CN111755288A - breaker - Google Patents

Abstract

The present invention relates to a circuit breaker. An object of the present disclosure is to achieve miniaturization and to achieve an improvement in ease of positioning of the resistor. A circuit breaker (1) includes a resistor (R1), a holding structure (H1), and a body (5). The holding structure (H1) is block-shaped, and the resistor (R1) is held. The body (5) accommodates at least the resistor (R1) and the holding structure (H1).

Description

breaker

technical field

In general, the present disclosure relates to circuit breakers, and more particularly, the present disclosure relates to circuit breakers with resistors.

Background technique

In Japanese JP2015-103411A (hereinafter referred to as "Document 1"), an earth leakage circuit breaker including an opening and closing mechanism part, a zero-phase current detection circuit part, and an earth leakage trip coil part is described. The opening and closing mechanism portion opens and closes the movable contact of the movable contact and the fixed contact of the fixed contact, and opens and closes the power supply side circuit and the load side circuit. The zero-phase current detection circuit unit is composed of a circuit board and a zero-phase current transformer mounted on the circuit board. The earth leakage trip coil part is mounted on the circuit board, and is connected to the opening and closing mechanism part.

According to the earth leakage circuit breaker described in Document 1, since the zero-phase current transformer and the earth leakage trip coil part are mounted on the same circuit board, the workability of assembling the components is facilitated, and the connection work can be simplified.

SUMMARY OF THE INVENTION

Invention to solve problem

In addition, there is a case where a circuit breaker (earth leakage circuit breaker) includes a resistor inside its casing (body). Furthermore, in order to reduce the size of the circuit breaker, if the resistor is mounted on the circuit board, the storage space of the circuit board is limited, which may hinder the miniaturization of the circuit breaker. On the other hand, if the resistor is not mounted on the circuit board, the positioning of the resistor may be difficult.

The present disclosure has been made in view of the above-mentioned reasons, and an object thereof is to provide a circuit breaker that can achieve miniaturization and can achieve improved ease of positioning of a resistor.

solution to the problem

A circuit breaker according to one aspect of the present disclosure includes a resistor, a holding structure, and a body. The holding structure has a block shape and holds the resistor. The body accommodates at least the resistor and the holding structure.

effect of invention

According to the present disclosure, there is an advantage that miniaturization can be achieved and an improvement in ease of positioning of the resistor can be achieved.

Description of drawings

1 : is a top view of the state which removed the 1st block in the circuit breaker which concerns on one Embodiment of this indication, and is the figure which closed the 1st contact part.

It is a top view of the state which removed the 1st block in this circuit breaker, and is the figure which opened the 1st contact part.

FIG. 3 is a perspective view of the circuit breaker.

FIG. 4 is an exploded perspective view of the circuit breaker.

FIG. 5 is a schematic circuit diagram of the circuit breaker.

6A is a perspective view of a main part including a holding structure of the circuit breaker.

6B is a perspective view of a main part including a holding structure of the circuit breaker.

FIG. 7 is a perspective view of the main part including two torsion springs of the circuit breaker.

8A is a plan view of a main part of the left wall of the body of the circuit breaker viewed from the inside.

FIG. 8B is a plan view of the main part of the right wall of the device body viewed from the inside.

9A is a perspective view of a main part including a second contact part of the circuit breaker, and is a diagram in which the second contact part is closed.

9B is a perspective view of a main part including the second contact portion, and is a view in which the second contact portion is disconnected.

FIG. 10A is a plan view of the main part of FIG. 9A .

FIG. 10B is a plan view of the main part of FIG. 9B .

11A is a perspective view of a main part including a third contact portion of the circuit breaker, and is a view in which the third contact portion is opened.

11B is a perspective view of a main part including the third contact portion, and is a view in which the third contact portion is closed.

FIG. 12A is a diagram showing a state in which the circuit breaker is attached to an installation object, and is a diagram showing a positive connection to the electric wire on the power supply side.

12B is a diagram showing a state in which the circuit breaker is attached to an installation object, and is a diagram of reverse connection with the electric wire on the power supply side.

Description of reference numerals

1. Circuit breaker; 11, 1st contact part (contact part); 12, 2nd contact part; 121, movable contact; 122, fixed contact; 2, leakage detection part; 21, zero phase change Current device; 22, control part; 4, trip mechanism; 42, leakage trip coil; 5, device body; 50, holding part; B1, operation part; C1, main circuit; C2, power circuit; C4, analog leakage generation part ; H1, holding structure; H10, housing part; L1, energized circuit; M1, conductor member; R1, resistor; R2, main body; R3, lead terminal; T1, first torsion spring (torsion spring); T2, first 2 torsion spring (torsion spring); W1, wire.

Detailed ways

(1) Outline

The drawings described in the following embodiments are schematic drawings, and the ratios of the sizes and thicknesses of the respective components in the drawings are not necessarily limited to reflect the actual dimensional ratios.

As shown in FIGS. 1 and 2 , the circuit breaker 1 of the present embodiment includes a resistor R1 , a holding structure H1 , and a body 5 . The holding structure H1 has a block shape and holds the resistor R1. The body 5 accommodates at least the resistor R1 and the holding structure H1.

In addition, as shown in FIGS. 1 , 2 and 5 , the circuit breaker 1 further includes a first contact portion 11 and a second contact portion 12 .

The first contact portion 11 opens in response to the occurrence of an abnormal current, and switches the main circuit C1 (see FIG. 5 ) from an energized state to an off state. The abnormal current referred to here includes, for example, leakage current. That is, in the present disclosure, it is assumed that the circuit breaker 1 is an earth leakage circuit breaker as an example. The first contact portion 11 is switched from on (on) to off (off) in response to the occurrence of leakage current, and the main circuit C1 is cut off. In addition, abnormal currents include, for example, overcurrents (short-circuit currents and overload currents). The circuit breaker 1 switches itself from on (on) to off (off) in response to the occurrence of an overcurrent, and shuts off the main circuit C1 .

As shown in FIG. 5 , the circuit breaker 1 includes a pair of first contact portions 11, and the first contact portions 11 are inserted into the first circuit C11 and the second circuit C12 constituting the main circuit C1, respectively. Hereinafter, the pair of first terminals 71 (see FIG. 5 ) of the circuit breaker 1 may be connected to the pair of electric wires 103 (see FIG. 12A ) on the power supply side, and the pair of second terminals 72 (see FIG. 5 ) of the circuit breaker 1 may be connected. The state of being connected to the pair of electric wires 104 (see FIG. 12A ) on the load side is referred to as a “positive connection state”. The first circuit C11 may be, for example, the L phase to which the wire 103A on the L pole (LINE) side is connected, and the second circuit C12 may be the N phase to which the wire 103B on the N pole (NEUTRAL LINE) side is connected.

However, in the circuit breaker 1, on the contrary, the pair of first terminals 71 can be connected to the pair of electric wires 104 on the load side, and the pair of second terminals 72 can be connected to the pair of electric wires 103 on the power supply side. (refer to FIG. 12B ) is called "reverse connection state". Hereinafter, the case where the circuit breaker 1 is in a forward connection state or a reverse connection state may be simply referred to as "the circuit breaker 1 is in use".

The second contact portion 12 is disconnected in conjunction with the disconnection of the first contact portion 11 , and switches the power supply circuit C2 (see FIG. 5 ) branched from the main circuit C1 from the energized state to the disconnected state. That is, the second contact portion 12 is switched from on (on) to off (off) in conjunction with the switching of the first contact portion 11 from on (on) to off (off), and the energization of the power supply circuit C2 is cut off. .

Thus, the circuit breaker 1 includes the holding structure H1 that holds the resistor R1. Therefore, for example, the circuit breaker 1 can be reduced in size compared to the case where the resistor R1 is mounted on the circuit board 6 (refer to FIG. 1 ) in which the storage space is limited in the body 5 . In addition, an improvement in ease of positioning of the resistor R1 can be achieved.

(2)Details

Next, the circuit breaker 1 of the present embodiment will be described in more detail with reference to FIGS. 1 to 12B .

(2.1) Overall structure

As described above, the circuit breaker 1 includes the holding structure H1 , the body 5 , the pair of first contact portions 11 and the second contact portion 12 . Further, as shown in FIG. 5 , the circuit breaker 1 further includes a pseudo-leakage generating unit C4 having the above-described resistor R1 , and a leakage detecting unit 2 (sensor). In addition, as shown in FIGS. 1 and 2 , the circuit breaker 1 further includes a trip mechanism 4 , a circuit board 6 , two pairs of terminal portions 7 (four in total), an arc suppression device 8 , and a link mechanism 15 (operating handle 16 ). Wait). In addition, the circuit breaker 1 further includes a pair of braided wires D1 (connecting wires), an operation part B1 (for testing), and the like.

