KR20230006385A - Thermal overload relay - Google Patents

Abstract

The present invention relates to a thermal overload relay of a two-element structure protected from overload, capable of amplifying and delivering the displacement of a shifter to a reversal mechanism. In accordance with the present invention, a bimetal (21) is curved when heated. The shifter (22) is pressed by the bimetal (21) to be displaced, when the bimetal (21) is curved. A lever (23) is supported by a support shaft (63) to be rotatable, and pressed by the shifter (22), when the shifter (22) is displaced. A reversal mechanism (24), when the lever (23) is rotated, is pressed from a position outward in a diameter direction more than the position of being pressed by the shifter (22) among the levers (23), thereby reversing a contact point.

Description

Thermal Overload Relay {THERMAL OVERLOAD RELAY}

The present invention relates to a thermal overload relay.

A thermal overload relay (thermal relay) protects a main circuit from overload by performing a trip operation by bending a bimetal due to heat when an overcurrent continues to flow, and shutting off an electromagnetic contactor or circuit breaker. As shown in Patent Literature 1, in a thermal overload relay, when a bimetal is heated and curved, a reversing mechanism is operated by pressing a shifter to enter a trip state.

Patent Document 1: Japanese Unexamined Patent Publication No. 2014-107023

Thermal overload relays include a 1E (one element) type that protects against overload and a 2E (two element) type that protects against overload and phase loss. The 1E type generally has a 2-element structure with bimetals in 2 phases of U·W, and the 2E type has a 3-element structure with bimetals in 3 phases of U·V·W. That is, since the number of elements in the 2-element structure is smaller than that of the 3-element structure, the amount of displacement of the shifter is reduced accordingly.

An object of the present invention is to amplify the amount of displacement of a shifter and transmit it to a reversing mechanism in a thermal overload relay having a two-element structure that protects against overload.

A thermal overload relay according to one aspect of the present invention is a two-element thermal overload relay that protects against overload, comprising: a bimetal that curves when heated, and a shifter that is pushed and displaced by the bimetal when the bimetal curves, A lever that is rotatably supported by a support shaft and is pressed and rotated by the shifter when the shifter is displaced, and when the lever is rotated, the lever is pressed from a position radially outside the position pressed by the shifter among the levers, thereby inverting the contact point Equipped with an inversion mechanism.

According to the present invention, when the bimetal is curved, since the reversing mechanism is pressed from a position radially outside of the position pressed by the shifter among the levers, the amount of displacement of the shifter can be amplified and transmitted to the reversing mechanism.

1 is a view showing a thermal overload relay.
Fig. 2 shows a shifter and a lever;
3 is a view showing a case;
4 is a view showing a shifter;
5 is a perspective view showing a lever;
Fig. 6 is a projected view showing a lever;
Fig. 7 is a diagram explaining the operation of a shifter and a lever;
8 is a diagram showing a comparative example.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing. In addition, each drawing is a typical thing, and may differ from an actual thing. In addition, the following embodiment illustrates the apparatus and method for embodying the technical idea of this invention, and does not specify a structure to the following. That is, various changes can be made to the technical idea of the present invention within the technical scope described in the claims.

<< one embodiment >>

"composition"

In the following description, three directions orthogonal to each other are referred to as a longitudinal direction, a width direction, and a depth direction for convenience.

1 is a view showing a thermal overload relay.

The thermal overload relay 11, also called a thermal relay, trips when an overcurrent continues to flow and cuts off an electromagnetic contactor not shown to protect the main circuit from overload. The thermal overload relay 11 has a 1E (one element) type that protects against overload, and a 2E (two element) type that protects against overload and phase loss. Here, the 1E type is used. The drawing shows the inside of the case 12 in the thermal overload relay 11 when a cover (not shown) is removed and viewed from the other side in the vertical direction.

