8) of the junction (J) can be connected to the body-side thin part (2) by pinching a body-side first surface (1S1) and a body-side second surface (1S2) along a second direction (DR2). The size of the body-side thin part (2) in the second direction (DR2) is smaller than that of the body-side thick part (3) in the second direction (DR2). The body-side first surface (1S1) and the body-side second surface (1S2) of the body-side thin part (2) are flat.

Description

Drawer type circuit breaker

This disclosure relates to a drawer type circuit breaker.

Conventionally, the main body side terminal and the drawer frame side terminal of the drawer type circuit breaker can be attached to and detached from the junction. When the main body side terminal and the drawer frame side terminal are inserted into the junction, the first finger and the second finger of the junction sandwich the main body side terminal. When the main body side terminal is inserted into the junction, the main body side terminal and the drawer frame side terminal are energized. When the main body side terminal and the drawer frame side terminal are energized, Lorentz force acts on the first finger and the second finger in the direction of approaching each other. In the drawer type circuit breaker, in order to guarantee the strength against the short circuit current in the event of an accident, there is a problem in the strength of the drawer type circuit breaker even when the current determined for the rating is passed through the drawer type circuit breaker. A short-circuit withstand current test is performed to verify that there is no such thing. In the short-time withstand current test, it is verified that the deviation of the first finger and the second finger from the main body side terminal is suppressed.

As the above-mentioned drawer type circuit breaker, there is an aerial circuit breaker described in Japanese Patent Application Laid-Open No. 2008-10332 (Patent Document 1). A bent surface that meshes with a pair of contacts (first finger and second finger) of a finger module (junction) is provided on the end side surface of the connector (main body side terminal). The pair of contacts sandwich the bent surface. In the portion most recessed by the bent surface of the connector, the distance between the contacts is closer than in the other portions of the connector. Therefore, in the most recessed portion, the Lorentz force acting in the direction of bringing the pair of contacts closer to each other is larger than in the other portions. Therefore, the performance in the short-time withstand current test is improved.

Japanese Unexamined Patent Publication No. 2008-10332 (Patent Document 1)

In the drawer type circuit breaker described in the above document, when the main body side terminal is attached to and detached from the junction, the first finger and the second finger are rotated so that the first finger and the second finger are along the bending surface. I need to let you. Therefore, the detachability between the terminal on the main body side and the junction is reduced.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a drawer type circuit breaker capable of suppressing a decrease in detachability between a terminal on the main body side and a junction.

The drawer type circuit breaker of the present disclosure includes a drawer frame, a main body portion, a main body portion side terminal, a drawer frame side terminal, and a junction. The main body is configured to be able to be pulled out with respect to the drawer frame. The main body side terminal includes a main body side thick wall portion and a main body portion side thin wall portion. The thick portion on the main body side is connected to the main body portion. The thin wall portion on the main body portion side is aligned with the thick wall portion on the main body portion side along the first direction. The drawer frame side terminal is connected to the drawer frame so as to face the main body side terminal along the first direction. The junction can be connected to the drawer frame side terminal inside the drawer frame. The terminal on the main body side is configured to be connectable to a junction by moving the main body with respect to the drawer frame. The thin-walled portion on the main body portion side has a first surface on the main body portion side and a second surface on the main body portion side. The first surface on the main body side and the second surface on the main body side face each other in parallel along the second direction. The second direction is orthogonal to the first direction. The junction includes a first finger and a second finger. The first finger and the second finger of the junction can be connected to the thin wall portion on the main body portion side by sandwiching the first surface on the main body portion side and the second surface on the main body portion side along the second direction. The dimension along the first direction of the thick portion on the main body portion side is larger than the dimension along the first direction of the thin wall portion on the main body portion side. The dimension along the second direction of the thin wall portion on the main body portion side is smaller than the dimension along the second direction of the thick wall portion on the main body portion side. The first surface of the thin-walled portion on the main body side and the second surface on the main body side are flat.

According to the drawer type circuit breaker of the present disclosure, the first surface on the main body side and the second surface on the main body side of the thin wall portion on the main body side are flat. Therefore, when the first finger and the second finger of the junction sandwich the thin wall portion on the main body portion side, the force can be reduced. Therefore, it is possible to suppress a decrease in detachability.

FIG. 3 is a partial cross-sectional top view schematically showing a configuration of a drawer type circuit breaker according to the first embodiment. It is a partial cross-sectional side view which shows the structure of the drawer type circuit breaker which concerns on Embodiment 1. It is a partial cross-sectional enlarged top view which shows the structure of the drawer type circuit breaker which concerns on Embodiment 1. First main body side terminal part, second main body part side terminal part, first drawer frame side terminal, second drawer frame side terminal part, first junction part, second junction of the drawer type circuit breaker which concerns on Embodiment 1. It is a partial cross-sectional top view which shows roughly the structure of the part, the drawer frame and the main body part. Third main body side terminal part, fourth main body part side terminal part, third drawer frame side terminal, fourth drawer frame side terminal part, third junction part, fourth junction of the drawer type circuit breaker which concerns on Embodiment 1. It is a partial cross-sectional top view which shows roughly the structure of the part, the drawer frame and the main body part. First main body side terminal part, third main body part side terminal part, first drawer frame side terminal, third drawer frame side terminal part, first junction part, third junction of the drawer type circuit breaker which concerns on Embodiment 1. It is a partial cross-sectional side view which shows roughly the structure of the part, the drawer frame and the main body part. 2nd main body side terminal part, 4th main body part side terminal part, 2nd drawer frame side terminal, 4th drawer frame side terminal part, 2nd junction part, 4th junction of the drawer type circuit breaker which concerns on Embodiment 1. It is a partial cross-sectional side view which shows roughly the structure of the part, the drawer frame and the main body part. FIG. 3 is a partial cross-sectional top view schematically showing the configurations of the R phase portion, the S phase portion, and the T phase portion of the drawer type circuit breaker according to the first embodiment. It is a graph which shows the time change of the alternating current which concerns on Embodiment 1. FIG. 5 is an enlarged top view schematically showing a first Lorentz force generated in the drawer type circuit breaker according to the first embodiment. FIG. 3 is a partial cross-sectional top view schematically showing a second Lorentz force generated in the drawer type circuit breaker according to the first embodiment. FIG. 3 is a partial cross-sectional top view schematically showing a third Lorentz force generated in the drawer type circuit breaker according to the first embodiment. FIG. 3 is a partial cross-sectional top view schematically showing a fourth Lorentz force generated in the drawer type circuit breaker according to the first embodiment. FIG. 3 is a partial cross-sectional top view schematically showing a state in which the drawer type circuit breaker according to the first embodiment is displaced in the second direction. It is a graph which shows the time change of the contact number of the 1st finger and the 2nd finger with the main body side terminal. It is a graph which shows roughly the relationship between the thickness of the thick portion and the suction force which concerns on Embodiment 1. FIG. FIG. 3 is a partial cross-sectional top view schematically showing a configuration of a drawer type circuit breaker according to a second embodiment. FIG. 3 is a partial cross-sectional top view schematically showing a configuration of a drawer type circuit breaker according to the third embodiment. A state in which the main body side stopper portion of the drawer type circuit breaker according to the third embodiment is sandwiched between the first finger portion and the second finger portion of the first finger and the third finger portion and the fourth finger portion of the second finger. It is sectional drawing which shows roughly. A state in which the drawer frame side stopper portion of the drawer type circuit breaker according to the third embodiment is sandwiched between the first finger portion and the second finger portion of the first finger and the third finger portion and the fourth finger portion of the second finger. It is sectional drawing which shows roughly. FIG. 3 is a partial cross-sectional top view schematically showing a configuration of a drawer type circuit breaker according to a fourth embodiment. It is a partial cross-sectional enlarged top view which shows the structure of the drawer type circuit breaker which concerns on Embodiment 4. FIG. 3 is a partial cross-sectional top view schematically showing a configuration of a drawer type circuit breaker according to a fifth embodiment. FIG. 3 is a partial cross-sectional top view schematically showing the configuration of the drawer type circuit breaker according to the sixth embodiment. It is sectional drawing which shows typically the state in which the 1st finger and the 2nd finger of the drawer type circuit breaker which concerns on Embodiment 6 are fitted. FIG. 3 is a top view schematically showing a current density vector generated in the drawer type circuit breaker according to the sixth embodiment. It is a top view which shows schematic the current density vector generated in the drawer type circuit breaker which does not provide a protrusion. It is a graph which shows roughly the suction force generated in the drawer type circuit breaker which concerns on Embodiment 6 and the pull-out type circuit breaker which does not provide a protrusion. FIG. 3 is a partial cross-sectional top view schematically showing the configuration of the drawer type circuit breaker according to the seventh embodiment. It is sectional drawing which shows typically the state in which the 1st finger and the 2nd finger of the drawer type circuit breaker which concerns on Embodiment 7 are fitted. FIG. 3 is a partial cross-sectional top view schematically showing a configuration of a drawer type circuit breaker according to the eighth embodiment. It is a graph which shows roughly the relationship between the thickness of a thick part and the thickness of a thin part in a state where the resistance value of a drawer type circuit breaker is constant.

Hereinafter, embodiments will be described with reference to the figures. In the following, the same or corresponding parts will be designated by the same reference numerals, and duplicate explanations will not be repeated.

Embodiment 1.
The configuration of the drawer type circuit breaker 100 according to the first embodiment will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the drawer type circuit breaker 100 includes a main body side terminal 1, a drawer frame side terminal 4, a main body part B, a drawer frame F, and a junction J. The drawer type circuit breaker 100 is a so-called air circuit breaker. FIG. 1 is a partial cross-sectional top view showing the inside and the outside of the drawer frame F.

The drawer frame F is fixed to a board or the like (not shown). The main body B is configured to be able to be pulled out with respect to the drawer frame F. The main body portion B is configured to be drawable with respect to the drawer frame F along the first direction DR1 (X-axis direction) described later. The main body B is configured to be drawable with respect to the drawer frame F by, for example, a rail (not shown) attached to the drawer frame F.

When the main body B is pulled out from the inside of the drawer frame F, the junction J is detached from the main body side terminal 1. As a result, the current-carrying path is cut off, so that the drawer disconnector 100 is disconnected. For example, when the drawer type circuit breaker 100 is inspected or the like, the drawer type circuit breaker 100 is in a disconnected state.

The junction J can be connected to the main body side terminal 1 and the drawer frame side terminal 4 inside the drawer frame F. Junction J includes a first finger 7 and a second finger 8. The junction J is configured such that the main body side terminal 1 is inserted and removed between the first finger 7 and the second finger 8. As a result, the terminal 1 on the main body side can be connected to the junction J. In a state where the main body side terminal 1 is connected to the junction J, the first finger 7 and the second finger 8 sandwich the main body side terminal 1 and the drawer frame side terminal 4.

The first finger 7 includes a first finger portion and a second finger portion (not shown). The first finger portion and the second finger portion are laminated along the third direction DR3 (Z-axis direction) described later. The number of the first finger portion and the second finger portion is, for example, 10 or more and 100 or less in total. The second finger 8 includes a third finger portion and a fourth finger portion (not shown). The third finger portion and the fourth finger portion are laminated along the third direction DR3 (Z-axis direction). The number of the third finger portion and the fourth finger portion is, for example, 10 or more and 100 or less in total.

The main body side terminal 1 is configured to be connectable to the junction J by moving the main body B with respect to the drawer frame F. The main body side terminal 1 includes a main body side thick wall portion 2 and a main body portion side thin wall portion 3. The thick portion 2 on the main body side is connected to the main body B. The thick portion 2 on the main body side is fixed to the main body B. The junction J is arranged inside the drawer frame F away from the thick portion 2 on the main body portion side.

The thin wall portion 3 on the main body portion side is aligned with the thick wall portion 2 on the main body portion side along the first direction DR1 (X-axis direction). The thin-walled portion 3 on the main body portion protrudes from the thick-walled portion 2 on the main body portion side toward the side opposite to the main body portion B.

The thin-walled portion 3 on the main body portion side has a first surface 1S1 on the main body portion side and a second surface 1S2 on the main body portion side. The main body side first surface 1S1 and the main body side second surface 1S2 face each other in parallel along the second direction DR2 (Y-axis direction). The second direction DR2 (Y-axis direction) is orthogonal to the first direction DR1 (X-axis direction). The main body side first surface 1S1 and the main body side second surface 1S2 of the main body side thin wall portion 3 are flat. Therefore, the thin-walled portion 3 on the main body portion side has a flat plate shape.