As described above, as an example, the circuit breaker 1 is an earth leakage circuit breaker having a function of detecting leakage current and cutting off the energization of the main circuit C1 (leakage detection function). Electric disk, etc. As shown in FIGS. 12A and 12B , the circuit breaker 1 is attached to the attachment surface 102 of the object 100 to be attached. It is assumed that the object 100 is a structural member (for example, a DIN rail) or the like in the distribution board. The mounting surface 102 is, for example, the surface of the DIN rail facing the circuit breaker 1 .

The circuit breaker 1 has a function of detecting overcurrents such as short-circuit current and overload current, and cutting off the energization of the main circuit C1 (overcurrent detection function), in addition to the leakage detection function. In addition, the circuit breaker 1 has a function (test function) of generating a leakage current in a simulated manner to test whether or not the opening of the contact parts ( 11 , 12 ) by the trip mechanism 4 operates normally.

Moreover, the circuit breaker 1 is comprised so that the contact part (11,12) can be switched from closing to opening and from opening to closing in accordance with the manual operation of the operating handle 16. For example, after opening the contact parts ( 11 , 12 ) by detecting an abnormal current, the user can return the contact parts ( 11 , 12 ) to close by operating the operating handle 16 when the safety is confirmed.

In addition, in FIG.1, FIG.2 and FIG.4, illustration of the electric wire in the receptacle 5 is abbreviate|omitted suitably (refer FIG. 5 for an electrical connection relationship).

(2.2) Body

As shown in FIGS. 3 and 4 , the body 5 has a flat, substantially rectangular box shape as a whole. Hereinafter, the direction along the thickness direction of the body 5 may also be referred to as the "left-right direction" of the circuit breaker 1 . In addition, hereinafter, as shown in FIG. 12A , the direction perpendicular (orthogonal) to the horizontal plane in the state where the circuit breaker 1 is mounted on the mounting surface 102 of the mounted object 100 is referred to as the “up and down direction”, and the front view is viewed from the front. In the case of the circuit breaker 1, the downward direction (vertical direction) will be described as "downward". In addition, the right side when the circuit breaker 1 is viewed from the front is referred to as "right side" and the left side is referred to as "left side" for description. In addition, the direction orthogonal to both the vertical direction and the left-right direction, that is, the direction orthogonal to the mounting surface 102 is referred to as the "front and rear direction", and the back side of the mounting surface 102 is referred to as the "rear" for description. However, the above-mentioned directions are not intended to limit the use directions of the circuit breaker 1 .

As shown in FIG. 4 , the body 5 includes a first block 5A (right block), a second block 5B (left block), and a third block (core) 5C. In addition, in FIG. 4, the 1st block 5A and the 2nd block 5B are shown by dot hatching. The first block 5A, the second block 5B, and the third block 5C are formed of a synthetic resin material having electrical insulating properties.

The body 5 accommodates a pair of the first contact part 11 , the second contact part 12 , the leak detection part 2 , the trip mechanism 4 , the circuit board 6 , the four terminal parts 7 , the arc extinguishing device 8 , and the link mechanism inside the body 5 . 15. Simulate the leakage current generating portion C4, the pair of braided wires D1, the holding structure H1, and the like. In addition, as shown in FIGS. 1 and 2 , the body 5 supports a part (rod 160 ) of the operation handle 16 and a part (protrusion B10 ) of the operation part B1 so as to be exposed to the outside from the front wall 55 thereof. The front wall 55 protrudes forward so that the center part in the vertical direction protrudes, and the rod 160 and the protrusion B10 are exposed to the outside from the center part of the protrusion.

The 1st block 5A and the 2nd block 5B are formed in the substantially rectangular box shape in which the surface on the side which opposes mutually is opened. The third block 5C is formed in a substantially plate shape. The third block 5C has a plurality of recesses, ribs, protrusions, grooves, and the like so as to stably hold the plurality of components housed in the container 5 together with the first block 5A and the second block 5B. The body 5 is configured by butt-joining the first block 5A and the second block 5B so as to sandwich the third block 5C from the left and right, respectively. 1 and 2 are plan views of the circuit breaker 1 in a state in which the first block 5A is removed from the right side.

Hereinafter, the space in which the circuit board 6 of the container body 5 is accommodated may also be referred to as a first accommodation portion S1 (see FIGS. 1 and 2 ). In other words, the container 5 has the first storage portion S1.

(2.3) Terminal part

The four terminal portions 7 include a pair of first terminal portions 7A and a pair of second terminal portions 7B (see FIGS. 1 and 2 ). However, in FIGS. 1 and 2 , only the right first terminal portion 7A of the pair of first terminal portions 7A is shown, and similarly, only the right second terminal portion 7B of the pair of second terminal portions 7B is shown. Terminal portion 7B. Each first terminal portion 7A corresponds to the first terminal 71 in FIG. 5 . Each second terminal portion 7B corresponds to the second terminal 72 in FIG. 5 .

A pair of 1st terminal parts 7A are accommodated in the upper end part in the receptacle 5 so that it may be aligned along the left-right direction. When the circuit breaker 1 is in the normal connection state, the pair of electric wires 103 on the side of the external power source (eg, commercial AC power source) are respectively connected to the pair of first terminal portions 7A.

The pair of second terminal portions 7B are housed in the lower end portion of the housing 5 so as to be aligned in the left-right direction. When the circuit breaker 1 is in the normal connection state, the pair of electric wires 104 on the load side are respectively connected to the pair of second terminal portions 7B. Hereinafter, the space in which the second terminal portion 7B of the body 5 is accommodated is also referred to as a second accommodation portion S2 (see FIGS. 1 and 2 ). In other words, the container 5 has the second storage portion S2. The body 5 has a pair of second housing portions S2 to individually house a pair of second terminal portions 7B. A pair of 2nd accommodating part S2 is located in the side (lower side) of 1st accommodating part S1. However, the container 5 has the partition wall 53A which partitions the 1st accommodation part S1 and a pair of 2nd accommodation part S2. The receptacle 5 also has a pair of accommodating portions for accommodating the pair of first terminal portions 7A individually, and detailed descriptions thereof are omitted.

Here, the electrical path from the pair of first terminal portions 7A to the pair of second terminal portions 7B corresponds to the main circuit C1. As described above, the main circuit C1 is composed of the first circuit C11 (L-phase) and the second circuit C12 (N-phase).

Each of the terminal portions 7 is, for example, a so-called post terminal (screw-type terminal) that can be wired with a screw. As shown in FIGS. 1 , 2 and 4 , each terminal portion 7 includes a terminal plate 73 , a terminal fitting 74 , and a terminal screw 75 .

The terminal plate 73 is formed in a substantially L-shaped plate shape from a conductive metal plate. The terminal board 73 is fixed in the body 5 .

The terminal fittings 74 are formed in a rectangular cylindrical shape from a conductive metal plate. The terminal fitting 74 has the up-down direction as an axis, and both ends in the up-down direction are open. The terminal fittings 74 are movable within a predetermined range in the front-rear direction in the body 5 in a state in which a portion of the terminal plate 73 (tab 730 : see FIG. 4 ) is inserted. In addition, the terminal fittings 74 have screw holes into which the terminal screws 75 are screwed. The body 5 has the insertion ports 51 (four in total) through which the power supply wires ( 103 or 104 ) are inserted in the region facing the space SP1 (see FIG. 4 ) between the protruding piece 730 and the bottom wall of the terminal fitting 74 .

The terminal screw 75 is accommodated in the housing 5 in a state in which the screw tip is screwed into the screw hole of the terminal fitting 74 . The body 5 has, in a region of the front wall 55 facing the head of each terminal screw 75 , holes 57 (four in total) that expose the head of the terminal screw 75 so that the terminal screw 75 does not fall off.

In the state where the electric wire ( 103 or 104 ) is inserted into the space SP1 from the insertion port 51 , the distal end of a tool such as a screwdriver is inserted through the hole 57 to tighten the terminal screw 75 , so that the terminal fitting 74 moves forward, and the protrusion 730 and the terminal The distance of the bottom wall of the fitting 74 is reduced. As a result, the wire ( 103 or 104 ) inserted into the space SP1 can be connected to the terminal portion 7 .

When the electric wire 103 and the electric wire 104 (conductive portion) are insulated wires in which a core wire composed of a conductor is covered with an insulating sheath, only the distal end portion of the electric wire with the insulating sheath removed, that is, the core wire is inserted through the insertion port 51 . The electric wire 103 and the electric wire 104 may be either a single wire whose core wire is composed of one conductor or a twisted wire whose core wire is composed of a plurality of conducting wires. Alternatively, at least one of the electric wire 103 and the electric wire 104 may be a square conductive bar (conductive portion) not covered with an insulating sheath.