Inside the case 12, a bimetal 21, a shifter 22, a lever 23, a reversal mechanism 24, and a reset rod 25 are provided. The thermal overload relay 11 has a two-element structure having bimetals 21 in two phases of U and W.

The bimetal 21 extends in the depth direction and is formed in a plate shape along the longitudinal and depth directions, the front side in the depth direction is a fixed end, and the rear side is a free end. The front side of the bimetal 21 in the depth direction is connected to the main terminal, and the rear side in the depth direction is joined to one end of the heater 26 . The heater 26 is wound around the bimetal 21, and the other end is joined to the connection terminal 27 on the front side in the depth direction. The connecting terminal 27 is connected to an electromagnetic contactor not shown. The bimetal 21 is normally straight, but when overloaded, the free end side curves to the other side in the width direction, and the shifter 22 is pressed.

The shifter 22 is an insulator, is formed in a flat plate shape along the width direction and the longitudinal direction, and is supported by the case 12 in a state in which it can move forward and backward in the width direction. The shifter 22 is engaged with the free end of the bimetal 21 and is normally located on one side in the width direction, but when overloaded, the bimetal 21 bends to displace to the other side in the width direction. The shifter 22 is formed by coating the surface of the substrate with a solid lubricant in order to reduce the friction coefficient of the surface.

The lever 23 is integrally molded of an electrically insulative resin, extends in the longitudinal direction, and amplifies the amount of displacement of the shifter 22 when an overload state is detected and transmits it to the reversing mechanism 24 .

The reversing mechanism 24 is a mechanism for inverting the contacts when an overload is detected, that is, closing the contact a and opening the contact b, the compensating bimetal 31, the release lever 32, and the tension spring 33 ), a movable plate 34, a leaf spring 35, and an interlocking plate 36. Since the inversion mechanism 24 is not a main component of the embodiment, an outline thereof will be described.

The compensating bimetal 31 extends in the depth direction and is formed in a flat plate shape along the depth direction and the longitudinal direction, the front side in the depth direction is fixed to the release lever 32, and the rear side in the depth direction has a free end. and is engaged with the lever 23.

The release lever 32 extends in the depth direction, is formed in a plate shape along the depth direction and the longitudinal direction, is rotatably supported by a support shaft along the longitudinal direction, and has a tension spring 33 on the rear side in the depth direction. ) are in contact.

The tension spring 33 tensions the movable plate 34 backward in the depth direction.

The movable plate 34 is a flat plate along the depth direction and the longitudinal direction, and the front side in the depth direction is displaceable in the width direction with the rear side in the depth direction serving as a fulcrum. The position where the movable plate 34 is upright becomes a dead point, and when a force is applied to one side or the other side in the width direction, the tensile force of the tension spring 33 inclines it to one side or the other side in the width direction. . And normally, it inclines to one side of the width direction, but when an overload condition occurs, it inclines to the other side of the width direction by being pressed by the release lever 32 through the compensating bimetal 31. The rear side of the movable plate 34 in the depth direction is connected to one of the auxiliary terminals, and a movable contact is formed on the front side in the depth direction.

The plate spring 35 extends in the depth direction and is flat in the depth direction and longitudinal direction, the rear side in the depth direction is connected to the other side of the auxiliary terminal, and the front side in the depth direction facing the movable plate 34 A fixed contact is formed on the side. Normally, the movable contact of the movable plate 34 is separated from the fixed contact of the plate spring 35, but when an overload condition occurs, the movable plate 34 tilts to the other side in the width direction, so that the plate spring 35 The movable contact of the movable plate 34 contacts the fixed contact of ). These stationary contacts and movable contacts constitute the a contact, which is in a trip state when the a contact is closed.