In the present embodiment, the first direction DR1 (X-axis direction) is the direction in which the thick portion 2 on the main body side and the thin wall portion 3 on the main body portion side are arranged side by side. The second direction DR2 (Y-axis direction) is a direction in which the first surface 1S1 on the main body side and the second surface 1S2 on the main body side face each other. As shown in FIGS. 1 and 2, the third direction DR3 (Z-axis direction) is a direction orthogonal to each of the first direction DR1 (X-axis direction) and the second direction DR2 (Y-axis direction). The X-axis direction is a direction along the first direction DR1 (X-axis direction). The Y-axis direction is a direction along the second direction DR2 (Y-axis direction). The Z-axis direction is a direction along the third direction DR3 (Z-axis direction).

As shown in FIG. 1, the dimension of the thick portion 2 on the main body side along the first direction DR1 (X-axis direction) is along the first direction DR1 (X-axis direction) of the thin wall portion 3 on the main body side. Greater than the dimensions. Therefore, the thick portion 2 on the main body side is longer than the thin portion 3 on the main body portion side. As shown in FIG. 3, the dimensions of the thin wall portion 3 on the main body side along the second direction DR2 (Y-axis direction) are along the second direction DR2 (Y-axis direction) of the thick wall portion 2 on the main body portion side. Smaller than the dimensions. Therefore, the thin wall portion 3 on the main body portion side is thinner than the thick wall portion 2 on the main body portion side.

The dimension along the second direction DR2 (Y-axis direction) of the main body side thin-walled portion 3 according to the present embodiment is 0. It is 3 times or more and 1.0 times or less. The sum of the dimensions along the second direction DR2 (Y-axis direction) of the main body side thin wall portion 3 and the dimensions along the second direction DR2 (Y axis direction) with the main body portion side thick wall portion 2 is the drawer frame side. It is 1.5 times or more the dimension along the second direction DR2 (Y-axis direction) of the terminal 4.

The first finger 7 and the second finger 8 can be connected to the thin wall portion 3 on the main body side by sandwiching the first surface 1S1 on the main body side and the second surface 1S2 on the main body side. In a state where the main body side terminal 1 is connected to the junction J, the first finger 7 and the second finger 8 sandwich the main body side first surface 1S1 and the main body side second surface 1S2.

In a state where the terminal 1 on the main body side is connected to the junction J, a current flows in each of the first finger 7 and the second finger 8 in the same direction. The currents flowing through the first finger 7 and the second finger 8 are flowing in the same direction along the X-axis direction.

The drawer frame side terminal 4 is connected to the drawer frame F so as to face the main body side terminal 1 along the first direction DR1 (X-axis direction). The drawer frame side terminal 4 is fixed to the drawer frame F. The junction J is connected to the main body side terminal 1 and the drawer frame side terminal 4 inside the drawer frame F. The drawer frame side terminals 4 face the main body side terminals 1 at intervals.

The drawer frame side terminal 4 includes a drawer frame side thick wall portion 5 and a drawer frame side thin wall portion 6. The drawer frame side thick portion 5 is connected to the drawer frame F. The drawer frame side thick portion 5 is fixed to the drawer frame F. The junction J is arranged inside the drawer frame F away from the thick portion 5 on the drawer frame side.

The drawer frame side thin wall portion 6 is lined up with the drawer frame side thick wall portion 5 along the first direction DR1 (X-axis direction). The drawer frame side thin-walled portion 6 projects from the drawer frame-side thick-walled portion 5 toward the side opposite to the drawer frame F.

The drawer frame side thin-walled portion 6 has a drawer frame side first surface 4S1 and a drawer frame side second surface 4S2. The drawer frame side first surface 4S1 and the drawer frame side second surface 4S2 face each other in parallel along the second direction DR2 (Y-axis direction). The second direction DR2 (Y-axis direction) is orthogonal to the first direction DR1 (X-axis direction). The drawer frame side first surface 4S1 and the drawer frame side second surface 4S2 of the drawer frame side thin wall portion 6 are flat. Therefore, the drawer frame side thin-walled portion 6 has a flat plate shape.

Each of the first surface 1S1 on the main body side and the first surface 4S1 on the drawer frame side may be arranged on the same plane. The surface on which each of the first surface 1S1 on the main body side and the first surface 4S1 on the drawer frame side is arranged is a plane formed by the X-axis and the Z-axis. Further, each of the second surface 1S2 on the main body side and the second surface 1S2 on the main body side may be arranged on the same plane. The plane on which each of the second plane and the second plane 4S2 on the drawer frame side is arranged is a plane formed by the X-axis and the Z-axis.

As shown in FIG. 1, the dimension of the drawer frame side thick portion 5 along the first direction DR1 (X-axis direction) is along the first direction DR1 (X-axis direction) of the drawer frame side thin wall portion 6. Smaller than the dimensions. Therefore, the drawer frame side thick portion 5 is shorter than the drawer frame side thin wall portion 6. The dimension along the second direction DR2 (Y-axis direction) of the drawer frame side thin wall portion 6 is smaller than the dimension along the second direction DR2 (Y-axis direction) of the drawer frame side thick wall portion 5. Therefore, the drawer frame side thin wall portion 6 is thinner than the drawer frame side thick wall portion 5.

As shown in FIG. 2, an inlet conductor Cin and an outlet conductor Cout may be connected to the drawer type circuit breaker 100. The drawer frame side terminal 4 is connected to the inlet conductor Cin or the outlet conductor Cout via the conversion component T. The conversion component T includes a first part T1 and a second part T2. The longitudinal direction of the first part T1 is along the Z axis. The second part T2 is connected to the first part T1 on the side opposite to the drawer frame side terminal 4 with respect to the first part. The longitudinal direction of the second part T2 is along the X axis. A drawer frame side terminal 4 is connected to the first part T1. An inlet conductor Cin or an outlet conductor Cout is connected to the second part. FIG. 2 is a partial cross-sectional side view showing the inside and the outside of the drawer frame F.

In the present embodiment, the longitudinal direction of the drawer frame side terminal 4 is along the Z axis. Therefore, the longitudinal direction of the drawer frame side terminal 4 is the same as the longitudinal direction of the first portion T1. Further, the longitudinal directions of the inlet conductor Cin and the outlet conductor Cout are along the X axis. Therefore, the longitudinal direction of the inlet conductor Cin and the outlet conductor Cout is the same as the longitudinal direction of the second part T2. Further, the longitudinal directions of the inlet conductor Cin and the outlet conductor Cout are different from the longitudinal directions of the lead-out frame side terminals 4. Since the leader frame side terminal 4 is connected to the outer conductor via the conversion component T, even if the longitudinal direction of the leader frame side terminal 4 is different from the longitudinal direction of the inlet conductor Cin and the outlet conductor Cout. , The drawer frame side terminal 4 is easily connected to the inlet conductor Cin and the outlet conductor Cout.

Next, the configurations of the junction J, the main body side terminal 1 and the drawer frame side terminal 4 according to the first embodiment will be described in detail with reference to FIGS. 3 to 7.

As shown in FIG. 3, the junction J includes a first spring portion 91, a second spring portion 92, and a frame portion 93. The first spring portion 91 and the second spring portion 92 are, for example, leaf springs. The first spring portion 91 is attached to the first finger 7 on the side opposite to the second finger 8 with respect to the first finger 7. The second spring portion 92 is attached to the second finger 8 on the side opposite to the first finger 7 with respect to the second finger 8. The frame portion 93 sandwiches the first spring portion 91 and the second spring portion 92 along the second direction DR2 (Y-axis direction). The frame portion 93 sandwiches the first spring portion 91 and the second spring portion 92 in the second direction DR2 (Y-axis direction), so that the first finger 7 and the second finger 8 are the first spring portion 91 and the second spring. The portion 92 is pressed against the main body portion side terminal 1 and the drawer frame side terminal 4.

The first finger 7, the second finger 8, the first spring portion 91 and the second spring portion 92 are supported by the frame portion 93. Further, the first finger 7 and the second finger 8 are supported by the frame portion 93 and the support component SP in a state where the junction J is not connected to the main body portion side terminal 1 and the drawer frame side terminal 4.

As shown in FIGS. 4 and 5, the main body side terminal 1 includes a first main body side terminal portion 11, a second main body portion side terminal portion 12, a third main body portion side terminal portion 13, and a fourth. It includes a terminal portion 14 on the main body portion side. The second main body side terminal portion 12, the third main body portion side terminal portion 13, and the fourth main body portion side terminal portion 14 are electrically connected to the first main body portion side terminal portion 11.

The drawer frame side terminal 4 includes a first drawer frame side terminal portion 41, a second drawer frame side terminal portion 42, a third drawer frame side terminal portion 43, and a fourth drawer frame side terminal portion 44. .. The second drawer frame side terminal portion 42, the third drawer frame side terminal portion 43, and the fourth drawer frame side terminal portion 44 are electrically connected to the first drawer frame side terminal portion 41.

The junction J includes a first junction portion J1, a second junction portion J2, a third junction portion J3, and a fourth junction portion J4.

As shown in FIG. 4, the first main body side terminal portion 11 has a first main body portion side thick wall portion 21 and a first main body portion side thin wall portion 31. The thin wall portion 31 on the first main body portion side is aligned with the thick wall portion 21 on the first main body portion side along the first direction DR1 (X-axis direction). The dimension of the thin wall portion 31 on the first main body side along the second direction DR2 (Y-axis direction) is smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick wall portion 21 on the first main body portion side. ..

The first drawer frame side terminal portion 41 has a first drawer frame side thick wall portion 51 and a first drawer frame side thin wall portion 61. The thin-walled portion 61 on the first drawer frame side is aligned with the thick-walled portion 51 on the first drawer frame side along the first direction DR1 (X-axis direction). The dimension of the thin wall portion 61 on the first drawer frame side along the second direction DR2 (Y-axis direction) is smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick portion 51 on the first drawer frame side. ..

The first junction portion J1 sandwiches the thin-walled portion 31 on the side of the first main body portion along the second direction DR2 (Y-axis direction). The first junction portion J1 electrically connects the first main body portion side terminal portion 11 and the first drawer frame side terminal portion 41 by sandwiching each of the first main body portion side thin-walled portion 31 and the first drawer frame side thin-walled portion 61. Can be connected.

The second main body side terminal portion 12 is arranged away from the first main body portion side terminal portion 11 along the second direction DR2 (Y-axis direction). The second main body side terminal portion 12 has a second main body portion side thick wall portion 22 and a second main body portion side thin wall portion 32. The thin wall portion 32 on the second main body portion side is aligned with the thick wall portion 22 on the second main body portion side along the first direction DR1 (X-axis direction). The dimension of the thin wall portion 32 on the second main body side along the second direction DR2 (Y-axis direction) is smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick wall portion 22 on the second main body portion side. ..

The second drawer frame side terminal portion 42 is arranged along the second direction DR2 (Y-axis direction) away from the first drawer frame side terminal portion 41. The second drawer frame side terminal portion 42 has a second drawer frame side thick wall portion 52 and a second drawer frame side thin wall portion 62. The second drawer frame side thin wall portion 62 is aligned with the second drawer frame side thick wall portion 52 along the first direction DR1 (X-axis direction). The dimension of the thin wall portion 62 on the second drawer frame side along the second direction DR2 (Y-axis direction) is smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick portion 52 on the second drawer frame side. ..

The second junction portion J2 is arranged away from the first junction portion J1 along the second direction DR2 (Y-axis direction). The second junction portion J2 sandwiches the second main body portion side thin-walled portion 32 along the second direction DR2 (Y-axis direction). The second junction portion J2 electrically connects the second main body portion side terminal portion 12 and the second drawer frame side terminal portion 42 by sandwiching each of the second main body portion side thin-walled portion 32 and the second drawer frame side thin-walled portion 62. Can be connected.

The current that sequentially flows through the first drawer frame side terminal portion 41, the first junction portion J1 and the first main body portion side terminal portion 11 is the second drawer frame side terminal portion 42, the second junction portion J2 and the second main body portion side terminal. The current flowing sequentially through the unit 12 flows in the same direction along the first direction DR1 (X-axis direction).