In addition, the gap SP1 of the upper and lower two terminal parts 7 corresponding to the start end and the end end of the first circuit C11 and the insertion opening 51 are arranged in a space larger than the gap SP1 of the upper and lower two terminal parts 7 corresponding to the start end and the end end of the second circuit C12 SP1 and the insertion port 51 are slightly shifted forward (refer to the insertion port 51 in FIG. 3 ). Therefore, erroneous wiring of the conductive parts (electric wires 103, 104, conductive bars, etc.) can be suppressed.

(2.4) The first contact part

The pair of first contact portions 11 are configured to open in response to the occurrence of abnormal currents (here, leakage currents, short-circuit currents, and overload currents, as examples), and switch the main circuit C1 from an energized state to an off state. A pair of 1st contact part 11 is provided in the 1st circuit C11 and the 2nd circuit C12 of the main circuit C1, respectively. As shown in FIGS. 1 and 2 , each first contact portion 11 includes a fixed contact 11A and a movable contact 11B that is in contact with or separated from the fixed contact 11A. FIG. 1 shows a state in which the pair of first contact parts 11 are closed, and FIG. 2 shows a state in which the pair of first contact parts is opened. However, in FIGS. 1 and 2 , only the first contact portion 11 on the right is shown.

The fixed contact 11A is fixedly attached to the fixed contact plate 110, for example. In other words, the fixed contact 11A is a separate member from the fixed contact plate 110 . However, the fixed contact 11A may be integrated with the fixed contact plate 110 as a part of the fixed contact plate 110 . The fixed contact plate 110 is formed of a low-resistance material such as iron or copper. The fixed contact plate 110 constitutes a part of the main circuit C1.

The movable contact 11B is located at one end of an arm 111 (movable contact) formed by punching and bending a metal plate. The movable contact 11B is integrated with the arm 111 as a part of the arm 111 . However, the movable contact 11B may be a member independent of the arm 111 , and may be fixedly attached to one end of the arm 111 . The arm 111 constitutes a part of the main circuit C1.

The arm 111 is rotatable between a position where the movable contact 11B is in contact with the fixed contact 11A and a position where the movable contact 11B is separated from the fixed contact 11A using the shaft 112 provided on the other end side as a fulcrum. One end of the braided wire 113 is fixedly attached to the middle portion of the arm 111 . The braided wire 113 constitutes a part of the main circuit C1.

The other end of the braided wire 113 of the first circuit C11 among the two braided wires 113 of the first circuit C11 and the second circuit C12 is fixedly attached to the middle part of the bimetal plate 17 of the trip mechanism 4 described later. One end of the bimetal 17 is fixedly attached to one end of the braided wire 114 , and the other end of the braided wire 114 is fixedly attached to the terminal plate 73 of the corresponding (right) first terminal portion 7A. The bimetal 17 and the braided wire 114 constitute a part of the main circuit C1.

On the other hand, the other end of the braided wire 113 of the second circuit C12 is directly fixed and attached to the terminal plate 73 of the corresponding (left side) first terminal portion 7A.

(2.5) Linkage mechanism

The link mechanism 15 is configured to open or close both of the pair of first contact portions 11 in response to an opening operation (off operation) or a closing operation (on operation). As shown in FIGS. 1 and 2 , the link mechanism 15 includes an operating handle 16 and a plurality of link members 150 . The operating handle 16 is rotatably supported on the housing 5 with a lever (operating grip) 160 protruding to the outside of the housing 5 from a window hole 58 (see FIG. 3 ) provided in the front wall 55 of the housing 5 . Each link member 150 connects the operation handle 16 and the arm 111 , and the arm 111 is linked with the rotation operation of the operation handle 16 . The operating handle 16 is rotatable between the on position for closing the pair of first contact portions 11 and the off position for opening the pair of first contact portions 11 .

In FIG. 1 , the first contact part 11 is in a closed state, and the lever 160 of the operating handle 16 is in a state inclined upward. On the other hand, in FIG. 2 , the first contact portion 11 is in an open state, and the lever 160 of the operating handle 16 is in a state in which it is inclined downward.

The operating handle 16 is configured to open or close the second contact portion 12 to be described later together with the pair of first contact portions 11 . Specifically, the link mechanism 15 has the pressing portion 14 as one of the plurality of link members 150 . The pressing portion 14 (push rod) is formed integrally with a substantially rectangular plate-shaped portion and a portion protruding in a rod shape from the rear end of the portion. One end of the pressing portion 14 is rotatably inserted into the shaft hole of the link member 150 of the holding arm 111 , and the other end is connected to the shank portion of the first torsion spring T1 (described later) of the second contact portion 12 . The second end 322 of 32A is opposed to each other. The pressing portion 14 has an escape hole 140 (refer to FIGS. 9A and 9B ) that penetrates in the thickness direction on one side of the other end. For example, when the operating handle 16 is rotated from the off position to the on position, one end side of the pressing portion 14 rotates in the shaft hole of the link member 150 of the holding arm 111 and is lifted forward. On the other hand, the other end of the pressing portion 14 inserts the second end portion 322 of the shank portion 32A of the first torsion spring T1 into the escape hole 140 and presses the second end portion 322 . Conversely, when the operating handle 16 is rotated from the on position to the off position, the pressing portion 14 is returned to the original position, and the pressing of the first torsion spring T1 is released.

In FIG. 1 , the first contact portion 11 is in a closed state, and the second contact portion 12 is also in a closed state. In FIG. 2 , the first contact portion 11 is in an open state, and the second contact portion 12 is also in an open state.

(2.6) Trip mechanism

The trip mechanism 4 is configured to forcibly open (ie, trip) the pair of the first contact portion 11 and the second contact portion 12 by driving the above-described link mechanism 15 when an abnormal current is detected.

As shown in FIGS. 1 and 2 , the trip mechanism 4 includes a main circuit coil 41 , a leakage trip coil 42 (see FIG. 5 ), a yoke 43 , a fixed iron core, a movable iron core 44 , an ejector pin 45 , a return spring, and a double Metal plate 17. The main circuit coil 41, the leakage trip coil 42, the yoke 43, the ejector pin 45, and the return spring constitute the electromagnetic trip device 4A. The bimetallic plate 17 constitutes the thermal trip device 4B.

First, the electromagnetic trip device 4A will be described.

The main circuit coil 41 is housed in the housing 5 so that the axial direction thereof faces the vertical direction. As shown in FIG. 5, the main circuit coil 41 is inserted into the first circuit C11 of the main circuit C1. Specifically, the main circuit coil 41 has a first end 411 and a second end 412, the first end 411 is electrically connected to the first contact portion 11 (the fixed contact plate 110), and the second end 412 is connected to the main circuit C1 toward the The branch point P1 where the power supply circuit C2 branches is electrically connected. The main circuit coil 41 constitutes a part of the main circuit C1 (the first circuit C11).

The earth leakage trip coil 42 is accommodated in the receptacle 5 so that the axial direction thereof faces the vertical direction and is arranged inside the main circuit coil 41 . The peripheral surface of the earth leakage trip coil 42 is externally packaged with tape or the like. The leakage trip coil 42 is inserted into the electric wire W2 (see FIG. 5 ), and is electrically connected to the control unit 22 of the leakage detection unit 2 .

The fixed iron core is formed of a magnetic material, and is accommodated in the bobbin of the earth leakage trip coil 42 . The movable iron core 44 is formed of a magnetic material, and is disposed in the bobbin so as to be slidable between a position in contact with the fixed iron core and a position apart from the fixed iron core. The return spring is composed of, for example, a coil spring, and is accommodated between the movable iron core 44 and the fixed iron core in the bobbin. When the movable iron core 44 moves in the direction of contact with the fixed iron core, the return spring is deflected, and an elastic force is generated to move the movable iron core 44 in a direction away from the fixed iron core. The ejector pin 45 is coupled to the movable iron core 44, and the tip of the ejector pin protrudes to the outside of the bobbin. In addition, when the movable iron core 44 is attracted by the fixed iron core, the ejector pin 45 is configured such that its distal end moves together with a part of the link member 150 .

The yoke 43 is formed of a magnetic material, and is formed so as to be bent so as to cover the periphery of the main circuit coil 41 . However, the yoke 43 of the present embodiment is constituted by a part of one (right side) of the pair of fixed contact plates 110 .

When a short-circuit current flows through the first circuit C11, which is the main circuit coil 41, the movable iron core 44 is displaced upward against the spring force of the return spring to reduce the magnetic circuit formed by the yoke 43, the movable iron core 44, and the like. magnetoresistance. The ejector pin 45 protrudes upward in conjunction with this. At this time, the thrust of the ejector pin 45 is transmitted to the arm 111 via the link mechanism 15, and the arm 111 is driven so as to pull the movable contact 11B away from the fixed contact 11A. That is, a pair of 1st contact part 11 is tripped. At the same time, the pressing portion 14 is also driven by the operation handle 16 to release the pressing force applied to the first torsion spring T1, and the second contact portion 12 is also tripped. When the short-circuit current stops, the movable iron core 44 is displaced downward by the spring force of the return spring, and the ejector pin 45 is also returned to its original position.