The interlocking plate 36 is formed in a plate shape along the width direction and the depth direction, is supported so as to be able to rotate by a support shaft along the longitudinal direction, and is engaged with the movable plate 34 at the rear side in the depth direction. The interlocking plate 36 rotates in conjunction with the movable plate 34 to open and close the contact on the back side of the interlocking plate 36 (not shown). That is, although the movable contact is in contact with the fixed contact at normal times, when an overload condition occurs, the movable contact is separated from the fixed contact by the rotation of the interlocking plate 36 . These fixed contacts and movable contacts constitute a b contact, and when the b contact is opened, it enters a trip state.

The reset rod 25 is an operator for restoring from a tripped state, is formed in a substantially cylindrical shape with the depth direction being the axial direction, and is disposed on the other side in the longitudinal direction and the other side in the width direction of the case 12. has been The reset rod 25 is supported on the case 12 in a state in which it can be displaced in the depth direction and rotated axially, and is moved to the front side in the depth direction by a plate spring 47 extending in the longitudinal direction. are under pressure The reset bar 25 has an initial position, a manual reset position, and an automatic reset position. The initial position is a position where the front side in the depth direction protrudes from the case 12 . The manual reset position is a position that is only pushed backward in the depth direction from the initial position. The automatic reset position is a position in which the position in the depth direction is maintained by being pressed from the initial position to the rear side in the depth direction and turning clockwise by about 90 degrees as viewed from the front side in the depth direction.

When the reset rod 25 is pressed backward in the depth direction in a tripped state, the plate spring 35 and the movable plate 34 are pressed in one direction in the width direction by the rear end in the depth direction. When the overload condition is resolved, the contact a is opened again and the contact b is closed. On the other hand, when the reset rod 25 is pushed to the rear side in the depth direction in the tripped state and is turned clockwise by about 90 degrees as viewed from the front side in the depth direction, the reset rod 25 is positioned in the depth direction maintain. Then, since the plate spring 35 and the movable plate 34 are pressed to one side in the width direction by the rear end in the depth direction, when the overload state is eliminated, the a contact is automatically opened again, b Close the contact.

Next, the structures of the shifter 22 and the lever 23 will be described.

2 is a diagram showing a shifter and a lever.

Here, the case 12 is shown as viewed from the other side in the longitudinal direction, one side in the width direction, and the rear side in the depth direction.

3 is a diagram showing a case.

Here, the case 12 is shown as viewed from the other side in the longitudinal direction, one side in the width direction, and the rear side in the depth direction. Inside the case 12, partition walls 41 to 43 and a girder plate 44 are formed.

The partition walls 41 to 43 are sequentially arranged from one side in the width direction to the other side, extend in the depth direction, and are formed in a plate shape along the depth direction and the longitudinal direction. On one side of the width direction in the partition wall 41, the U-shaped bimetal 21 and the connection terminal 27 are arrange|positioned. Between the partition wall 41 and the partition wall 42, the V-phase connection terminal 27 is arrange|positioned. Between the partition wall 42 and the partition wall 43, the W-phase bimetal 21 and the connection terminal 27 are arrange|positioned. On the other side of the width direction in the partition wall 43, the inversion mechanism 24 is arrange|positioned. In the partition walls 41 to 43, a substantially cylindrical projection 45 convex toward the rear side in the depth direction is formed on the other side in the longitudinal direction of the cross section on the rear side in the depth direction, and three The protrusions 45 are arranged in a straight line along the width direction. Only the projection 45 of the partition wall 42 has a head portion protruding to the other side in the width direction, which is the rear side in the depth direction.

In the partition walls 41 to 43, substantially cylindrical protrusions 45 convex toward the rear side in the depth direction are formed on one side in the longitudinal direction of the cross section on the rear side in the depth direction. Again, only the projection 45 of the partition wall 42 has a head portion protruding to the other side in the width direction, which is the rear side in the depth direction. The protrusion 45 provided on one side in the longitudinal direction is fitted with a shifter when the 1E type or 2E type having a three-element structure having a bimetal also in the V phase is employed. Therefore, the case 12 is common to the 1E type and 2E type of the three-element structure.