The current flowing from the inlet conductor Cin to the drawer type circuit breaker 100 is separated at the first drawer frame side terminal portion 41 and the second drawer frame side terminal portion 42, and then merges at the main body portion B. Specifically, the current flowing from the inlet conductor Cin into the drawer type circuit breaker 100 passes through the first drawer frame side terminal portion 41, the first junction portion J1 and the first main body portion side terminal portion 11 in order, and the main body portion B. Flow to. Further, the current flowing into the drawer type circuit breaker 100 from the inlet conductor Cin sequentially passes through the second drawer frame side terminal portion 42, the second junction portion J2, and the second main body portion side terminal portion 12 and flows to the main body portion B.

As shown in FIG. 6, the third main body side terminal portion 13 is arranged along the third direction DR3 (Z-axis direction) away from the first main body portion side terminal portion 11. The third drawer frame side terminal portion 43 is arranged away from the first drawer frame side terminal portion 41 along the third direction DR3 (Z-axis direction). The third junction portion J3 is arranged along the third direction DR3 (Z-axis direction) away from the first junction portion J1.

The current flowing sequentially through the first drawer frame side terminal portion 41, the first junction portion J1 and the first main body portion side terminal portion 11 is the third main body portion side terminal portion 13, the second junction portion J2 and the second drawer frame side terminal. The current flowing sequentially through the unit 42 flows in the opposite direction along the first direction DR1 (X-axis direction). In FIG. 6, the current flow is illustrated by a alternate long and short dash line.

The third main body side terminal portion 13 has a third main body portion side thick wall portion 23 and a third main body portion side thin wall portion 33. The thin wall portion 33 on the third main body portion side is aligned with the thick wall portion 23 on the third main body portion side along the first direction DR1 (X-axis direction). The dimension of the thin wall portion 33 on the third main body side along the second direction DR2 (Y-axis direction) is smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick wall portion 23 on the third main body portion side. ..

The third drawer frame side terminal portion 43 has a third drawer frame side thick wall portion 53 and a third drawer frame side thin wall portion 63. The third drawer frame side thin wall portion 63 is aligned with the third drawer frame side thick wall portion 53 along the first direction DR1 (X-axis direction). The dimension along the second direction DR2 (Y-axis direction) of the third drawer frame side thin wall portion 63 is smaller than the dimension along the second direction DR2 (Y-axis direction) of the third drawer frame side thick wall portion 53. ..

The third junction portion J3 sandwiches the thin-walled portion 33 on the third main body portion side along the second direction DR2 (Y-axis direction). The third junction portion J3 electrically connects the third main body portion side terminal portion 13 and the third drawer frame side terminal portion 43 by sandwiching each of the third main body portion side thin-walled portion 33 and the third drawer frame side thin-walled portion 63. Can be connected.

As shown in FIG. 5, the fourth main body side terminal portion 14 is arranged along the second direction DR2 (Y-axis direction) away from the third main body portion side terminal portion 13. The terminal portion 14 on the side of the fourth main body has a thick portion 24 on the side of the fourth main body and a thin portion 34 on the side of the fourth main body. The thin wall portion 34 on the side of the fourth main body is aligned with the thick portion 24 on the side of the fourth main body along the first direction DR1 (X-axis direction). The dimension along the second direction DR2 (Y-axis direction) of the fourth main body side thin wall portion 34 is smaller than the dimension along the second direction DR2 (Y-axis direction) of the fourth main body portion side thick wall portion 24. .. The fourth drawer frame side terminal portion 44 is arranged along the second direction DR2 (Y-axis direction) away from the third drawer frame side terminal portion 43.

The fourth drawer frame side terminal portion 44 has a fourth drawer frame side thick wall portion 54 and a fourth drawer frame side thin wall portion 64. The fourth drawer frame side thin-walled portion 64 is aligned with the fourth drawer frame-side thick-walled portion 54 along the first direction DR1 (X-axis direction). The dimension along the second direction DR2 (Y-axis direction) of the fourth drawer frame side thin wall portion 64 is smaller than the dimension along the second direction DR2 (Y-axis direction) of the fourth drawer frame side thick wall portion 54. ..

The fourth junction portion J4 sandwiches the fourth main body portion side thin-walled portion 34 along the second direction DR2 (Y-axis direction). The fourth junction portion J4 is arranged along the second direction DR2 (Y-axis direction) away from the third junction portion J3. The fourth junction portion J4 electrically connects the fourth main body portion side terminal portion 14 and the fourth drawer frame side terminal portion 44 by sandwiching each of the fourth main body portion side thin-walled portion 34 and the fourth drawer frame side thin-walled portion 64. Can be connected.

The current flowing into the main body B is separated at the third main body side terminal portion 13 and the fourth main body side terminal portion 14, and then merges at the outlet conductor Cout. Specifically, the current flowing into the main body portion B sequentially passes through the third main body portion side terminal portion 13, the third junction portion J3, and the third drawer frame side terminal portion 43, and flows to the outlet conductor Cout. Further, the current flowing into the main body portion B sequentially passes through the fourth main body portion side terminal portion 14, the fourth junction portion J4, and the fourth drawer frame side terminal portion 44, and flows to the outlet conductor Cout.

As shown in FIG. 7, the fourth main body side terminal portion 14 is arranged away from the first main body portion side terminal portion 11 along the fourth direction (Z-axis direction). The fourth drawer frame side terminal portion 44 is arranged away from the first drawer frame side terminal portion 41 along the fourth direction (Z-axis direction). The fourth junction portion J4 is arranged along the third direction DR3 (Z-axis direction) away from the first junction portion J1.

As shown in FIG. 8, the drawer type circuit breaker 100 according to the present embodiment is configured so that a three-phase current of R phase, S phase and T phase flows. The R-phase, S-phase, and T-phase currents have different phases from each other. Therefore, the drawer type circuit breaker 100 according to the present embodiment is a so-called three-phase circuit breaker.

The main body portion B includes an R phase main body portion BR, an S phase main body portion BS, and a T phase main body portion BT. The R-phase main body portion BR, the S-phase main body portion BS, and the T-phase main body portion BT are sequentially arranged along the second direction DR2 (Y-axis direction). The R-phase main body BR is configured so that an R-phase current flows. The S-phase main body BS is configured so that an S-phase current flows. The T-phase main body BT is configured so that a T-phase current flows.

The main body side terminal 1 includes an R phase main body side terminal portion 1R, an S phase main body portion side terminal portion 1S, and a T phase main body portion side terminal portion 1T. The terminal portion 1R on the R-phase main body portion side is connected to the R-phase main body portion BR. The S-phase main body side terminal portion 1S is connected to the S-phase main body portion BS. The T-phase main body side terminal portion 1T is connected to the T-phase main body portion BT.

The junction J includes an R-phase junction section JR, an S-phase junction section JS, and a T-phase junction section JT.

The drawer frame side terminal 4 includes an R phase drawer frame side terminal portion 4R, an S phase drawer frame side terminal portion 4S, and a T phase drawer frame side terminal portion 4T. The R-phase lead-out frame side terminal portion 4R is electrically connected to the R-phase main body portion-side terminal portion 1R by the R-phase junction portion JR. The S-phase lead-out frame side terminal portion 4S is electrically connected to the S-phase main body portion-side terminal portion 1S by the S-phase junction portion JS. The T-phase lead-out frame side terminal portion 4T is electrically connected to the T-phase main body portion-side terminal portion 1T by the T-phase junction portion JT.

The shortest R-phase distance along the first direction DR1 (X-axis direction) between the R-phase main body side terminal 1R and the R-phase extraction frame side terminal 4R, the T-phase main body side terminal 1T and the T-phase drawer frame side. The shortest T-phase distance along the first-direction DR1 (X-axis direction) with the terminal portion 4T and the first-direction DR1 (X-axis direction) between the S-phase main body side terminal portion 1S and the S-phase extraction frame side terminal portion 4S. Each of the shortest S-phase distances along the line may be the same.

In the present embodiment, the R phase portion is the R phase main body portion BR, the R phase main body portion side terminal portion 1R, the R phase junction portion JR, and the R phase drawer frame side terminal portion 4R. Further, the S phase portion is an S phase main body portion BS, an S phase main body portion side terminal portion 1S, an S phase junction portion JS, and an S phase lead-out frame side terminal portion 4S. The T-phase portion is a T-phase main body portion BT, a T-phase main body portion side terminal portion 1T, a T-phase junction portion JT, and a T-phase lead-out frame side terminal portion 4T.

FIG. 9 shows an example of an alternating current flowing through the drawer type circuit breaker 100. The effective value of the current flowing through the T-phase portion, the S-phase portion and the R-phase portion is 150 kA (power factor 0.15). As shown in FIG. 9, the maximum current flows in the T-phase portion. At 8 ms, a current of 344.7 kA flows in the T phase portion. At 8 ms, the current flowing through the T-phase portion is maximum. A current of -195.4 kA flows in the S phase portion at 8 ms. A current of -149.3 kA flows in the R phase portion at 8 ms. At 8 ms, the polarity of the current flowing in the S-phase portion and the R-phase portion is opposite to the polarity of the current flowing in the T-phase portion. Therefore, in 8 ms, the direction of the current flowing in the S phase portion and the R phase portion is opposite to the direction of the current flowing in the T phase portion. The above current is a short-circuit withstand current test current that simulates a short-circuit current at the time of an accident. The distance between the R phase portion and the S phase portion is a distance at which discharge does not occur. Further, the distance between the S phase portion and the T phase portion is a distance at which discharge does not occur.

Next, the force acting on the drawer type circuit breaker 100 according to the first embodiment will be described with reference to FIGS. 10 to 13.

The elastic force generated by the first spring portion 91 (see FIG. 3) and the second spring portion 92 (see FIG. 3) and the Lorentz force generated by the current flowing through the drawer type circuit breaker 100 act on the drawer type circuit breaker 100. .. As shown in FIGS. 10 to 13, the Lorentz force generated by the current flowing through the drawer type circuit breaker 100 is the following first Lorentz force F1, second Lorentz force F2, third Lorentz force F3 and fourth. It is classified as Lorentz force F4. In addition, in FIGS. 10 to 13, the current flow is illustrated by a alternate long and short dash line.

As shown in FIG. 10, the first Lorentz force F1 is a repulsive force generated by a current flowing at a contact point between the main body side terminal 1 and the junction J and a contact point between the drawer frame side terminal 4 and the junction J. .. The shape of the contact point is, for example, a circle having a radius of 1 mm or less. When a current flows from the junction J through the contact point to the main body side terminal 1, the direction of the current flowing from the periphery of the contact point at the junction J toward the contact point is the contact point at the main body side terminal 1 from the contact point. It is opposite to the direction of the current flowing toward the surroundings. Therefore, a repulsive force is generated around the contact point. Therefore, the first Lorentz force F1 acts in the direction of dissociating the junction J from the main body side terminal 1.

As shown in FIG. 11, the second Lorentz force F2 is an attractive force generated by the current flowing through each of the first finger 7 and the second finger 8. A current flows in each of the first finger 7 and the second finger 8 in the same direction along the first direction DR1 (X-axis direction). Therefore, a suction force is generated on the first finger 7 and the second finger 8. Therefore, the second Lorentz force F2 acts in the direction of pressing the first finger 7 and the second finger 8 of the junction J against the main body side terminal 1. The magnitude of the second Lorentz force F2 increases as the first finger 7 and the second finger 8 come closer to each other.

As shown in FIG. 12, the third Lorentz force F3 is an attractive force generated by the current flowing through each of the first junction portion J1 and the second junction portion J2. A current flows in each of the first junction portion J1 and the second junction portion J2 in the same direction along the first direction DR1 (X-axis direction). Therefore, a suction force is generated in the second finger 8 of the first junction portion J1 and the first finger 7 of the second junction portion J2. Therefore, a force acting in the direction away from the terminal portion 11 on the side of the first main body portion acts on the second finger 8 of the first junction portion J1, and the first finger 7 of the second junction portion J2 is on the side of the second main body portion. A force acting in the direction away from the terminal portion 12. Therefore, the third Lorentz force F3 acts in the direction of dissociating the junction J from the main body side terminal 1. The magnitude of the third Lorentz force F3 becomes smaller as the distance between the first junction portion J1 and the second junction portion J2 increases. The Lorentz force similar to that of the third Lorentz force F3 is generated in the third junction portion J3 and the fourth junction portion J4.