Alternatively, when the leakage current is detected by the leakage detection unit 2 , the leakage detection unit 2 changes (eg, increases) the current value of the current flowing through the first power supply line C21 to flow to the leakage trip coil 42 as a drive current. As a result, as in the case of the main circuit coil 41, the ejector pin 45 protrudes upward, and the pair of first contact parts 11 trips, and at the same time, the second contact part 12 also trips. When the second contact portion trips, the supply of the operating power supply to the leakage detection portion 2 is cut off, so that the driving current flowing through the leakage trip coil 42 is also stopped, and the movable iron core 44 is displaced downward by the spring force of the return spring, and the top The pin 45 is also reset to its original position.

Next, the thermal trip device 4B will be described.

As the bimetallic plate 17 , a direct heating type bimetallic plate that is bent by self-heating or an indirect heating type bimetallic plate that is bent by heating by a heater can be used. One end of the bimetal plate 17 is configured to act together with a part of the link member 150 when the bimetal plate 17 is bent. One end of the braided wire 114 is fixedly mounted on the other end of the bimetallic plate 17 . The other end of the braided wire 114 is fixedly attached to the terminal plate 73 of the corresponding (right) first terminal portion 7A.

The bimetal 17 is deformed so as to bend in a direction in which one end is displaced upward when the temperature of the bimetal 17 rises when an overcurrent due to an overload flows, for example. When one end of the bimetal 17 is deformed, the thrust of the bimetal 17 is transmitted to the arm 111 via the link mechanism 15, thereby driving the arm 111 to pull the movable contact 11B away from the fixed contact 11A. That is, a pair of 1st contact part 11 is tripped. At the same time, the pressing portion 14 is also driven via the operating handle 16, the pressing applied to the first torsion spring T1 is released, and the second contact portion 12 is also tripped. When the overcurrent caused by the overload stops, the temperature of the bimetal plate 17 decreases and returns to its original shape.

(2.7) Arc suppression device

The arc extinguishing device 8 is configured to quickly extinguish the arc generated when the first contact portion 11 is opened. As shown in FIGS. 1 and 2 , the arc extinguishing device 8 includes an arc running plate 81 and an arc extinguishing grid 82 .

The arc running plate 81 is formed by bending a strip-shaped metal plate, and one end thereof is coupled to one end (rear end) of the bimetal plate 17 . The arc running plate 81 is extended along the bottom wall 56 of the device body 5 . The arc extinguishing grid 82 has a support portion and a plurality of arc extinguishing plates. A plurality of arc extinguishing plates are formed of a conductive material, and are arranged in parallel with an interval along the front-rear direction. The support portion is formed of an electrically insulating material, and supports a plurality of arc extinguishing plates.

The arc extinguishing device 8 stretches the arc generated when the movable contact 11B is pulled away from the fixed contact 11 , and interrupts it to extinguish it. In addition, in the casing 5, a path 83 for discharging the gas generated by the arc described above is provided in the vicinity of the bottom wall 56 on the lower side of the arc extinguishing device 8, and an exhaust port serving as an outlet of the path 83 is provided on the bottom wall 56 84.

(2.8) Second contact part

The second contact portion 12 is disconnected in conjunction with the disconnection of the first contact portion 11, and switches the power supply circuit C2 branched from the main circuit C1 at the branch point P1 from the energized state to the disconnected state.

As shown in FIG. 5 , the power supply circuit C2 includes a first power supply line C21 and a second power supply line C22 , and is a circuit for supplying operating power for the control unit 22 of the leak detection unit 2 to be described later. One end of the first power supply line C21 is electrically connected to the second end 412 of the main circuit coil 41 of the first circuit C11. In addition, the other end of the first power supply line C21 is electrically connected to the control unit 22 . The second contact portion 12 is inserted in the middle of the first power cord C21. One end of the second power supply line C22 is electrically connected to a connection point P3 between the first terminal 71 of the second circuit C12 and the first contact portion 11 . In addition, the other end of the second power supply line C22 is electrically connected to the control unit 22 .

Here, the second contact portion 12 has the contact mechanism 3 (refer to FIGS. 9A to 10B ) that maintains the energized state of the power supply circuit C2 by contact at a plurality of points. Specifically, the contact mechanism 3 includes a conductor 31 and a conductive hairspring 32 having at least one shank 32A. The hairspring 32 is formed of, for example, stainless steel (SUS). In the present embodiment, as an example, as shown in FIG. 7 , the hairspring 32 is a torsion spring (first torsion spring T1 ) having a coil portion 32B in addition to the shank portion 32A. In particular, the hairspring 32 of the present embodiment is a double torsion spring having coil portions 32B (two in total) at both ends of the U-shape.

The contact mechanism 3 has a plurality of handle portions 32A. Each shank portion 32A is in contact with the conductor 31 at least at one point. However, as described above, the hairspring 32 is a double torsion spring, and the number of the shanks 32A is two. In other words, the number of the hairspring 32 is one, and the one hairspring 32 has two shanks 32A and is in contact with the conductor 31 at a plurality of points.

However, the balance spring 32 is not limited to one. For example, two or more independent hairsprings 32 may be provided, and each hairspring 32 may have at least one shank 32A.

As shown in FIGS. 9A and 9B , the second contact portion 12 has a movable contact 121 and a fixed contact 122 , and the fixed contact 122 is closed by contacting the movable contact 121 , and the fixed contact 122 is closed by contacting the movable contact 121 . separated and disconnected. However, here, the two shank portions 32A of the first torsion spring T1 are members constituting the movable contacts 121 , and the conductors 31 are members constituting the fixed contacts 122 .

As shown in FIG. 6B , the conductor 31 is formed of a wire material of a metal (eg, copper alloy) in a substantially L-shaped linear shape having a major axis portion 310 . The conductor 31 is fixed so that the long-axis portion 310 is along the thickness direction (left-right direction) of the body 5 . In particular, the conductor 31 is held by the holding structure H1 described later in the body 5 . One end of the conductor 31 is connected by soldering to one end of the electric wire W2 (see FIG. 5 : a part of the first power supply wire C21 ), and the other end of the electric wire W2 is joined to the second end 412 of the main circuit coil 41 by soldering or welding. connect.

The first torsion spring T1 is arranged behind the conductor 31 so that the two shank portions 32A face the conductor 31 . Here, the circuit breaker 1 further includes a support portion 13 that supports the first end portion 321 of the long axis of each shank portion 32A (see FIGS. 9A and 9B ). The support portion 13 is formed in a substantially U-shaped plate shape as a whole by, for example, punching a conductive plate material (eg, a metal plate).

As shown in FIG. 7 , the support portion 13 includes a rectangular plate-shaped main body portion 130 , a first protrusion 131 protruding rightward in a prismatic shape from the rear end of the right side surface of the main body portion 130 , and a The front end of the second protrusion 132 protrudes rightward in a prismatic shape. The left end of the main body portion 130 is fitted into the groove portion 590 of the left wall 59A of the container body 5 shown in FIG. 8A to be positioned in the container body 5 . On the other hand, the tips of both the first protrusion 131 and the second protrusion 132 are respectively fitted into the two recesses 591 of the right wall 59B of the container body 5 shown in FIG. 8B and positioned in the container body 5 . In other words, the body 5 has a configuration for positioning the support portion 13 . In addition, in FIG. 8A and FIG. 8B, the support part 13 is shown by a dot hatching.

In the support portion 13 , the first protrusions 131 are fitted into the two coil portions 32B of the first torsion spring T1 , and the second protrusions 132 are fitted into the coil portions T22 of the second torsion spring T2 (described later). In short, the support portion 13 supports the first torsion spring T1 and the second torsion spring T2 , and the two torsion springs ( T1 , T2 ) are electrically connected to each other via the support portion 13 . The support portion 13 is connected by soldering to one end of a wire W3 (see FIG. 5 : the other part of the first power cord C21 ), and the other end of the wire W3 is connected to the conductor pattern of the circuit board 6 by soldering and is electrically connected to the control unit 22 .