The girder plate 44 is disposed on the rear side in the depth direction, extends in the width direction, and is formed in a plate shape along the width direction and the longitudinal direction. In the girder plate 44, it is on the other side in the width direction than the partition wall 43, and in the edge portion on the other side in the longitudinal direction, it is recessed toward one side in the longitudinal direction and becomes substantially U-shaped when viewed in the depth direction. Grooves 46 are formed.

4 is a diagram showing a shifter.

The shifter 22 is a substantially rectangular flat plate with long sides in the width direction and short sides in the longitudinal direction. In the shifter 22, on one side in the width direction, a long hole 51 extending in the width direction and fitted with the projection 45 of the partition wall 41 is formed. In the shifter 22, on the other side in the width direction, a long hole 52 is formed that extends in the width direction and fits the projection 45 of the partition 42 and the projection 45 of the partition 43. . The long hole 52 has a different size in the longitudinal direction on one side and the other side in the width direction, and one side in the width direction is larger than the head of the projection 45 in the partition 42, and the other side in the width direction The side is smaller than the head of the projection 45 in the partition wall 42 . In the shifter 22, the long hole 51 is fitted to the protrusion 45 of the partition 41, and the long hole 52 is connected to the protrusion 45 of the partition 42 and the projection 45 of the partition 43. By fitting to, it becomes possible to displace along the width direction. When there is a projection 45 of the partition 42 on one side of the width direction in the long hole 52, the shifter 22 can be removed. When there is a projection 45 of the partition wall 42 on the other side of the width direction of the long hole 52, the head of the projection 45 is prevented from coming off, and the shifter 22 cannot be removed.

Engagement pieces 53 to 55 are formed on one side of the shifter 22 in the longitudinal direction. The engaging piece 53 is disposed on one side in the width direction rather than the partition wall 41, and protrudes toward one side in the width direction after facing one side in the longitudinal direction. Among the engaging pieces 53, the free end of the bimetal 21 in the U phase is engaged with the front end facing one side in the width direction. The engagement piece 54 is disposed between the barrier rib 41 and the barrier rib 42, and protrudes toward one side in the width direction after facing one side in the longitudinal direction. The engaging piece 55 is disposed on the other side of the width direction rather than the partition wall 43, and protrudes toward one side of the width direction and the other side after facing one side of the longitudinal direction. Among the engaging pieces 53, the free end of the bimetal 21 in the W phase is engaged with the tip facing one side in the width direction, and the lever 23 is attached to the tip 56 facing the other side in the width direction. is set on foot

In the case of adopting the 1E type of 3-element structure, the free end of the bimetal in the V phase is engaged with the front end facing one side in the width direction among the engaging pieces 54. Therefore, the shifter 22 is common with the 1E type of 3-element structure.

5 is a perspective view showing a lever.

(a) in the drawing shows a state in which the lever 23 is viewed from the other side in the longitudinal direction, one side in the width direction, and the rear side in the depth direction, and (b) in the drawing shows the lever 23 in the longitudinal direction. The states seen from one side, the other side in the width direction, and the front side in the depth direction are shown.

6 is a projected view showing a lever.

(a) in the figure shows a state in which hidden lines are displayed when the lever 23 is viewed from the rear side in the depth direction, and (b) in the figure shows a state in which the lever 23 is viewed from the other side in the width direction. (c) in (b) shows the A-A cross section.