As shown in FIG. 13, the fourth Lorentz force F4 is the Lorentz force due to the current flowing through the R phase portion, the S phase portion, and the T phase portion. A three-phase alternating current flows through the drawer type circuit breaker 100 according to the present embodiment. Therefore, the polarities of the currents flowing in the adjacent phase portions may be opposite depending on the timing. When the polarities of the currents flowing in the adjacent phase portions are opposite to each other, a Lorentz force acting in a direction away from each other acts on the junction J of the first phase portion and the junction J of the second phase portion. Therefore, the fourth Lorentz force F4 may act in the direction of dissociating the junction J from the main body side terminal 1.

Mainly referring to FIGS. 8 and 9, the above-mentioned first Lorentz force F1, second Lorentz force F2, third Lorentz force F3 and fourth Lorentz force F4 are drawers according to the present embodiment. An example of acting on the breaker 100 will be described.

As shown in FIGS. 8, 9 and 13, in the T-phase portion, a positive current flows from the right side of the paper surface to the left side of the paper surface at 8 ms. In the S phase portion, a negative electrode current flows at 8 ms. Therefore, the polarities of the current flowing through the S-phase portion and the current flowing through the T-phase portion are opposite. Therefore, a fourth Lorentz force F4 acts on the T-phase junction portion JT and the S-phase junction portion JS in a direction away from each other. From the above, the first Lorentz force F1 (see FIG. 10), the third Lorentz force F3 (see FIG. 12), and the fourth Lorentz force F4 (see FIG. 12) along the direction in which the junction J deviates from the main body side terminal 1. 13) occurs. Further, a second Lorentz force F2 (see FIG. 12) is generated along the direction in which the junction J is pressed against the terminal 1 on the main body side. Further, along the direction in which the junction J is pressed against the main body side terminal 1 by the first spring portion 91 (see FIG. 3), the second spring portion 92 (see FIG. 3), and the frame portion 93 (see FIG. 3) of the junction J. Force is generated.

If the Lorentz force acting in the direction in which the junction J moves away from the main body side terminal 1 is larger than the force acting in the direction in which the junction J is pressed against the main body side terminal 1, the junction J deviates from the main body side terminal 1. do. Further, the Lorentz force causes the main body side terminal 1 and the drawer frame side terminal 4 to vibrate. When the main body side terminal 1 and the drawer frame side terminal 4 vibrate, an arc is generated between the main body side terminal 1 and the drawer frame side terminal 4 and the drawer type circuit breaker 100. Since the arc is at a high temperature, if the material of the junction J or the like is copper (Cu), the drawer type circuit breaker 100 may be damaged due to the melting of the junction or the like.

If the current flowing through the drawer type circuit breaker 100 is large, as shown in FIG. 14, the first direction DR1 (X-axis direction) and the second direction DR2 of the main body side terminal 1 and the drawer frame side terminal 4 are There is a possibility that the position in each (Y-axis direction) will shift. Specifically, when the current is as large as the short-circuit current at the time of an accident or the large current of the short-time withstand current test, the first direction DR1 (X-axis direction) and the first direction of the main body side terminal 1 and the drawer frame side terminal 4 The position in each of the two-way DR2 (Y-axis direction) may shift. The relative positions of the main body side terminal 1 and the drawer frame side terminal 4 may be displaced in a range of 1 mm or more and 9 mm or less along the first direction DR1 (X-axis direction), for example. Further, the main body side terminal 1 may move away from the drawer frame side terminal 4 in a range of 1 mm or more and 9 mm or less along the second direction DR2 (Y-axis direction), for example.

Next, the gap provided in the drawer type circuit breaker 100 will be described with reference to FIGS. 3 and 6.

Junction J moves along the first direction DR1 (X-axis direction) by Lorentz force. As shown in FIG. 3, the first shortest distance D1 along the first direction DR1 (X-axis direction) between the junction J and the thick portion 2 on the main body side is the maximum current of the short-time withstand current test at the junction J. Is larger than the maximum amount of increase in the distance along the first direction DR1 (X-axis direction) of the junction J when the current flows. The short-time withstand current test is a test based on the rated short-time withstand current specified in JIS standard C-8201-2-1 4.35.4.

The thin-walled portion 3 on the main body portion side has a tip portion E in the first direction DR1 (X-axis direction). The maximum current of the short-time withstand current test flows in the second shortest distance D2 along the first direction DR1 (X-axis direction) between the portion in contact with the thin-walled portion 3 on the main body side of the junction J and the tip portion E. It is larger than the sum of the maximum increase in the distance between the main body side terminal 1 and the drawer frame side terminal 4 along the first direction DR1 (X-axis direction) and the first shortest distance D1.

As shown in FIG. 6, the first main body side thin-walled portion 31 has a first end portion E1 and a first central side end portion E1b. The first end portion E1 is arranged away from the first junction portion J1. The first end portion E1 is arranged on the side opposite to the third main body portion side terminal portion 13 with respect to the first junction portion J1.

The third main body side thin-walled portion 33 has a third end portion E3 and a third central side end portion E3b. The third end portion E3 is arranged away from the third junction portion J3. The third end portion E3 is arranged on the side opposite to the first main body portion side terminal portion 11 with respect to the third junction portion J3.

Junction J moves along the third direction DR3 (Z-axis direction) by Lorentz force. The third shortest distance D3 along the third direction DR3 (Z-axis direction) between the first end portion E1 and the first junction portion J1 is the first junction portion J1 when the maximum current of the short-time withstand current test flows. It is larger than the first maximum displacement amount along the third direction DR3 (Z-axis direction) of. The fourth shortest distance D4 along the third direction DR3 (Z-axis direction) between the third end portion E3 and the third junction portion J3 is the third junction portion J3 when the maximum current of the short-time withstand current test flows. It is larger than the third maximum displacement amount along the third direction DR3 (Z-axis direction) of.

Further, the shortest distance between the first central side end portion E1b and the first junction portion J1 along the third direction DR3 (Z-axis direction) is smaller than the third shortest distance D3. Further, the shortest distance between the third central side end portion E3b and the third junction portion J3 along the third direction DR3 (Z-axis direction) is smaller than the fourth shortest distance D4.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the first embodiment, as shown in FIG. 1, the main body side first surface 1S1 and the main body side second surface 1S2 of the main body side thin wall portion 3 are flat. .. Therefore, when the first finger 7 and the second finger 8 of the junction J sandwich the first surface 1S1 on the main body side and the second surface 1S2 on the main body side along the second direction DR2 (Y-axis direction), the first one. It is not necessary to make the distance between the fingers 7 and the second finger 8 larger than that in the state where the thin-walled portion 3 on the main body side is sandwiched. Therefore, when the first finger 7 and the second finger 8 of the junction J sandwich the thin wall portion 3 on the main body portion side, the force can be reduced. Therefore, it is possible to suppress a decrease in detachability.

More specifically, when the main body side first surface 1S1 and the main body side second surface 1S2 include a recessed portion and a bulging portion, when the main body side terminal 1 is inserted into the junction J. In addition, it is necessary to increase the distance between the first finger 7 and the second finger 8 to the size of the bulging portion. Further, when the main body side terminal 1 is pulled out from the junction J, it is necessary to increase the distance between the first finger 7 and the second finger 8 from the dimension of the recessed portion to the dimension of the expanded portion. For this reason, a force is required when inserting and removing the junction J and the terminal 1 on the main body side, so that the detachability is lowered. According to the present embodiment, the main body side first surface 1S1 and the main body side second surface 1S2 of the main body side thin wall portion 3 are flat. As a result, it is not necessary to increase the distance between the first finger 7 and the second finger 8 as compared with the state in which the thin-walled portion 3 on the main body side is sandwiched, so that deterioration of the detachability can be suppressed.

As shown in FIG. 1, the dimension of the thin wall portion 3 on the main body side along the second direction DR2 (Y-axis direction) is along the second direction DR2 (Y-axis direction) of the thick wall portion 2 on the main body portion side. Smaller than the dimensions. Therefore, the distance between the first finger 7 and the second finger 8 can be made closer than in the case where the total thickness of the main body side terminal 1 is the same as the thickness of the main body side thick portion 2. Therefore, the Lorentz force (second Lorentz force F2) due to the current flowing through the first finger 7 and the second finger 8 can be increased. Since the current flowing through the first finger 7 is in the same direction as the current flowing through the second finger 8 along the first direction DR1 (X-axis direction), the first finger 7 and the second finger 8 are oriented toward each other. Suction power works. From the above, since the suction force acting on the first finger 7 and the second finger 8 can be increased, it is possible to suppress the first finger 7 and the second finger 8 from deviating from the main body side terminal 1. can.

This makes it possible to suppress the firing of the arc. Further, it is not necessary to increase the force of the first spring portion 91 and the second spring portion 92 for pressing the first finger 7 and the second finger 8 against the main body side terminal 1. As a result, it is possible to suppress the increase in size of the first spring portion 91 and the second spring portion 92, so that it is possible to suppress the increase in size of the junction J.

As shown in FIG. 1, the dimension of the thin wall portion 3 on the main body side along the second direction DR2 (Y-axis direction) is along the second direction DR2 (Y-axis direction) of the thick wall portion 2 on the main body portion side. Smaller than the dimensions. Therefore, even if the junction J moves along the first direction DR1 (X-axis direction) due to the Lorentz force, the movement stops when the junction J comes into contact with the thick portion. As a result, it is possible to prevent the junction J from coming off the main body side terminal 1 due to the movement of the junction J. Therefore, it is possible to suppress the decrease in the contact area between the junction J and the main body side terminal 1, and thus it is possible to suppress the increase in the contact resistance.

As shown in FIG. 1, the dimension of the thick portion 2 on the main body side along the first direction DR1 (X-axis direction) is along the first direction DR1 (X-axis direction) of the thin wall portion 3 on the main body side. Greater than the dimensions. Therefore, the surface area of the main body side terminal 1 can be increased as compared with the case where the length of the main body side thick portion 2 is shorter than the length of the main body side thin wall portion 3. Therefore, it is possible to suppress the deterioration of the heat dissipation property of the drawer type circuit breaker 100. Therefore, it is possible to suppress a decrease in the heat transport amount of the drawer type circuit breaker 100.

As shown in FIG. 3, the dimension along the second direction DR2 (Y-axis direction) of the main body side thin-walled portion 3 is the dimension along the second direction DR2 (Y-axis direction) of the drawer frame side terminal 4. It is 0.3 times or more and 1.0 times or less. The sum of the dimensions along the second direction DR2 (Y-axis direction) of the main body side thin wall portion 3 and the dimensions along the second direction DR2 (Y axis direction) with the main body portion side thick wall portion 2 is the drawer frame side. It is 1.5 times or more the dimension along the second direction DR2 (Y-axis direction) of the terminal 4. As will be described later in the examples, it is possible to suppress an increase in the resistance of the terminal 1 on the main body side and suppress a decrease in thermal conductance. Therefore, it is possible to suppress the temperature rise of the drawer type circuit breaker 100.

As shown in FIG. 3, the first shortest distance D1 along the first direction DR1 (X-axis direction) between the junction J and the thick portion 2 on the main body side is the maximum current of the short-time withstand current test at the junction J. Is larger than the maximum amount of increase in the distance along the first direction DR1 (X-axis direction) of the junction J when the current flows. Therefore, it is possible to prevent the junction J from coming into contact with the thick portion 2 on the main body side. If the junction J and the thick portion 2 on the main body side come into contact with each other, the contact and the dissociation may be repeated. This can cause an arc. Also, sparks may occur. According to the present embodiment, since it is possible to suppress the contact between the junction J and the thick portion 2 on the main body portion side, it is possible to suppress the occurrence of arcing and sparks.

As shown in FIG. 3, the first shortest distance D1 along the first direction DR1 (X-axis direction) between the junction J and the thick portion 2 on the main body side is the maximum current of the short-time withstand current test at the junction J. Is larger than the maximum amount of increase in the distance along the first direction DR1 (X-axis direction) of the junction J when the current flows. Therefore, it is possible to prevent the junction J from coming into contact with the thick portion 2 on the main body side. As a result, it is possible to prevent the first spring portion 91 and the second spring portion 92 of the junction J from coming into contact with the thick portion 2 on the main body portion side. Therefore, it is possible to prevent the contact pressure with the first finger 7 and the second finger 8 from being lowered due to the displacement of the first spring portion 91 and the second spring portion 92.