9A and 9B , each shank portion 32A of the first torsion spring T1 whose first end portion 321 is supported by the support portion 13 is arranged so that the second end portion 322 of its long axis is pressed by the link mechanism 15 The portion 14 is subjected to pressing. Specifically, each handle portion 32A is arranged so that the second end portion 322 faces the pressing portion 14 located on the rear side thereof. When the second contact portion 12 is in an open state (see FIGS. 9B and 10B ), the second end portion 322 may be in slight contact with the pressing portion 14 or may be separated from the pressing portion 14 . However, when the second contact portion 12 is in the closed state (see FIGS. 9A and 10A ), the more the handle portion 32A is elastically deformed and bent, the more the second end portion 322 is pressed from the pressing portion 14 , and the handle portion 322 is more fully pressed. The portion 32A is in contact with the conductor 31 . In other words, each handle portion 32A has a contact portion 323 that is brought into contact with the conductor 31 by pressing from the pressing portion 14 . The contact portion 323 corresponds to the above-described movable contact 121 . Since the first torsion spring T1 has two shank portions 32A, it also has two contact portions 323 . The contact portion 323 is located between the first end portion 321 and the second end portion 322 . The first end portion 321 serves as a fulcrum, the second end portion 322 serves as a force point, and the contact portion 323 serves as an action point.

In the present embodiment, the contact mechanism 3 is disposed apart from the first contact portion 11 by a predetermined distance, in addition to the structure of maintaining the energized state of the power supply circuit C2 by contact at a plurality of points. In other words, the contact mechanism 3 is arranged in a place different from the members (the fixed contact plate 110 and the arm 111 ) constituting the first contact portion 11 . Specifically, for example, when viewed along the thickness direction of the body 5 (see FIG. 1 ), the electromagnetic trip device 4A including the main circuit coil 41 and the like is interposed between the first contact portion 11 and the second contact between sections 12.

As described above, in the present embodiment, the contact mechanism 3 maintains the energized state of the power supply circuit C2 by the contact at a plurality of points. Therefore, for example, even if an abnormality such as disconnection of contact at any one of the plurality of points occurs, the remaining contacts are maintained. The probability of point contact is also higher. Therefore, the contact reliability can be improved.

And the contact mechanism 3 is arrange|positioned apart from the 1st contact part 11 by a predetermined distance. As a result, for example, compared with the case where the second contact portion 12 is provided adjacent to the first contact portion 11, the influence of the arc generated when the first contact portion 11 is opened can be reduced (for example, The components constituting the contact mechanism 3 etc. are consumed due to the arc). Therefore, it is possible to improve the reliability of the contact portion (second contact portion 12 ) of the power supply circuit C2 for the sensor (eg, the leak detection portion 2 ). In particular, since the first end 411 of the main circuit coil 41 is electrically connected to the first contact portion 11, and the second end 412 is electrically connected to the branch point P1 where the main circuit C1 branches to the power supply circuit C2, the main circuit coil 41 is interposed between the first end 411 and the second end 412. between the first contact part 11 and the second contact part 12 . Therefore, a configuration in which the contact mechanism 3 is disposed apart from the first contact portion 11 by a predetermined distance can be easily realized.

In addition, in the contact mechanism 3, since the hairspring 32 and the conductor 31 are in contact with each other at a plurality of points, the multi-point contact can be realized with a simple structure. In particular, since the hairspring 32 is a torsion spring (first torsion spring T1 ) here, it is inexpensive and can further improve both the reliability of holding the hairspring 32 of the contact mechanism 3 and the reliability of the multi-point contact.

In addition, each handle portion 32A is held in the body 5 in a state of its natural length so as to be separated from the conductor 31 and the second contact portion 12 to be disconnected. Moreover, in the 1st torsion spring T1, the short shank part located on the opposite side to the shank part 32A with respect to the coil part 32B is in contact with the wall of the body 5. FIG. Then, in a state where each handle portion 32A is pressed and bent, the second contact portion 12 is closed. Therefore, for example, compared with the case where the shank 32A is in contact with the conductor 31 in the state of its natural length and the second contact part 12 is closed, and the second contact part 12 is opened in a state where the shank 32A is pressed and bent , the contact reliability of the second contact portion 12 can be further improved.

(2.9) Leak detection function

Hereinafter, the leakage detection function of the circuit breaker 1 will be described. The leakage detection unit 2 (sensor) has a function of forcibly opening the first contact unit 11 and the second contact unit 12 together with the electromagnetic trip device 4A of the trip mechanism 4 when a leakage current is detected.

Specifically, the leakage detection unit 2 includes a zero-phase current transformer 21 (ZCT: Zero-phase-sequence Current Transformer) that detects a leakage current as a physical quantity, and a control unit 22 that outputs an electrical signal based on the leakage current.

As shown in FIGS. 1 and 2 , the zero-phase current transformer 21 is mounted on the first mounting surface 601 (one mounting surface: upper surface) of the circuit board 6 . The circuit board 6 is housed in the body 5 with a slight inclination in a state of standing up with respect to the bottom wall 56 of the body 5 . A through hole having substantially the same shape and size as the hole in the center of the zero-phase current transformer 21 is formed in the circuit board 6 , and a pair of braided wires D1 (connecting wires) pass through the hole of the zero-phase current transformer 21 and the circuit board 6 through holes. A pair of braided wires D1 constitute part of the main circuit C1.

For one of the pair of braided wires D1, one end is fixedly attached to the second end 412 of the main circuit coil 41 of the first circuit C11, and the other end is fixedly attached to the second terminal portion 7B of the first circuit C11 Terminal board 73. For the other of the pair of braided wires D1, one end is fixedly attached to the fixed contact plate 110 of the first contact part 11 of the second circuit C12, and the other end is fixedly attached to the second contact part 11 of the second circuit C12. The terminal plate 73 of the terminal portion 7B.

The control unit 22 includes, for example, a computer system including a processor and a memory. Then, when the processor executes the program stored in the memory, the computer system functions as the control unit 22 . Here, the program executed by the processor is pre-recorded in the memory of the computer system, but may be provided by being recorded on a recording medium such as a memory card, or provided via a telecommunication line such as the Internet. In addition, the control unit 22 is not limited to a configuration based on a digital IC such as a processor, and may be configured by an analog IC.

The circuit board 6 is, for example, a double-sided printed wiring board, and has a conductor pattern formed of copper foil or the like. A plurality of circuit components constituting various circuit blocks including the control block, excitation block, and power supply block of the control unit 22 are mounted on the first mounting surface 601 or the second mounting surface 602 (lower surface) of the circuit board 6 . In addition, an overvoltage absorbing element Z1 (see FIG. 1 ) is mounted on the circuit board 6 as a varistor for protecting circuit blocks such as the control unit 22 from lightning strikes and the like. The overvoltage absorbing element Z1 is, for example, ZNR (Zinc oxide Nonlinear Resistor).

The control unit 22 receives operating power from the main circuit C1 via the power supply circuit C2. Specifically, the power supply block located on the circuit board 6 converts the AC power received from the power supply circuit C2 into a DC voltage having a predetermined voltage value, and supplies it to the control unit 22 .

Here, in the use of the circuit breaker 1, when no leakage occurs, the magnetic fluxes generated by the round-trip current (current flowing through the first circuit C11 and the second circuit C12) with respect to the load cancel each other out, and the magnetic fluxes from zero The output of the output line 23 (see FIG. 5 ) of the phase inverter 21 becomes zero. On the other hand, when leakage occurs, the currents flowing through the first circuit C11 and the second circuit C12 become unbalanced, and a current according to the degree of unbalance flows through the output line 23 of the zero-phase current transformer 21 . Therefore, the control unit 22 can detect whether or not leakage current (leakage current) occurs based on the output of the zero-phase current transformer 21 . When the leakage current is detected, the control unit 22 causes the excitation block to generate a drive current (excitation current) and make it flow through the leakage current trip coil 42 to cause the trip mechanism 4 to perform a trip operation. In other words, the control unit 22 outputs a drive signal as an electric signal to the leakage trip coil 42 , and the trip mechanism 4 forcibly causes the first contact portion 11 and the second contact portion 11 to contact the second contact portion 11 when the trip mechanism 4 receives the drive signal and a drive current flows through the leakage trip coil 42 . The dot portion 12 is disconnected.

In addition, even when the control unit 22 detects the current flowing through the overvoltage absorbing element Z1 , the control unit 22 forcibly opens the first contact unit 11 and the second contact unit 12 by flowing a drive current to the leakage trip coil 42 . .

(2.10) Test function

Hereinafter, the test function of the circuit breaker 1 will be described. The pseudo-leakage generating unit C4 is configured to flow a pseudo-leakage current through the electric wire W1 passing through the zero-phase current transformer 21 in accordance with the generation of the current flowing through the energization circuit L1 branched from the main circuit C1 to open the first contact portion 11 .

Here, as shown in FIG. 5 , the energization circuit L1 includes the first circuit L11 from the branch point P1 to the connection point P4 including the second contact portion 12 , and the circuit from the connection point P4 to the third contact portion 18 . The second circuit L12 up to the substrate 6 is configured. Among them, the first circuit L11 also serves as a part of the power supply circuit C2. The "current flowing in the energization circuit L1" is generated when all the contact parts (11, 12, 18) are closed. The pseudo-leakage generating portion C4 includes a resistor R1 (see FIGS. 5 , 6A, and 6B ) and a conductor member M1 (see FIG. 7 ). Resistor R1 is inserted into energized circuit L1. As shown in FIGS. 6A and 6B , the resistor R1 is held by the holding structure H1 . Details of the holding structure H1 will be described later.