A pair of opposing plates 61 and 62 are formed on one side of the lever 23 in the longitudinal direction. The counter plates 61 and 62 are formed in a flat plate shape along the longitudinal and width directions, face each other while being spaced apart in the depth direction, and are connected by a cylindrical support shaft 63 extending in the depth direction. there is. The distance between the counter plates 61 and 62 is slightly larger than the thickness of the girder plate 44, and the diameter of the support shaft 63 is slightly smaller than the concave groove 46. The lever 23 is connected to the case 12 by the support shaft 63 fitting into the concave groove 46 in a state where the opposing plates 61 and 62 sandwich the girder plate 44 therebetween. 63) is rotatably supported. In the lever 23, an end face 64 facing one side in the width direction is formed over approximately half of the other side in the longitudinal direction. The end face 64 is a plane along the longitudinal direction and the depth direction, and is engaged with the tip 56 of the engagement piece 53 in the shifter 22 . An end face 65 facing the other side in the width direction is formed on the other side in the longitudinal direction of the lever 23 . The end face 65 is a curved surface along the depth direction that becomes convex toward the other side in the width direction, and is engaged with the free end of the compensating bimetal 31 in the inversion mechanism 24 . As shown in FIG. 6 , a straight line L1 indicated by a dotted line connecting the center of the support shaft 63 and the position of the cross section 65 most expanded to the other side in the width direction, as seen in the depth direction, is the longitudinal direction. is extended along

"movement"

Next, main operations of one embodiment will be described.

7 is a diagram explaining the operation of a shifter and a lever.

Here, the case 12 is shown as seen from the rear side in the depth direction. Normally, the shifter 22 is located on one side in the width direction, and the lever 23 has an end face 65 pressed by the compensating bimetal 31, so that the other side in the longitudinal direction is positioned on one side in the width direction. is located in

Then, when the overload condition is established, the shifter 22 is displaced to the other side in the width direction by pressing at least one of the engagement piece 53 and the engagement piece 55 when the bimetal 21 is bent. As a result, when the shifter 22 is displaced to the other side in the width direction, the end face 64 of the lever 23 is pressed against the front end 56 of the engaging piece 55, counterclockwise when viewed from the rear side in the depth direction. By rotating in the direction, the other side in the longitudinal direction is displaced to the other side in the width direction. As a result, the inversion mechanism 24 is brought into a tripped state in which the contact a is closed and the contact b is opened when the free end side of the compensating bimetal 31 is displaced to the other side in the width direction.

And if the overload state is eliminated, the bimetal 21 will return to a straight shape, and the free end side will return to one side of the width direction. Further, when the reset bar 25 is in the manual reset position or the automatic reset position, the reversing mechanism 24 is restored to the normal state in which the contact a is open and the contact b is closed, and the compensating bimetal 31 , the free end side is displaced to one side in the width direction. As a result, when the end face 65 is pressed by the compensating bimetal 31, the lever 23 rotates clockwise when viewed from the rear side in the depth direction, and the other side in the longitudinal direction is displaced to one side in the width direction. As a result, the shifter 22 returns to one side in the depth direction when the engaging piece 55 is pressed against the end face 64 of the lever 23 .

"Action"

Next, the main action of one embodiment will be described.

A thermal overload relay (11) of a two-element structure that protects from overload includes a bimetal (21), a shifter (22), a lever (23), and a reversing mechanism (24). The bimetal 21 curves when heated. When the bimetal 21 is curved, the shifter 22 is pushed by the bimetal 21 and displaced. The lever 23 is rotatably supported by the support shaft 63, and when the shifter 22 is displaced, it is pressed by the shifter 22 and rotates. When the lever 23 rotates, the reversing mechanism 24 inverts the contact point by being pressed from a position outside the radial direction of the position pressed by the shifter 22 among the levers 23.

As a result, the lever 23 can amplify the amount of displacement of the shifter 22 and transmit it to the reversing mechanism 24 . That is, since the 2-element structure has fewer elements than the 3-element structure, the amount of displacement of the shifter 22 decreases accordingly, but the amount of displacement of the shifter 22 can be compensated by the amplifying action of the lever 23. Therefore, it is not necessary to review the design of the heater 26 in order to obtain a displacement equivalent to that of the three-element structure with the two-element structure. In addition, there is no need to separately design the heater 26 in the two-element structure and the three-element structure, so they can be common. Therefore, the increase in manufacturing cost can be suppressed, and also the management of each component in an assembling process becomes easy. Since the support shaft 63 is integrally molded in the lever 23, an increase in the number of parts is suppressed, and the ease of assembly work is also improved.