As shown in FIG. 3, the second shortest distance D2 along the first direction DR1 (X-axis direction) between the portion in contact with the thin-walled portion 3 on the main body side of the junction J and the tip portion E is short. From the sum of the maximum increase in the distance between the main body side terminal 1 and the drawer frame side terminal 4 along the first direction DR1 (X-axis direction) and the first shortest distance D1 when the maximum current of the withstand current test flows. Is also big. Therefore, even when the junction J moves along the first direction DR1 (X-axis direction), it is possible to prevent the junction J from coming off the main body side terminal 1. The main body portion B is drawn out from the drawer frame F along the direction from the drawer frame side terminal 4 in the first direction DR1 (X-axis direction) toward the main body portion side terminal 1. Therefore, the main body portion B has a drawer frame side terminal 4 in the first direction DR1 (X-axis direction) rather than a direction from the main body portion side terminal 1 in the first direction DR1 (X-axis direction) toward the drawer frame side terminal 4. It is easy to move along the direction toward the terminal 1 on the main body side.

As shown in FIG. 3, the dimension along the second direction DR2 (Y-axis direction) of the thin wall portion 31 on the first main body portion side is the second direction DR2 (Y-axis direction) of the thick wall portion 21 on the first main body portion side. ) Is smaller than the dimensions. The dimension of the thin wall portion 32 on the second main body side along the second direction DR2 (Y-axis direction) is smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick wall portion 22 on the second main body portion side. .. Therefore, the second finger 8 of the first junction portion J1 and the first finger of the second junction portion J2 are more than the case where the thickness of the terminal portion 11 on the first main body portion side and the terminal portion 12 on the second main body portion side is uniform. The distance from 7 can be increased. The repulsive Lorentz force (third Lorentz force F3) acting on the second finger 8 of the first junction portion J1 and the first finger 7 of the second junction portion J2 can be reduced. Therefore, it is possible to prevent the second finger 8 of the first junction portion J1 from deviating from the terminal portion 11 on the first main body portion side. Further, it is possible to prevent the first finger 7 of the second junction portion J2 from deviating from the terminal portion 12 on the second main body portion side. From the above, it is possible to prevent the junction J from deviating from the terminal 1 on the main body side.

As shown in FIG. 4, the junction J includes a first junction portion J1 and a second junction portion J2. Therefore, the current flowing through the junction J is diverted. Therefore, the current flowing through one of the plurality of junctions can be made smaller than when the junction J is single.

As shown in FIG. 6, the maximum current of the short-time withstand current test flows in the third shortest distance D3 along the third direction DR3 (Z-axis direction) between the first end portion E1 and the first junction portion J1. It is larger than the first maximum displacement amount along the third direction DR3 (Z-axis direction) of the first junction portion J1 at the time. The fourth shortest distance D4 along the third direction DR3 (Z-axis direction) between the third end portion E3 and the third junction portion J3 is the third junction portion J3 when the maximum current of the short-time withstand current test flows. It is larger than the third maximum displacement amount along the third direction DR3 (Z-axis direction) of. Therefore, even when the junction J moves along the third direction DR3 (Z-axis direction), it is possible to prevent the junction J from coming off the main body side terminal 1.

As a result, the current is shunted to all the junctions among the plurality of junctions, so that it is possible to suppress the current from concentrating on one of the plurality of junctions. Therefore, the junction J is less likely to float from the terminal 1 on the main body side. Therefore, it is possible to suppress the occurrence of arcing.

Subsequently, the operation and effect of the present embodiment will be described using the analysis results of the drawer type circuit breaker 100 of the present embodiment and the drawer type circuit breaker according to the first comparative example by electromagnetic field analysis.

The electromagnetic field analysis is an analysis considering the eddy current by the electromagnetic field analysis software JMAG. In order to calculate the electromagnetic force acting on the junction J and the conductor, in the analysis model, a drawer type circuit breaker 100 for flowing the three-phase alternating current shown in FIG. 9 was used. Also, the inside of the circuit breaker 100 body was simulated by a simplified simple conductor.

The current was the current of the three-phase short-time withstand current test shown in FIG. Specifically, the effective value of the current was 150 kmarms.

By electromagnetic field analysis, the resultant force of the above-mentioned first to fourth Lorentz forces is calculated. If the direction of the resultant force is in the direction of pulling the finger apart and the magnitude of the resultant force is larger than the contact pressure by the spring, the finger is lifted. That is, when the Lorentz force acting in the direction of pulling the finger away from the terminal conductor exceeds the force of pressing the finger of the spring against the terminal conductor, the finger deviates from the terminal 1 on the main body side.

In the drawer type circuit breaker 100 according to the present embodiment, the thickness of the thin portion was 9 mm. The thickness of the thick portion was 15 mm. The thin-walled portion is a thin-walled portion 3 on the main body side and a thin-walled portion 6 on the drawer frame side. Further, the thick portion is a thick portion 2 on the main body side and a thick portion 5 on the drawer frame side. The number of the first finger portion and the second finger portion was 36 in total. The electromagnetic field analysis of the drawer type circuit breaker 100 of this embodiment was carried out up to 15 ms.

In the first comparative example, the main body side terminal 1 and the drawer frame side terminal 4 had a uniform thickness. The thickness of the main body side terminal 1 and the drawer frame side terminal 4 was 15 mm. The number of the first finger portion and the second finger portion was 36 in total. The electromagnetic field analysis of the first comparative example was carried out up to 11 ms due to the limitation of the memory capacity.

FIG. 15 is a graph showing the time change of the number of contacts in the short-time withstand current test calculated by electromagnetic field analysis. The number of contacts is the first finger portion and the second finger portion of the first finger 7 and the third finger portion and the fourth finger portion of the second finger 8 that are in contact with the main body side terminal 1 and the drawer frame side terminal 4. Is the number of. In order to make the figure easier to see, in FIG. 15, when the number of contacts of the first embodiment and the number of contacts of the first comparative example are the same, a symbol indicating the number of contacts of the first comparative example is shown and carried out. The symbol indicating the number of contacts of Form 1 is not shown.

According to the comparison between the electromagnetic field analysis and the experiment, if the number of contacts is more than 18, the arc will not occur. According to FIG. 15, in the first comparative example, since the number of contacts continues to be 18 after 6 ms, there is a possibility of firing. In the present embodiment, since the state where the number of contacts is 27 or more is maintained, the firing is suppressed. Therefore, according to the present embodiment, it is possible to prevent the finger from deviating from the terminal conductor.

The temperature of the drawer type circuit breaker 100 needs to be suppressed to the specified temperature or less in the temperature rise test against the rated current. However, if the thin portion is provided without changing the thickness of the thick portion, the heat conduction of the drawer type circuit breaker 100 is lowered, so that the heat transport amount is reduced. In the present embodiment, the heat transport amount increases as the thickness of the thick portion increases, so that the decrease in the heat transport amount due to the thin wall portion is compensated.

FIG. 16 is a graph showing the result of calculating the suction force acting between the first finger 7 and the second finger 8 when the thickness of the thin portion is fixed at 9 mm and the thickness of the thick portion is increased from 9 mm. Is. In the analysis model, one first finger 7 and one second finger 8 of one junction J were analyzed for the sake of simplicity of analysis. Specifically, the sum of the suction forces due to the first Lorentz force F1 and the second Lorentz force F2 described above was calculated. Even when the thickness of the thick portion increased, the suction force did not decrease. Therefore, by increasing the thickness of the thick portion, it is possible to compensate for the decrease in the heat transport amount due to the thin portion.

Embodiment 2.
Next, the configuration of the drawer type circuit breaker 100 according to the second embodiment will be described with reference to FIG. Unless otherwise specified, the second embodiment has the same configuration and operation and effect as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 17, the main body side terminal 1 according to the present embodiment includes the main body side terminal 1 including the main body side stage portion 10. The main body side step portion 10 is arranged between the main body side thick wall portion 2 and the main body portion side thin wall portion 3 along the first direction DR1 (X-axis direction). The first finger 7 and the second finger 8 sandwich the main body side step portion 10 at intervals along the second direction DR2 (Y-axis direction). The dimension of the main body side step portion 10 along the second direction DR2 (Y-axis direction) is larger than the dimension of the main body portion side thin wall portion 3 along the second direction DR2 (Y-axis direction) and the thickness of the main body portion side. It is smaller than the dimension along the second direction DR2 (Y-axis direction) of the meat portion 2.

The shortest distance between the junction J along the first direction DR1 (X-axis direction) and the main body side step portion 10 is the junction J along the first direction DR1 (X-axis direction) and the main body side thick portion 2. Less than the shortest distance of. It is desirable that the shortest distance between the junction J along the first direction DR1 (X-axis direction) and the main body side step portion 10 is the sum of the component manufacturing tolerance and the assembly tolerance. It is desirable that the shortest distance between the junction J along the first direction DR1 (X-axis direction) and the thick portion 2 on the main body side is larger than the sum of the component manufacturing tolerance and the assembly tolerance. It is desirable that the shortest distance between the junction J along the first direction DR1 (X-axis direction) and the tip end E of the main body side terminal 1 is equal to or greater than the sum of the component manufacturing tolerance, the assembly tolerance, and the maximum displacement amount.

The drawer frame side terminal 4 includes a drawer frame side step portion 40. The drawer frame side step portion 40 is arranged between the drawer frame side thick wall portion 5 and the drawer frame side thin wall portion 6 along the first direction DR1 (X-axis direction). The first finger 7 and the second finger 8 sandwich the drawer frame side step portion 40 at intervals along the second direction DR2 (Y-axis direction). The dimension along the second direction DR2 (Y-axis direction) of the step portion is larger than the dimension along the second direction DR2 (Y-axis direction) of the drawer frame side thin wall portion 6, and the drawer frame side thick wall portion 5 It is smaller than the dimension along the second direction DR2 (Y-axis direction). The relationship between the shortest distance between the junction J and the drawer frame side step portion 40 is the same as the relationship between the minimum distance between the junction J and the main body portion side step portion 10.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the second embodiment, as shown in FIG. 17, the dimension of the main body side step portion 10 along the second direction DR2 (Y-axis direction) is the main body side thin wall portion. It is larger than the dimension along the second direction DR2 (Y-axis direction) of 3 and smaller than the dimension along the second direction DR2 (Y-axis direction) of the thick portion 2 on the main body side. Therefore, the surface area of the main body side terminal 1 is larger than that in the case where the main body side thin wall portion 3 is directly connected to the main body portion side thick wall portion 2. Therefore, the thermal resistance of the terminal 1 on the main body side can be reduced. Therefore, it is possible to suppress the temperature rise of the main body side terminal 1 due to the current.

The shortest distance between the junction J along the first direction DR1 (X-axis direction) and the main body side step portion 10 is the junction J along the first direction DR1 (X-axis direction) and the main body side thick portion 2. Less than the shortest distance of. Therefore, when the junction J moves along the first direction DR1 (X-axis direction), the junction J and the main body side step portion 10 come into contact with each other before the junction J and the main body side thick portion 2 come into contact with each other. The contact causes the movement of the junction J to be suppressed. As a result, the deviation of the junction J can be reduced. Therefore, it is possible to suppress the occurrence of an arc between the junction J and the terminal 1 on the main body side, so that the reliability of the drawer type circuit breaker 100 can be improved.

Further, as a result, the first spring portion 91 and the second spring portion 92 of the junction J come into contact with the thick portion 2 on the main body side, so that each of the first spring portion 91 and the second spring portion 92 is the first finger 7. And it is possible to suppress the detachment from each of the second finger 8.

Embodiment 3.
Next, the configuration of the drawer type circuit breaker 100 according to the third embodiment will be described with reference to FIGS. 18 to 20. Unless otherwise specified, the third embodiment has the same configuration and operation and effect as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 18, the main body side terminal 1 according to the present embodiment includes the main body side stopper portion 10S. The main body side stopper portion 10S is arranged along the main body portion side thick wall portion 2 to the main body portion side thin wall portion 3. The dimension of the stopper portion 10S on the main body side along the second direction DR2 (Y-axis direction) is larger than the thin wall portion 3 on the main body portion side and smaller than the thick wall portion 2 on the main body portion side.

The drawer frame side terminal 4 according to the present embodiment includes a drawer frame side stopper portion 40S. The drawer frame side stopper portion 40S is arranged from the drawer frame side thick portion 5 to the drawer frame side thin wall portion 6. The dimension of the drawer frame side stopper portion 40S along the second direction DR2 (Y-axis direction) is larger than the drawer frame side thin wall portion 6 and smaller than the drawer frame side thick wall portion 5.