Among the pair of lead terminals R3 of the resistor R1 , the lead terminal R3 protruding from the front surface of the main body R2 of the resistor R1 is cut in advance near the base to shorten the axis. Hereinafter, this lead terminal R3 may also be referred to as a short-axis lead terminal R31. The lead terminal R31 of the stub shaft is soldered to one end of a wire W1 (see FIG. 5 ) constituting a part of the second circuit L12 of the energization circuit L1 , and the other end of the wire W1 is electrically connected to the conductive pattern on the circuit board 6 . However, like the pair of braided wires D1 , the electric wire W1 passes through the hole in the center of the zero-phase current transformer 21 and the through hole of the circuit board 6 .

On the other hand, among the pair of lead terminals R3 of the resistor R1, the lead terminal R3 protruding from the rear surface of the main body R2 of the resistor R1 is held in the holding structure H1 in a state of being folded back from the main body R2 of the resistor R1. Hereinafter, the lead terminal R3 may also be referred to as the long-axis lead terminal R32. The long-axis lead terminal R32 is a member constituting the fixed contact 181 of the third contact portion 18 .

As an example, the conductor member M1 is a torsion spring (second torsion spring T2). The second torsion spring T2 is formed of, for example, stainless steel (SUS). The second torsion spring T2 has one shank portion T21 and one coil portion T22. In addition, as described above, the second torsion spring T2 is held by the support portion 13 by being fitted into the coil portion T22 by the second protrusion 132 of the substantially U-shaped support portion 13 . The support portion 13 corresponds to the connection point P4 in FIG. 5 .

The shank portion T21 of the second torsion spring T2 is a member constituting the movable contact 182 of the third contact portion 18 . In short, the movable contact 182 (the handle portion T21 ) is brought into contact with the fixed contact 181 (the lead terminal R32 ), so that the third contact portion 18 is closed (see FIG. 11B ), and when the movable contact 182 is separated from the fixed contact 181 , the third contact portion 18 is opened (see FIG. 11A ). The handle portion T21 is arranged so as to be opposed to the exposed central portion of the lead terminal R32 on the rear side thereof. Moreover, the short shank part located on the opposite side to the shank part T21 with respect to the coil part T22 contacts the rib which protrudes from the 2nd block 5B, and is hold|maintained.

Here, the second torsion spring T2 (conductor member M1 ) is connected to the part (central part) exposed from the holding structure H1 in the lead terminal R32 according to the operation of the operation part B1 by the tester who performs the operation test of the circuit breaker 1 . ) contacts to switch the energization circuit L1 from the off state to the energized state.

The operation unit B1 is configured to receive operations from the outside. As shown in FIG. 7 , the operation portion B1 is formed in a block shape from a synthetic resin material having electrical insulating properties. The operation part B1 is supported by the container body 5 so that the protrusion part B10 thereof protrudes to the outside of the container body 5 from an exposure window 550 (refer to FIG. 3 ) provided in the front wall 55 of the container body 5 .

The shank portion T21 of the second torsion spring T2 is located at a position separated from the lead terminal R32 in the state of its natural length, and is pressed backward by the protruding portion B10 of the operation portion B1 by the tester's fingertip or the like to receive pressure from the operation portion B1. Specifically, as shown in FIG. 7 , the operation part B1 has a main body part B11 accommodated in the body 5 . The main body portion B11 and the protruding portion B10 are integrally formed. The main body portion B11 has a substantially V-shaped groove portion B12 at the lower end thereof. The handle part T21 is arrange|positioned so that it may be accommodated in the groove part B12. Then, by pressing the protrusion B10 rearward, the bottom of the groove B12 is pressed rearward to the central portion of the shank portion T21 in the axial direction. As a result, the shank portion T21 is bent so as to be bent by elastic deformation, and the shank portion The tip portion of T21 is in contact with lead terminal R32.

Therefore, in the use of the circuit breaker 1, when the contact parts (11, 12) are in the closed state, when the tester performs the opening of the contact parts (11, 12) by the trip mechanism 4, is it normal? When the operation part B1 is pressed for the test, the third contact part 18 is closed. As a result, the energization circuit L1 is switched from the off state to the energization state. Then, due to the occurrence of the current flowing through the electric wire W1 passing through the zero-phase current transformer 21 , a current corresponding to the degree of imbalance flows through the output wire 23 of the zero-phase current transformer 21 . The control unit 22 determines the occurrence of leakage (leakage current) based on the output of the zero-phase current transformer 21 (detection of a suspected leakage current), and flows a drive current to the leakage trip coil 42 via the excitation block to forcibly make the contact parts (11, 11, 12) Disconnect. Thereby, when the circuit breaker 1 is normal, the contact parts (11, 12) are tripped.

In the present embodiment, as described above, the lead terminal R32 of the resistor R1 constitutes the third contact portion 18 together with the conductor member M1. In other words, since the lead terminal R32 also functions as the fixed contact 181, it is possible to share the components.

(2.11) Holding structure

Hereinafter, the holding structure H1 will be described. The holding structure H1 has a block shape and is configured to hold the resistor R1. The holding structure H1 is, for example, a single molded product formed of an electrically insulating synthetic resin material. As shown in FIGS. 6A and 6B , the holding structure H1 has a housing portion H10 into which the resistor R1 is inserted, for example, from the right side and holds the resistor R1 . The accommodating part H10 has a substantially cylindrical shape, and has through-holes H11 whose both ends in the front-rear direction are open. The cylindrical body R2 of the resistor R1 is inserted into the through hole H11 of the housing portion H10 along the front-rear direction. The outer diameter of the main body R2 is slightly smaller than the inner diameter of the through hole H11, and the main body R2 is fixed to the holding structure H1 by, for example, press fitting.

The holding structure H1 holds the resistor R1 so that the axis of the main body R2 of the resistor R1 is along the thickness direction of the body 5 . Therefore, when viewed from the thickness direction of the body 5 , the proportion occupied by the body R2 of the resistor R1 in the interior of the body 5 can be reduced.

The lead terminal R31 of the short axis of the resistor R1 is exposed from the front of the housing portion H10. On the other hand, the lead terminal R32 of the long axis is folded back so as to sandwich the upper wall of the holding structure H1 between the main body R2 (see FIG. 6B ). Specifically, the lead terminal R32 is inserted from the front end on the right side of the accommodating portion H10 to the front in a state in which the rear surface of the main body R2 is bent at a right angle to the front and further bent at a right angle to the left side twice in total. Protruding ledge H12 hole. Since the lead terminal R32 is held in the holding structure H1 in a folded state, for example, the lead terminal R32 is less likely to become a obstacle.

Most of the lead terminals R32 are parallel to the axis of the main body R2 in front of the main body R2. The distal end of the lead terminal R32 is inserted into and held in the hole of the projection H13 protruding forward from the distal end of the left side of the housing portion H10 while being bent upward at a right angle.

Most of the lead terminal R32 parallel to the axis of the main body R2 is exposed between the bosses H12 and H13. In other words, the holding structure H1 holds the resistor R1 in a state where the lead terminal R32 of the resistor R1 is partially exposed.

As described above, in the present embodiment, the circuit breaker 1 has a block shape and includes the holding structure H1 for holding the resistor R1 , so that miniaturization can be achieved and ease of positioning of the resistor R1 can be improved. Moreover, since the holding structure H1 has the accommodating part H10 into which the resistor R1 is inserted and holds the resistor R1, the workability regarding the assembling operation of the resistor R1 with respect to the holding structure H1 at the time of manufacture of the circuit breaker 1 is improved.

In addition, since the holding structure H1 holds the resistor R1 in a state where each of the lead terminals R31 and R32 is partially exposed, it is possible to suppress a decrease in stability related to the holding of the resistor R1. In addition, it is possible to improve the ease of contact between the second torsion spring T2 and the lead terminal R32 and the operability of connection work (for example, a work such as soldering connection) to the lead terminal R31.

In addition, the holding structure H1 that holds the resistor R1 is configured to also hold the fixed contact 122 of the second contact portion 12 . In other words, as shown in FIGS. 6A and 6B , the holding structure H1 also holds the conductor 31 that is a member constituting the fixed contact 122 .

The holding structure H1 further includes a pair of holding protrusions H14 for exposing the center of the long-axis portion 310 of the conductor 31 and holding both ends in the left-right direction of the long-axis portion 310 of the conductor 31 . The pair of holding protrusions H14 protrudes rearward from the rear ends on the left and right sides of the accommodating portion H10, respectively. Each holding protrusion H14 has a through hole for holding both ends in the left-right direction of the long-axis portion 310 of the conductor 31 by being inserted from the left.

In this way, since the holding structure H1 holds not only the resistor R1 but also the conductor 31 (fixed contact 122 ), the common components can be shared and the ease of positioning of the fixed contact 122 can be improved.

In addition, in the present embodiment, the holding structure H1 holds the resistor R1 such that the main body R2 of the resistor R1 is disposed between the lead terminal R32 of the resistor R1 and the conductor 31 (fixed contact 122 ) in the front-rear direction. Therefore, the lead terminal R32 in contact with the second torsion spring T2 (conductor member M1 ) and the conductor 31 (fixed contact 122 ) in contact with the shank 32A (movable contact 121 ) of the first torsion spring T1 are separated by the main body R2 open, thus reducing the possibility of mutual interference.

In particular, in the present embodiment, the second contact part 12 has a torsion spring (first torsion spring T1 ), the torsion spring has the movable contact 121 , and the third contact part 18 also has a torsion spring (second torsion spring T1 ). A torsion spring T2), which has a movable contact 182. Therefore, it is inexpensive and the reliability of the contact with the fixed contacts (122, 181) can be improved.

In addition, as shown in FIGS. 8A and 8B , the container body 5 has a holding portion 50 that holds the holding structure H1 . As an example, the holding portion 50 has a T-shaped protrusion 50A, a first boss 50B, and a second boss 50C. The T-shaped protrusion 50A and the first boss 50B are provided on the left wall 59A of the container body 5 . The T-shaped protrusion 50A and the first boss 50B protrude toward the right wall 59B from the inner surface of the left wall 59A. The second boss 50C protrudes toward the left wall 59A from the inner surface of the right wall 59B.

The T-shaped protrusion 50A is configured to be able to fit into the T-shaped groove H130 formed in the protrusion H13 of the holding structure H1 from the left. The first boss 50B is configured to be able to fit into the through hole H11 of the housing portion H10 of the holding structure H1 from the left in a state where the resistor R1 is held by the holding structure H1. In addition, the holding structure H1 has a recess H15 through which the electric wire W1 to be soldered to the lead terminal R31 of the stub shaft is retracted in a state where the first boss 50B is fitted into the through hole H11 (refer to FIGS. 6A and 6B ) .

The second boss 50C is configured to be able to fit into the through hole H11 of the housing portion H10 of the holding structure H1 from the right in a state where the resistor R1 is held by the holding structure H1 . The second boss 50C has a groove 50D through which the lead terminal R32 of the resistor R1 is retracted.

In this way, the device body 5 has the holding portion 50 , so that it is possible to improve the easiness related to the positioning of the holding structure H1 with respect to the device body 5 .

(2.12) About the reverse connection state

As described above, the circuit breaker 1 can also be used in the reverse connection state.

In addition, consider the case where the circuit breaker 1 does not have the second contact portion 12 and the second power supply line C22 is connected to the connection point P7 (see the virtual line X1 in FIG. 5 ). When the circuit breaker 1 is connected in a reverse connection state, that is, when the pair of electric wires 103 on the power supply side is connected to the pair of second terminals 72 and the pair of electric wires 104 on the load side is connected to the pair of first terminals 71, even during the leakage detection After the first contact part 11 is opened, there is a possibility that the control part 22 continues to operate. Specifically, an existing current flows through the second terminal 72 of the first circuit C11 and the branch point P1, and further flows through the first power supply line C21 of the power supply circuit C2 to reach the circuit board 6, and from the second power supply line C22 to the connection point P7 , the possibility that the second terminal 72 of the second circuit C12 flows. Furthermore, even if the first contact part 11 is opened, the control part 22 obtains the operating power, and therefore it is assumed that a drive current flows to the leakage trip coil 42 every time the operation part B1 for the test is pressed.

Since such a situation is not desirable, in the present embodiment, a configuration is adopted in which the second power supply line C22 is connected to the connection point P3. However, if the circuit breaker 1 still does not have the second contact portion 12 , when a grounding or the like occurs on one side of the load, the current flowing through the pair of braided wires D1 becomes unbalanced, and there is a zero-phase current transformer 21 . It is possible for the output line 23 to flow a current corresponding to the degree of unbalance. Furthermore, even if the first contact portion 11 is turned off, the control portion 22 obtains the operating power, so that the drive current can continue to flow to the leakage trip coil 42 . In short, if the circuit breaker 1 does not have the second contact part 12 , when the circuit breaker 1 is connected in a reverse connection state, there is a possibility that the leakage trip coil 42 may burn out. In addition, there is a possibility that the load side has a potential.

On the other hand, in the circuit breaker 1, the second power supply line C22 is connected to the connection point P3, and the circuit breaker 1 has the second contact portion 12, so that the possibility of burning out the leakage trip coil 42 and the possibility of the electric leakage on the load side can be reduced. Possibility of potential. Moreover, since the 2nd contact part 12 has the contact mechanism 3 which maintains the energized state of the power supply circuit C2 by contact of a plurality of points, reliability can be improved.

(3) Modifications

The above-described embodiment is only one of various embodiments of the present disclosure. The above-described embodiment can be variously changed in accordance with design and the like as long as the object of the present disclosure can be achieved. In addition, the same function as the circuit breaker 1 of the above-described embodiment can be realized by a control method of the circuit breaker 1, a computer program, or a non-transitory recording medium in which the computer program is recorded.

Hereinafter, modifications of the above-described embodiment will be listed. The modifications described below can be applied in combination as appropriate. Hereinafter, the above-described embodiment may also be referred to as a "basic example".

The control unit 22 of the circuit breaker 1 of the present disclosure includes a computer system. A computer system has a processor and a memory as hardware as its main structures. When the processor executes the program recorded in the memory of the computer system, the function of the control unit 22 as the circuit breaker 1 of the present disclosure is realized. The program may be pre-recorded in the memory of the computer system, provided via a telecommunication line, or provided by being recorded on a non-transitory recording medium such as a memory card, optical disk, and hard disk drive that can be read by the computer system. A processor of a computer system consists of one or more electronic circuits including semiconductor integrated circuits (ICs) or large scale integrated circuits (LSIs). The integrated circuits such as IC and LSI mentioned here have different names depending on the degree of integration, and include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). In addition, as the processor, an FPGA (Field-Programmable Gate Array) programmed after the LSI is manufactured, or a logical disk capable of reconfiguring the bonding relationship within the LSI or reconfiguring the circuit division within the LSI can also be used. A plurality of electronic circuits may be integrated into one chip, or may be distributed over a plurality of chips. A plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Thus, the microcontroller is also composed of one or more electronic circuits including semiconductor integrated circuits or large scale integrated circuits.

In addition, in the circuit breaker 1, a structure in which a plurality of functions of the circuit breaker 1 are integrated in one case is not necessarily a structure, and the components of the circuit breaker 1 may be distributed in a plurality of cases. In addition, at least a part of the function of the circuit breaker 1, for example, the part of the function of the circuit breaker 1 may be realized by cloud (cloud computing) or the like. Conversely, as in the basic example, a plurality of functions of the circuit breaker 1 may be integrated into one housing.

In the basic example, all of the four terminal portions 7 are screw terminals, but it is not particularly limited. At least one of the four terminal parts 7 may be a terminal part of a so-called quick-connect structure that can be wired without using a screw.

In the basic example, the hairspring 32 is a torsion spring (first torsion spring T1 ), but for example, the coil portion 32B may not be provided and may be constituted by only one or more shank portions 32A.

Similarly, in the basic example, the conductor member M1 is the torsion spring (the second torsion spring T2 ), but for example, the coil portion T22 may not be provided, and only the shank portion T21 may be formed. In addition, the conductor member M1 may be a double torsion spring like the first torsion spring T1. In other words, the conductor member M1 may have a structure in which it is in contact with the lead terminals R32 of the resistor R1 at a plurality of points.

(4) Summary

As described above, the circuit breaker 1 of the first aspect includes the resistor R1 , the holding structure H1 , and the body 5 . The holding structure H1 has a block shape and holds the resistor R1. The container 5 accommodates at least the resistor R1 and the holding structure H1 described above. According to the first aspect, miniaturization can be achieved, and the ease of positioning of the resistor R1 can be improved.

Regarding the circuit breaker 1 of the second aspect, in addition to the first aspect, it is preferable that the holding structure H1 has a housing portion H10 into which the resistor R1 is inserted and holds the resistor R1. According to the second aspect, the workability related to the assembling operation of the resistor R1 with respect to the holding structure H1 is improved.