As shown in FIG. 19, the first finger 7 includes a first finger portion 7a and a second finger portion 7b. The first finger 7 includes, for example, six first finger portions 7a and three second finger portions 7b. FIG. 19 is a cross-sectional view taken along the line XIX-XIX of FIG. For convenience of explanation, the first spring portion 91 and the second spring portion 92 are not shown in FIG. Further, for convenience of explanation, the balance of the top, bottom, left, and right of FIG. 19 is not consistent with that of FIG.

The first finger portion 7a and the second finger portion 7b sandwich the main body portion side stopper portion 10S along the thickness direction (third direction DR3 (Z-axis direction)) of the main body portion side thin-walled portion 3. The main body side stopper portion 10S is in surface contact with the first finger portion 7a and the second finger portion 7b.

As shown in FIG. 20, the second finger 8 includes the third finger portion 8a and the fourth finger portion 8b. The second finger 8 includes, for example, six third finger portions 8a and three fourth finger portions 8b. The third finger portion 8a and the fourth finger portion 8b sandwich the stopper portion 10S on the main body portion side along the thickness direction (third direction DR3 (Z-axis direction)) of the thin wall portion 3 on the main body portion side. The main body side stopper portion 10S is in surface contact with the third finger portion 8a and the fourth finger portion 8b. FIG. 20 is a cross-sectional view taken along the line XX-XX of FIG. For convenience of explanation, the first spring portion 91 and the second spring portion 92 are not shown in FIG. 20. Further, for convenience of explanation, the balance of the top, bottom, left, and right of FIG. 20 is not consistent with that of FIG.

The first finger portion 7a and the second finger portion 7b sandwich the drawer frame side stopper portion 40S along the thickness direction (third direction DR3 (Z-axis direction)) of the drawer frame side thin-walled portion 6. The drawer frame side stopper portion 40S is in surface contact with the first finger portion 7a and the second finger portion 7b. The third finger portion 8a and the fourth finger portion 8b sandwich the drawer frame side stopper portion 40S along the thickness direction (third direction DR3 (Z-axis direction)) of the drawer frame side thin wall portion 6. The drawer frame side stopper portion 40S is in surface contact with the third finger portion 8a and the fourth finger portion 8b.

The direction of the current flowing through the first finger portion 7a of the first finger 7 is the same as the direction of the current flowing through the second finger portion 7b. Therefore, a Lorentz force that attracts each other is generated between the first finger portion 7a and the second finger portion 7b. As a result, the first finger 7 is pressed against the stopper portion 10S on the main body portion side. Further, the third finger portion 8a and the fourth finger portion 8b of the second finger 8 are also pressed against the main body portion side stopper portion 10S in the same manner as the first finger 7.

Lorentz force acting in the Y-axis direction and Lorentz force acting in the Z-axis direction are generated in the junction J. Specifically, the current flowing in the first junction portion J1 flows in the opposite direction to the current flowing in the third junction portion J3 along the first direction DR1 (X-axis direction), so that the current flows in the first junction portion J1. , The Lorentz force upward in the Z-axis direction acts. Further, a Lorentz force downward in the Z-axis direction acts on the third junction portion J3.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the present embodiment, as shown in FIGS. 18 to 20, in the first finger portion 7a and the second finger portion 7b, the main body portion side stopper portion 10S is thinned on the main body portion side. It is sandwiched along the thickness direction of the portion 3 (third direction DR3 (Z-axis direction)). The third finger portion 8a and the fourth finger portion 8b sandwich the stopper portion 10S on the main body portion side along the thickness direction (third direction DR3 (Z-axis direction)) of the thin wall portion 3 on the main body portion side. Therefore, it is possible to prevent the junction J from moving along the Z-axis direction. Therefore, it is possible to prevent the junction J from coming off from the main body side terminal 1 and the drawer frame side terminal 4.

As shown in FIGS. 18 to 20, in the first finger portion 7a and the second finger portion 7b, the main body portion side stopper portion 10S is used in the thickness direction of the main body portion side thin-walled portion 3 (third direction DR3 (Z-axis direction)). ) Is sandwiched. The third finger portion 8a and the fourth finger portion 8b sandwich the stopper portion 10S on the main body portion side along the thickness direction (third direction DR3 (Z-axis direction)) of the thin wall portion 3 on the main body portion side. Since the Lorentz force along the third direction DR3 (Z-axis direction) acts on the first to fourth finger portions, the junction J is pressed against the main body side terminal 1 along the third direction DR3 (Z-axis direction). Be done. Therefore, when the junction J tries to move along the second direction DR2 (Y-axis direction), a frictional force is generated between the junction J and the main body side stopper portion 10S. As a result, it is possible to prevent the junction J from moving with respect to the stopper portion 10S on the main body portion side.

As shown in FIG. 18, the dimension of the main body side stopper portion 10S along the second direction DR2 (Y-axis direction) is larger than the main body side thin wall portion 3 and smaller than the main body side thick wall portion 2. .. Therefore, the cross-sectional area of the terminal 1 on the main body side becomes large. Therefore, the amount of heat transported by the terminal 1 on the main body side increases. Therefore, it is possible to suppress the temperature rise of the terminal 1 on the main body side.

Embodiment 4.
Next, the configuration of the drawer type circuit breaker 100 according to the fourth embodiment will be described with reference to FIGS. 21 and 22. Unless otherwise specified, the fourth embodiment has the same configuration and operation and effect as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIGS. 21 and 22, the first main body side thin-walled portion 31 according to the present embodiment is the second main body in the second direction DR2 (Y-axis direction) of the first main body side thick-walled portion 21. It is arranged on the side opposite to the thin wall portion 32 on the side of the second main body with respect to the center of the terminal portion 12 on the portion side. In the present embodiment, the thin wall portion 31 on the first main body side is the end of the thick wall portion 21 on the first main body side opposite to the terminal portion 12 on the second main body side in the second direction DR2 (Y-axis direction). It protrudes from the part.

The second main body side thin-walled portion 32 is the first main body side thin-walled portion with respect to the center of the first main body portion-side terminal portion 11 in the second direction DR2 (Y-axis direction) of the second main body portion side thick-walled portion 22. It is arranged on the opposite side of 31. In the present embodiment, the second main body side thin-walled portion 32 is the end of the second main body side thick-walled portion 22 opposite to the first main body side terminal portion 11 in the second direction DR2 (Y-axis direction). It protrudes from the part.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the fourth embodiment, as shown in FIG. 22, the thin-walled portion 31 on the first main body portion side is the second-direction DR2 (Y-axis) of the thick-walled portion 21 on the first main body portion side. (Direction), it is arranged on the side opposite to the thin wall portion 32 on the second main body portion side with respect to the center of the terminal portion 12 on the second main body portion side. The second main body side thin-walled portion 32 is the first main body side thin-walled portion with respect to the center of the first main body portion-side terminal portion 11 in the second direction DR2 (Y-axis direction) of the second main body portion side thick-walled portion 22. It is arranged on the opposite side of 31. Therefore, the second finger 8 and the second finger 8 of the first junction portion J1 are arranged more than when the thin wall portion 3 on the main body portion side is arranged at the center in the second direction DR2 (Y-axis direction) of the thick wall portion 2 on the main body portion side. 2 The distance of the junction portion J2 from the first finger 7 can be increased. Therefore, the suction force acting on the second finger 8 of the first junction portion J1 and the first finger 7 of the second junction portion J2 can be reduced. As a result, it is possible to prevent the second finger 8 of the first junction portion J1 from diverging from the terminal portion 11 on the first main body portion side, and the first finger 7 of the second junction portion J2 is the terminal on the second main body portion side. It is possible to suppress the deviation from the part 12. Therefore, it is possible to prevent the junction J from deviating from the terminal 1 on the main body side.

Thereby, it is possible to prevent the junction J from deviating from the main body side terminal 1 without changing the dimension of the main body side terminal 1 along the first direction DR1 (X-axis direction). If the dimension of the main body side terminal 1 along the first direction DR1 (X-axis direction) becomes large, the distance between adjacent phases becomes short, so that the fourth Lorentz force F4 becomes large. As a result, the junction J tends to deviate from the terminal 1 on the main body side, so that there arises a problem that the vibration of the drawer type circuit breaker 100 becomes large.

Embodiment 5.
Next, the configuration of the drawer type circuit breaker 100 according to the fifth embodiment will be described with reference to FIG. 23. Unless otherwise specified, the fifth embodiment has the same configuration and operation and effect as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 23, the R-phase shortest distance DR and the T-phase main body side along the first direction DR1 (X-axis direction) of the R-phase main body side terminal portion 1R and the R-phase lead-out frame side terminal portion 4R. Each of the T-phase shortest distance DTs along the first direction DR1 (X-axis direction) of the terminal portion 1T and the T-phase drawer frame side terminal portion 4T is the S-phase main body side terminal portion 1S and the S-phase drawer frame side terminal. It is shorter than the S-phase shortest distance DS along the first direction DR1 (X-axis direction) with the unit 4S. The S-phase shortest distance DS is the shortest distance along the first direction DR1 (X-axis direction) between the S-phase main body side terminal portion 1S and the S-phase lead-out frame side terminal portion 4S. The T-phase shortest distance DT is the shortest distance along the first direction DR1 (X-axis direction) between the T-phase main body side terminal portion 1T and the T-phase lead-out frame side terminal portion 4T.

The dimensions along the first direction DR1 (X-axis direction) of each of the R phase main body side thin wall portion 3R and the T phase main body side thin wall portion 3T are the first direction DR1 (X) of the S phase main body side thin wall portion 3S. Longer than the dimension along the axial direction). The distance between the junction J and the thick portion 2 on the main body side may be the same in each of the R phase portion, the S phase portion, and the T phase portion. The R-phase shortest distance DR is the shortest distance along the first direction DR1 (X-axis direction) between the R-phase main body side terminal portion 1R and the R-phase lead-out frame side terminal portion 4R.

Current flows in each of the R phase main body BR, the S phase main body BS, and the T phase main body BT in the same direction along the third direction DR3 (Z-axis direction). A magnetic flux is generated in each of the R phase main body BR, the S phase main body BS, and the T phase main body BT due to the current flowing through each of the R phase main body BR, the S phase main body BS, and the T phase main body BT. Due to the Lorentz force of the magnetic flux generated in each of the R phase main body BR, the S phase main body BS and the T phase main body BT, each of the R phase main body BR, the S phase main body BS and the T phase main body BT is the first. There is a possibility of moving in the direction DR1 (X-axis direction). Each of the R-phase main body BR, the S-phase main body BS, and the T-phase main body BT may move away from the junction J along the first direction DR1 (X-axis direction). Since the magnitudes of the currents flowing through the R phase main body BR, the S phase main body BS, and the T phase main body BT are different, each of the R phase main body BR, the S phase main body BS, and the T phase main body BT. The amount of movement of is also different. The amount of movement of the R-phase main body BR and the S-phase main body BS arranged at the end of the main body B tends to be larger than the amount of movement of the T-phase main body BT arranged in the center of the main body. Therefore, if the R-phase shortest distance DR, the S-phase shortest distance DS, and the T-phase shortest distance DT are the same, each of the R-phase main body side terminal portion 1R and the T-phase main body side terminal portion 1T and the junction J The contact area of the S phase main body side terminal portion 1S tends to be smaller than the contact area of the junction J.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the fifth embodiment, as shown in FIG. 23, each of the R phase shortest distance DR and the T phase shortest distance DT is shorter than the S phase shortest distance DS. According to the present embodiment, each of the R phase shortest distance DR and the T phase shortest distance DT is shorter than the S phase shortest distance DS. Therefore, even when the R-phase main body BR and the T-phase main body BT move, the contact area between each of the R-phase main body side terminal 1R and the T-phase main body side terminal 1T and the junction J remains. It can be suppressed from becoming smaller. As a result, it is possible to prevent the junction J from deviating from the terminal 1 on the main body side, and thus it is possible to suppress the occurrence of an arc.

Embodiment 6.
Next, the configuration of the drawer type circuit breaker 100 according to the sixth embodiment will be described with reference to FIGS. 24 and 25. Unless otherwise specified, the sixth embodiment has the same configuration and operation and effect as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 24, the first finger 7 according to the present embodiment includes a first connecting portion 71 and a first protruding portion 72. For convenience of explanation, the frame portion 93 is not shown in FIG. 24. The first connection portion 71 electrically connects the thin-walled portion 3 on the main body portion side and the terminal 4 on the drawer frame side. The first protruding portion 72 is connected to the first connecting portion 71 between the thin-walled portion 3 on the main body side and the terminal 4 on the drawer frame side. The first protrusion 72 extends toward the second finger 8 along the second direction DR2 (Y-axis direction).

The second finger 8 includes a second connecting portion 81 and a second protruding portion 82. The second connection portion 81 electrically connects the thin-walled portion 3 on the main body portion side and the terminal 4 on the drawer frame side. The second protruding portion 82 is connected to the second connecting portion 81 between the thin-walled portion 3 on the main body side and the terminal 4 on the drawer frame side. The second protrusion 82 extends toward the first finger 7 along the second direction DR2 (Y-axis direction). The second protruding portion 82 of the second finger 8 is the first protruding portion of the first finger 7 along the directions orthogonal to each of the first direction DR1 (X-axis direction) and the second direction DR2 (Y-axis direction). It overlaps with 72.

As shown in FIG. 25, along the directions (third direction DR3 (Z-axis direction), Z-axis direction) orthogonal to each of the first direction DR1 (X-axis direction) and the second direction DR2 (Y-axis direction). The size of the first protruding portion 72 is smaller than the size of the first connecting portion 71 along the orthogonal direction. The dimension of the first protrusion 72 along the third direction DR3 (Z-axis direction) is, for example, half of the dimension of the first connection portion 71 along the third direction DR3 (Z-axis direction). FIG. 25 is a cross-sectional view taken along the line XXV-XXV of FIG. 24. For convenience of explanation, the main body side terminal 1, the first spring portion 91, and the second spring portion 92 are not shown in FIG. 25.

The dimensions of the second protrusion 82 along the directions (third direction DR3 (Z-axis direction)) orthogonal to each of the first direction DR1 (X-axis direction) and the second direction DR2 (Y-axis direction) are orthogonal to each other. It is smaller than the dimension of the second connecting portion 81 along the direction (third direction DR3 (Z-axis direction)). The dimension of the second protrusion 82 along the third direction DR3 (Z-axis direction) is, for example, half the dimension of the second connecting portion 81 along the third direction DR3 (Z-axis direction).

Each of the first protruding portion 72 and the second protruding portion 82 is provided with a through hole TH. The junction J according to the present embodiment includes a support member SM. The support member SM penetrates the through hole TH. The first finger 7 and the second finger 8 which are overlapped with each other are supported by the support member SM. The inner diameter of the through hole TH is larger than the outer diameter of the support member SM.

The first finger 7 is fitted to the second finger 8 by superimposing the first protrusion 72 on the second protrusion 82 along the orthogonal direction, but the support member SM allows the first finger 7 and the second finger 7 to be fitted to the second finger 8. If the finger 8 is supported, the first finger 7 may not be fitted to the second finger 8.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type breaker 100 according to the sixth embodiment, as shown in FIG. 24, the second protruding portion 82 of the second finger 8 is the first direction DR1 (X-axis direction) and the second direction DR2 (the second direction DR2 (X-axis direction). It overlaps the first protruding portion 72 of the first finger 7 along a direction (third direction DR3 (Z-axis direction)) orthogonal to each of the Y-axis directions. Therefore, the distance between the current flowing through the first finger 7 and the current flowing through the second finger 8 is closer than when the first finger 7 and the second finger 8 do not overlap. Therefore, the Lorentz force attracted to each other generated by the first finger 7 and the second finger 8 becomes large. Therefore, it is possible to prevent the first finger 7 and the second finger 8 from deviating from the main body side terminal 1.

Next, the action and effect of the drawer type circuit breaker 100 according to the sixth embodiment will be described using the analysis results shown in FIGS. 26 to 28.

The Lorentz force acting on the drawer type circuit breaker 100 was analyzed by the electromagnetic field analysis software JMAG. This analysis was an analysis that took eddy currents into consideration. The Lorentz force generated in the first finger 7 (see FIG. 24) provided with the protrusion according to the present embodiment was calculated. In addition, the Lorentz force generated in the first finger 7 and the second finger 8 (see FIG. 1) in which the protrusion is not provided was calculated. The effective value of the current flowing through the junction J was 150 kHz. The arrows in FIGS. 26 and 27 indicate the current density vector. In the junction J according to the present embodiment, since the current flows through the first protruding portion 72, the distance from the current flowing through the second finger 8 is short. Therefore, the Lorentz force attracting each other was large. The current densities at the contact portion between the junction J and the thin wall portion 3 on the main body side and the contact portion between the junction J and the thin wall portion 6 on the drawer frame side were higher than those at other portions. As shown in FIG. 28, the Lorentz force generated in the junction J according to the present embodiment was 1.2 times larger than the Lorentz force generated in the junction J having no protrusion.

Embodiment 7.
Next, the configuration of the drawer type circuit breaker according to the seventh embodiment will be described with reference to FIGS. 29 and 30. Unless otherwise specified, the seventh embodiment has the same configuration and operation and effect as those of the sixth embodiment. Therefore, the same components as those in the sixth embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIGS. 29 and 30, in the drawer type circuit breaker 100 according to the present embodiment, the first protrusion 72 is overlapped with the second protrusion 82 along the direction orthogonal to the first finger 7. Is fitted to the second finger 8. The drawer type circuit breaker 100 does not include a support member SM (see FIG. 24). For convenience of explanation, the frame portion 93 is not shown in FIG. 29. FIG. 30 is a cross-sectional view taken along the line XXX-XXX of FIG. 29. For convenience of explanation, the main body side terminal 1, the first spring portion 91, and the second spring portion 92 are not shown in FIG. 30.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the seventh embodiment, as shown in FIG. 30, the first finger 7 is overlapped with the second protrusion 82 along the direction orthogonal to the first protrusion 72. It is fitted to the second finger 8. Therefore, even when the support member SM (see FIG. 24) is not included, it is possible to suppress the movement of the first finger 7 and the second finger 8.

As a result, it is not necessary to provide the through hole TH (see FIG. 24) in the junction J, so that the processing of the junction J can be simplified.

Embodiment 8.
Next, the configuration of the drawer type circuit breaker 100 according to the eighth embodiment will be described with reference to FIG. 31. Unless otherwise specified, the eighth embodiment has the same configuration and operation and effect as those of the seventh embodiment. Therefore, the same components as those in the seventh embodiment are designated by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 31, in the drawer type circuit breaker 100 according to the present embodiment, the first spring portion 91 is the first connection portion on the opposite side of the first connection portion 71 from the second connection portion 81. It is attached to 71. The second spring portion 92 is attached to the second connection portion 81 on the side opposite to the first connection portion 71 with respect to the second connection portion 81. For convenience of explanation, the frame portion 93 is not shown in FIG. 31.

The first connection portion 71 is provided with a first recess 73. The first recess 73 is recessed toward the second connection portion 81 along the second direction DR2 (Y-axis direction). The second connection portion 81 is provided with a second recess 83. The second recess 83 is recessed toward the first connection portion 71 along the second direction DR2 (Y-axis direction). The first spring portion 91 is configured to be deformable along the first recess 73. The first spring portion 91 does not come into contact with the first recess 73. The second spring portion 92 is configured to be deformable along the second recess 83. The second spring portion 92 does not come into contact with the second recess 83.

Subsequently, the action and effect of the present embodiment will be described.
According to the drawer type circuit breaker 100 according to the eighth embodiment, as shown in FIG. 30, the first spring portion 91 is configured to be deformable along the first recess 73 of the first finger 7. The second spring portion 92 is configured to be deformable along the second recess 83 of the second finger 8. Therefore, the first spring portion 91 and the second spring portion 92 can be deformed more than when the first finger 7 and the second finger 8 have a linear shape (see FIG. 3). Therefore, the force for pressing the junction J against the main body side terminal 1 can be increased without increasing the spring constant.

Next, using the examples and the second comparative example, the influence of the thickness of the thin wall portion 3 on the main body portion side and the thick wall portion 2 on the main body portion side on the resistance and heat conduction of the terminal will be described.

The drawer type circuit breaker 100 in the embodiment is the drawer type circuit breaker 100 according to the first embodiment (see FIG. 1). The standard for the terminal thickness of the terminal 1 on the main body side (dimensions along the second direction DR2 (Y-axis direction)) was the thickness of the terminal 4 on the drawer frame side of 15 mm.

The width (dimensions along the third direction DR3 (Z-axis direction)) of the main body side terminal 1 and the drawer frame side terminal 4 was 50 mm. The length of the main body side terminal 1 and the drawer frame side terminal 4 (dimensions along the first direction DR1 (X-axis direction)) was 40 mm. When connected to the junction J, no current flowed 3 mm from the ends of the main body side terminal 1 and the drawer frame side terminal 4. Therefore, the length of the portion where the current flows in the main body side terminal 1 and the drawer frame side terminal 4 is 37 mm. Further, the length of the thick portion 2 on the main body side and the thick portion 5 on the drawer frame side was 25 mm. Therefore, the length of the portion where the current flows in the thin-walled portion 3 on the main body side and the thin-walled portion 6 on the drawer frame side is 12 mm.

The material of the main body side terminal 1 and the drawer frame side terminal 4 was copper (Cu). The volume resistivity ρ of copper (Cu) is, for example, 2.23 × 10 ^-8 Ωm. The thermal conductivity λ of copper (Cu) is, for example, 398 W / (mK).

In the second comparative example, the main body side terminal 1 and the drawer frame side terminal 4 had a uniform thickness. The thickness of the main body side terminal 1 and the drawer frame side terminal 4 was 15 mm. Further, the width, length, and the length of the portion through which the current flows in the main body side terminal 1 and the drawer frame side terminal 4 in the second comparative example were the same as those in the embodiment.

The resistance R of the part where the current flows is calculated by the following formula based on the volume resistivity ρ, the length L of the part where the current flows, and the cross-sectional area S of the part where the current flows.

R = ρ × L / S
In the second comparative example, the resistance R at the portion where the current flows was 1.1 μΩ.

Further, the ease of heat transfer (heat conductance G (W / K)) is calculated by the following formula based on the thermal conductivity λ, the heat transfer length L, and the cross-sectional area S.

G = λ × S / L
In the second comparative example, the thermal conductance was 8 W / K.

The thickness of the thin portion is reduced by 1 mm from 14 mm, and the thickness of the thick portion is increased so that the sum of the resistance of the thin portion and the resistance of the thick portion maintains the same 1.1 μΩ as in the second comparative example. Was done. The thin-walled portion is a thin-walled portion 3 on the main body side and a thin-walled portion 6 on the drawer frame side. Further, the thick portion is a thick portion 2 on the main body side and a thick portion 5 on the drawer frame side. FIG. 32 is a graph showing the relationship between the thickness of the thin portion and the thickness of the thick portion in a state where the resistance is maintained at a constant value. In FIG. 32, the thickness of the thin portion and the thickness of the thick portion when the resistance is 1.1 μΩ are shown by solid lines. Further, the thickness of the thin portion and the thickness of the thick portion when the resistance is 1.5 μΩ or less are indicated by a broken line.

In order to maintain the resistance value at a constant value, it is necessary that the thickness of the thick portion increases as the thickness of the thin portion decreases. Further, the thickness of the thin portion of 6.5 mm has an inflection point. When the thickness of the thin portion is 6.5 mm or less, the thickness of the thick portion needs to be extremely thick.

When the thickness of the thick portion is 50 mm or more, the distance between the terminals of the adjacent phases becomes short, so that the Lorentz force generated by the current flowing through the terminals of the adjacent phases becomes large. Therefore, when the thickness of the thick portion is 50 mm or more, it is difficult to apply it to the drawer type circuit breaker 100.

In the range of the thickness of the thin portion and the thick portion shown in FIG. 32, the thermal conductance G is maintained at 8 W / K even if the thickness of the thin portion is changed.

Therefore, even when the thin-walled portion is provided as in the present embodiment, the same resistance and thermal conductance as in the second comparative example in which the thin-walled portion is not provided can be obtained.

Further, in the range where the thickness of the thin portion is 7 mm or more, the resistance is reduced and the thermal conductance is increased by increasing the thickness of the thick portion. Therefore, the energization capacity increases.

In the above structure, the sum of the thickness of the thick portion and the thickness of the thin portion is approximately 30 mm. Therefore, if the sum of the thickness of the thick portion and the thickness of the thin portion is at least twice the reference thickness (15 mm), the resistance and the thermal conductance are maintained. Further, since there is an inflection in the thickness of the thin portion of 6.5 mm, it is desirable that the thickness of the thin portion is 0.43 times or more the standard thickness (15 mm).