In the circuit breaker 1 of the third aspect, in addition to the first aspect or the second aspect, it is preferable that the holding structure H1 holds the resistor R1 in a state where at least part of the lead terminal R3 of the resistor R1 is exposed. According to the third aspect, it is possible to suppress a decrease in the stability related to the holding of the resistor R1 , and, for example, the ease of contact with the lead terminal R3 or the operation of connection to the lead terminal R3 (for example, work such as solder connection) can be realized. Sexual enhancement.

Regarding the circuit breaker 1 of the fourth aspect, in addition to the third aspect, it is preferable that the lead terminal R3 is held in the holding structure H1 in a state of being folded back from the main body R2 of the resistor R1. According to the fourth aspect, the lead terminal R3 is less likely to become an obstacle in the body 5 than when the resistor R1 is held by the holding structure H1 in a state where the lead terminal R3 is straight with respect to the main body R2, for example.

With regard to the circuit breaker 1 of the fifth aspect, in addition to any one of the first aspect to the fourth aspect, it is preferable that the circuit breaker 1 further includes a leakage detection unit 2 including a zero-phase inversion current for detecting leakage current The device 21; the contact part (the first contact part 11); and the pseudo-leakage generating part C4. The contact portion (the first contact portion 11 ) is opened in response to the occurrence of the leakage current, and the main circuit C1 is switched from the energized state to the disconnected state. The pseudo-leakage generating portion C4 flows a pseudo-leakage current to the electric wire W1 passing through the zero-phase current transformer 21 in accordance with the generation of the current passing through the energization circuit L1 branched from the main circuit C1, so that the contact portion (the first contact portion 11 ) is opened. open. The body 5 also accommodates the zero-phase current transformer 21 , the contact portion (the first contact portion 11 ), and the pseudo-leakage generating portion C4 . Resistor R1 is inserted into energized circuit L1. According to the fifth aspect, for example, in the circuit breaker 1 capable of generating a leakage current simulated for testing, it is possible to achieve miniaturization and to improve the ease of positioning of the resistor R1 .

Regarding the circuit breaker 1 of the sixth aspect, in addition to the fifth aspect, it is preferable that the circuit breaker 1 further includes: an operation part B1 that receives an operation from the outside; and a conductor member M1. The holding structure H1 holds the resistor R1 in a state where at least a part of the lead terminal R3 of the resistor R1 is exposed. The conductor member M1 is brought into contact with the exposed part of the lead terminal R3 in accordance with the operation of the operation portion B1, and the energization circuit L1 is switched from the disconnected state to the energized state. According to the sixth aspect, for example, the tester can easily simulate the generation of leakage current by operating the operation part B1. Furthermore, the lead terminal R3 of the resistor R1 constitutes a contact portion (third contact portion 18 ) together with the conductor member M1 . In other words, since the lead terminal R3 also functions as a fixed contact, common use of components can be achieved.

Regarding the circuit breaker 1 of the seventh aspect, in addition to the sixth aspect, it is preferable that the conductor member M1 is a torsion spring (second torsion spring T2). According to the seventh aspect, the reliability of contact with the lead terminal R3 can be improved at low cost.

Regarding the circuit breaker 1 of the eighth aspect, in addition to any one of the fifth aspect to the seventh aspect, it is preferable that the circuit breaker 1 further includes the second contact portion 12 , the trip mechanism 4 , and the control portion 22 . The second contact portion 12 is disconnected in conjunction with the disconnection of the first contact portion 11 , which is the above-described contact portion, and switches the power supply circuit C2 branched from the main circuit C1 from the energized state to the disconnected state. The trip mechanism 4 has an earth leakage trip coil 42 . The control unit 22 flows a drive current to the leakage trip coil 42 based on the leakage current detected by the zero-phase current transformer 21 . The trip mechanism 4 opens the first contact portion 11 and the second contact portion 12 when a drive current flows to the leakage trip coil 42 . The control unit 22 receives operating power from the main circuit C1 via the power supply circuit C2. The 2nd contact part 12 has the movable contact 121, and the fixed contact 122, which is closed by contacting the movable contact 121, and is opened by being separated from the movable contact 121. The holding structure H1 also holds the fixed contact 122 . According to the eighth aspect, since the holding structure H1 holds not only the resistor R1 but also the fixed contact 122 , it is possible to share components and to improve the ease of positioning the fixed contact 122 .

Regarding the circuit breaker 1 of the ninth aspect, in addition to the eighth aspect, it is preferable that the holding structure H1 is arranged such that the main body R2 of the resistor R1 is arranged between the lead terminal R3 of the resistor R1 and the fixed contact 122 Hold resistor R1. According to the ninth aspect, the lead terminal R3 in contact with the conductor member M1 and the fixed contact 122 in contact with the movable contact 121 are separated by the main body R2, so that the possibility of mutual interference can be reduced.

In the circuit breaker 1 of the tenth aspect, in addition to the eighth aspect or the ninth aspect, it is preferable that the second contact portion 12 has a torsion spring (first torsion spring T1 ) having a movable contact 121. According to the tenth aspect, the reliability of the contact with the fixed contact 122 can be improved at low cost.

Regarding the circuit breaker 1 of the eleventh aspect, in addition to any one of the first aspect to the tenth aspect, it is preferable that the body 5 has the holding portion 50 that holds the holding structure H1. According to the eleventh aspect, it is possible to improve the ease of positioning the holding structure H1 with respect to the body 5 .

Regarding the circuit breaker 1 of the twelfth aspect, in addition to any one of the first aspect to the eleventh aspect, it is preferable that the body 5 has a flat box shape. The holding structure H1 holds the resistor R1 so that the axis of the main body R2 of the resistor R1 is along the thickness direction of the body 5 . According to the twelfth aspect, when viewed from the thickness direction of the body 5 , the proportion of the body R2 of the resistor R1 occupied in the interior of the body 5 can be reduced.

The configurations of the second to twelfth aspects are not required for the circuit breaker 1 and can be appropriately omitted.

Claims (12)

1. A circuit breaker, wherein,

the circuit breaker includes:

a resistor;

a holding structure which is in a block shape and holds the resistor; and

and a body that houses at least the resistor and the holding structure.

2. The circuit breaker of claim 1,

the holding structure has a housing portion into which the resistor is inserted and holds the resistor.

3. The circuit breaker of claim 1 or 2,

the holding structure holds the resistor in a state where at least a part of the lead terminals of the resistor is exposed.

4. The circuit breaker of claim 3,

the lead terminal is held by the holding structure in a state of being folded back from the main body of the resistor.

5. The circuit breaker of claim 1 or 2,

the circuit breaker further comprises:

a leakage detection unit including a zero-phase current transformer for detecting a leakage current;

a contact unit that is disconnected in response to the occurrence of the leakage current and switches the main circuit from a current-carrying state to a disconnected state; and

a simulated leakage current generation unit that causes a simulated leakage current to flow through a wire passing through the zero-phase current transformer in response to generation of a current through a current-carrying circuit branched from the main circuit, and opens the contact unit,

the body further houses the zero-phase current transformer, the contact portion, and the simulated leakage generating portion,

the resistor is inserted into the power-on circuit.

6. The circuit breaker of claim 5,

the circuit breaker further comprises:

an operation unit that receives an operation from the outside; and

a conductor member is provided on the outer surface of the conductor member,

the holding structure holds the resistor in a state where at least a part of the lead terminals of the resistor is exposed,

the conductor member is brought into contact with the exposed partial portions of the lead terminals in accordance with an operation performed on the operation portion, and switches the energizing circuit from a cut-off state to an energizing state.

7. The circuit breaker of claim 6,

the conductor member is a torsion spring.

8. The circuit breaker of claim 5,

the circuit breaker further comprises:

a 2 nd contact unit that is disconnected in conjunction with disconnection of the 1 st contact unit that is the contact unit, and switches a power supply circuit branched from the main circuit from an energized state to a disconnected state;

a trip mechanism having a leakage trip coil; and

a control unit for supplying a drive current to the earth leakage trip coil based on the leakage current detected by the zero-phase current transformer,

the trip mechanism opens the 1 st contact part and the 2 nd contact part when the driving current flows to the earth leakage trip coil,

the control unit receives operating power from the main circuit via the power circuit,

the 2 nd contact part has:

a movable contact; and

a fixed contact that is closed by being brought into contact with the movable contact and is opened by being separated from the movable contact,

the holding structure also holds the fixed contact.

9. The circuit breaker of claim 8,

the holding structure holds the resistor such that the main body of the resistor is disposed between the lead terminal of the resistor and the fixed contact.

10. The circuit breaker of claim 8,

the 2 nd contact point portion has a torsion spring having the movable contact point.

11. The circuit breaker of claim 1 or 2,

the body has a holding portion for holding the holding structure.

12. The circuit breaker of claim 1 or 2,

the body is in the shape of a flat box,

the holding structure holds the resistor such that an axis of a main body of the resistor is along a thickness direction of the body.

Images