When the rated current is small, the temperature rise with respect to the rated current can be suppressed to the specified temperature or less even if the resistance is larger than 1.1 μΩ. When the rated current is small, for example, the resistance may be 1.5 μΩ.

The relationship between the thickness of the thin portion and the thickness of the thick portion when the resistance was 1.5 μΩ was calculated in the same manner as when the resistance was 1.1 μΩ. The thickness of the thin portion was reduced by 1 mm from 14 mm, and the thickness of the thick portion was increased so that the sum of the resistance of the thin portion and the resistance of the thick portion was maintained at 1.5 μΩ. In the range where the thickness of the thin portion was 7 mm or more and 14 mm or less, the resistance was 1.5 μΩ or less when the thick portion was 15 mm. Therefore, the thickness of the thick portion may be 15 mm as long as the thickness of the thin portion is 7 mm or more and 14 mm or less. In the range where the thickness of the thin portion is 6 mm or less, the thickness of the thick portion becomes thick. The thickness of the thin portion of 4.5 mm has an inflection point. Further, in the range where the thickness of the thin portion is 4.5 mm or less, the thickness of the thick portion needs to be extremely thick.

The thermal conductance G when the resistance is 1.5 μΩ decreases from 8 W / K to 6 W / K as the thin portion becomes thinner. However, when the rated current is small, the temperature rise with respect to the rated current can be suppressed to a specified temperature or lower. Further, cooling fins may be attached if necessary.

In the above structure, the sum of the thickness of the thick portion and the thickness of the thin portion is approximately 23 mm. Therefore, if the sum of the thickness of the thick portion and the thickness of the thin portion is 1.5 times or more the reference thickness (15 mm), the resistance and the thermal conductance are maintained. Further, since there is an inflection in the thickness of the thin portion of 4.5 mm, it is desirable that the thickness of the thin portion is 0.3 times or more the standard thickness (15 mm).

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present disclosure is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

1 Main body side terminal, 1R R phase main body side terminal part, 1S S phase main body side terminal part, 1S1 main body side 1st surface, 1S2 main body side 2nd surface, 1T T phase main body side terminal part, 2 Main body side thick part, 3 Main body side thin wall part, 4 Drawer frame side terminal, 4R R phase drawer frame side terminal part, 4S S phase drawer frame side terminal part, 4T T phase drawer frame side terminal part, 7th 1st Finger, 7a 1st finger part, 7b 2nd finger part, 8 2nd finger, 8a 3rd finger part, 8b 4th finger part, 10 main body side stage part, 11 1st main body side terminal part, 12 2nd Main body side terminal part, 13 3rd main body side terminal part, 21 1st main body side thick part, 22 2nd main body side thick part, 31 1st main body side thin wall part, 32 2nd main body side Thin-walled part, 33 3rd main body side thin-walled part, 41 1st drawer frame side terminal part, 42 2nd drawer frame side terminal part, 43 3rd drawer frame side terminal part, 100 drawer type breaker, B main body part, BR R phase main body, BS S phase main body, BT T phase main body, E tip, E1 first end, E3 second end, F drawer frame, J junction, J1 first junction, J2 second junction Department, J3 3rd Junction Department.

Claims

Withdrawal frame and
The main body, which is configured to be drawerable with respect to the drawer frame,
The main body side terminal including the main body side thick portion connected to the main body portion, the main body portion side thick portion, and the main body portion side thin wall portion arranged along the first direction,
A drawer frame side terminal connected to the drawer frame so as to face the main body side terminal along the first direction,
It is provided with a junction that can be connected to the drawer frame side terminal inside the drawer frame.
The main body side terminal is configured to be connectable to the junction by moving the main body with respect to the drawer frame.
The thin-walled portion on the main body portion has a first surface on the main body portion side and a second surface on the main body portion side facing each other in parallel along a second direction orthogonal to the first direction.
The junction includes a first finger and a second finger that can be connected to the thin wall portion on the main body side by sandwiching the first surface on the main body side and the second surface on the main body side along the second direction. ,
The dimension of the thick portion on the main body side along the first direction is larger than the dimension of the thin portion on the main body side along the first direction.
The dimension of the thin wall portion on the main body side along the second direction is smaller than the dimension of the thick wall portion on the main body portion side along the second direction.
A drawer type circuit breaker in which the first surface on the main body side and the second surface on the main body side of the thin wall portion on the main body side are flat.
The dimension of the thin wall portion on the main body side along the second direction is 0.3 times or more and 1.0 times or less the dimension of the drawer frame side terminal along the second direction.
The sum of the dimension along the second direction of the thin wall portion on the main body portion and the dimension along the second direction with the thick wall portion on the main body portion side is along the second direction of the drawer frame side terminal. The drawer type circuit breaker according to claim 1, which is 1.5 times or more the size.
The first shortest distance between the junction and the thick portion on the main body side along the first direction is along the first direction of the junction when the maximum current of the short-time withstand current test flows through the junction. Greater than the maximum increase in distance
The thin-walled portion on the main body portion side has a tip portion in the first direction and has a tip portion.
The second shortest distance along the first direction between the portion of the junction that is in contact with the thin-walled portion on the main body side and the tip portion is the main body portion when the maximum current of the short-time withstand current test flows. The drawer type circuit breaker according to claim 1 or 2, which is larger than the sum of the maximum increase amount of the distance between the side terminal and the drawer frame side terminal along the first direction and the first shortest distance.
The main body side terminal is a first main body side terminal having a first main body side thick portion, the first main body side thick portion, and a first main body side thin wall portion arranged along the first direction. It has a portion, a thick portion on the side of the second main body, a thick portion on the side of the second main body, and a thin portion on the side of the second main body arranged along the first direction, and a terminal portion on the side of the first main body. Including the second main body side terminal part electrically connected to
The second main body side terminal portion is arranged along the second direction away from the first main body side terminal portion.
The junction includes a first junction portion that sandwiches the thin wall portion on the side of the first main body portion along the second direction, and a second junction portion that sandwiches the thin wall portion on the side of the second main body portion along the second direction. Including,
The dimension of the thin portion on the first main body side along the second direction is smaller than the dimension of the thick portion on the side of the first main body along the second direction.
Any one of claims 1 to 3, wherein the dimension of the thin wall portion on the side of the second main body portion along the second direction is smaller than the dimension of the thick portion on the side of the second main body portion along the second direction. The drawer type circuit breaker described in the section.
The thin wall portion on the first main body portion side is opposite to the thin wall portion on the second main body portion side with respect to the center of the terminal portion on the second main body portion side in the second direction of the thick wall portion on the first main body portion side. Is located in
The second main body side thin-walled portion is opposite to the first main body side thin-walled portion with respect to the center of the first main body side terminal portion in the second direction of the second main body side thick-walled portion. The drawer type circuit breaker according to claim 4, which is arranged in.
The main body side terminal includes a third main body side terminal portion having a third main body portion side thin wall portion and electrically connected to the first main body portion side terminal portion.
The third main body side terminal portion is arranged away from the first main body side terminal portion along a third direction orthogonal to each of the first direction and the second direction.
The junction includes a third junction portion that sandwiches the thin wall portion on the side of the third main body portion along the second direction.
The thin wall portion on the first main body portion side is arranged away from the first junction portion and in the third direction arranged on the side opposite to the terminal portion on the second main body portion side with respect to the first junction portion. Has a first end
The thin wall portion on the side of the third main body portion is arranged away from the third junction portion and is arranged on the side opposite to the terminal portion on the side of the first main body portion with respect to the third junction portion in the third direction. Has a third end
The third shortest distance between the first end portion and the first junction portion along the third direction is the third direction of the first junction portion when the maximum current of the short-time withstand current test flows. Greater than the first maximum displacement along
The fourth shortest distance between the third end portion and the third junction portion along the third direction is the third direction of the third junction portion when the maximum current of the short-time withstand current test flows. The drawer type circuit breaker according to claim 4 or 5, which is larger than the third maximum displacement along the line.
The main body side terminal includes a main body side step portion arranged between the main body side thick portion and the main body side thin wall portion along the first direction.
The first finger and the second finger sandwich the main body side step portion at intervals along the second direction.
The dimension of the main body side step portion along the second direction is larger than the dimension of the main body side thin wall portion along the second direction and along the second direction of the main body portion side thick wall portion. The drawer type circuit breaker according to any one of claims 1 to 6, which is smaller than the size of the above.
The main body side terminal includes a main body side stopper portion arranged along the main body portion side thin wall portion from the main body portion side thick portion.
The first finger includes a first finger portion and a second finger portion.
The second finger includes a third finger portion and a fourth finger portion, and includes a third finger portion and a fourth finger portion.
The first finger portion and the second finger portion sandwich the stopper portion on the main body portion side along the thickness direction of the thin wall portion on the main body portion side.
The third finger portion and the fourth finger portion have the stopper portion on the main body portion side sandwiched along the thickness direction of the thin wall portion on the main body portion side, according to any one of claims 1 to 7. Drawer type circuit breaker.
Three-phase currents, R-phase current, S-phase current, and T-phase current, flow,
The main body portion includes an R phase main body portion for flowing an R phase current, an S phase main body portion for flowing an S phase current, and a T phase main body portion for flowing a T phase current.
The R-phase main body, the S-phase main body, and the T-phase main body are sequentially arranged along the second direction.
The main body side terminal is connected to the R phase main body side terminal portion connected to the R phase main body portion, the S phase main body side terminal portion connected to the S phase main body portion, and the T phase main body portion. Including the terminal part on the side of the main body of the T phase
The junction includes an R-phase junction portion, an S-phase junction portion, and a T-phase junction portion.
The lead-out frame side terminals are an R-phase drawer frame-side terminal portion electrically connected to the R-phase main body-side terminal portion by the R-phase junction portion, and the S-phase main body portion-side terminal by the S-phase junction portion. A T-phase lead-out frame-side terminal portion electrically connected to the T-phase lead-out frame-side terminal portion and a T-phase lead-out frame-side terminal portion electrically connected to the T-phase main body portion-side terminal by the T-phase junction portion are included.
The shortest R-phase distance between the R-phase main body side terminal portion and the R-phase extraction frame side terminal portion along the first direction, and the T-phase main body portion side terminal portion and the T-phase drawer frame side terminal portion. Each of the T-phase shortest distances along the first direction is shorter than the S-phase shortest distance along the first direction between the S-phase main body side terminal portion and the S-phase drawer frame side terminal portion. Item 5. The drawer type circuit breaker according to any one of Items 1 to 8.
The first finger is a first connection portion that electrically connects the thin wall portion on the main body portion side and the terminal on the drawer frame side, and the first connection between the thin wall portion on the main body portion side and the terminal on the drawer frame side. Including the first protrusion connected to the portion
The second finger is a second connection portion that electrically connects the thin wall portion on the main body portion side and the terminal on the drawer frame side, and the second connection between the thin wall portion on the main body portion side and the terminal on the drawer frame side. Including the second protrusion connected to the portion
The first protrusion extends along the second direction toward the second finger.
The second protrusion extends along the second direction toward the first finger.
The drawer according to any one of claims 1 to 9, wherein the second protrusion overlaps the first protrusion along a direction orthogonal to each of the first direction and the second direction. Shape breaker.
The dimension of the first protrusion along the orthogonal direction is smaller than the dimension of the first connection portion along the orthogonal direction.
The dimension of the second protrusion along the orthogonal direction is smaller than the dimension of the second connection portion along the orthogonal direction.
The drawer type circuit breaker according to claim 10, wherein the first finger is fitted to the second finger by superimposing the first protrusion on the second protrusion along the orthogonal direction.
The first connection portion is provided with a first recess that is recessed toward the second connection portion along the second direction.
The second connection portion is provided with a second recess that is recessed toward the first connection portion along the second direction.
The junction has a first spring portion attached to the first connection portion on the opposite side of the first connection portion from the second connection portion, and the first connection portion to the second connection portion. It includes a second spring portion attached to the second connection portion on the opposite side to the above, and a frame portion that sandwiches the first spring portion and the second spring portion along the first direction.
The first spring portion is configured to be deformable along the first recess of the first finger.
The drawer type circuit breaker according to claim 10 or 11, wherein the second spring portion is configured to be deformable along the second recess of the second finger.