The lever 23 adjusts the position of the support shaft 63 as the center of rotation, the position pressed by the shifter 22, and the position to press the reversing mechanism 24, thereby increasing the amplification magnification of the amount of displacement in the shifter 22. this is adjusted For example, as seen in the depth direction, the closer the position of the support shaft 63 and the position pressed by the shifter 22 are, and the farther the position pressed by the shifter 22 and the position where the reversing mechanism 24 is pressed, the more amplified The magnification increases. In this way, the amplification factor can be arbitrarily adjusted and transmitted to the inversion mechanism 24. Depending on the amplification factor, the amount of displacement of the compensating bimetal 31 can be made larger than in the 3-element structure, so malfunction of the inverting mechanism 24 can be suppressed and reliability can be improved.

The lever 23 controls the position of the support shaft 63 and the reversing mechanism 24 as the center of rotation when the bimetal 21 is not curved, that is, in normal conditions, as viewed from the axial direction of the support shaft 63. The pressing positions are arranged in a direction orthogonal to the pressing direction of the reversing mechanism 24 . That is, as viewed in the depth direction, the angle θ formed by the straight line L1 connecting the center of the support shaft 63 and the position most expanded to the other side in the width direction among the cross sections 65 with respect to the longitudinal direction is made as small as possible. are doing When the lever 23 rotates, the trajectory at the position most extended to the other side in the width direction among the cross sections 65 is displaced in the width direction as the angle θ formed by the straight line L1 with respect to the longitudinal direction is smaller. because it does Therefore, the trajectory at the position where the inversion mechanism 24 is pressed becomes the most easily displaced in the width direction, and the amplification magnification of the amount of displacement in the shifter 22 can be increased.

In the shifter 22, the position to be pressed by the bimetal 21 and the position to press the lever 23 are arranged on a straight line along the displacement direction. In this way, since the force point and the action point are arranged on a straight line, when the shifter 22 is pressed by the bimetal 21, it is possible to prevent a clockwise moment from acting when viewed from the rear side in the depth direction. Therefore, it is not necessary to suppress the moment by weight balance, such as expanding the shape of the shifter 22 larger in one direction in the longitudinal direction than the position pressed by the bimetal 21 when viewed in the depth direction, and reducing weight and space savings can be realized.

The shifter 22 has a flat plate shape, and the support shaft 63 of the lever 23 extends in a direction perpendicular to the plane of the shifter 22 and rotates in the plane direction of the shifter 22 . Thereby, it can suppress that the thermal type overload relay 11 enlarges in the depth direction.

Next, a comparative example will be described.

8 is a diagram showing a comparative example.

Here, the case 12 is shown as seen from the rear side in the depth direction. The thermal overload relay 71 is equipped with a shifter 72 and has a different shape from the shifter 22 of one embodiment. In the thermal overload relay 71 used as a comparative example, when the shifter 72 pressed by the bimetal 21 directly presses the reversing mechanism 24, it becomes a trip state. Since the 2-element structure has fewer elements than the 3-element structure, the amount of displacement of the shifter 72 decreases accordingly. In order to obtain a displacement equivalent to that of the 3-element structure in the 2-element structure, it is necessary to review the design of the heater 26, but conversely, in the 3-element structure, the amount of heat generated increases, and the rising temperature of each terminal may exceed the standard range. That is, the heaters 26 had to be designed separately for the two-element structure and the three-element structure, and they could not be shared.

In addition, in the shifter 72, the position where the compensating bimetal 31 is pressed is on the other side in the longitudinal direction than the position where the bimetal 21 is pressed, and the power point and the action point are not arranged on a straight line along the width direction. Therefore, when the shifter 72 is pressed by the bimetal 21, a moment in the clockwise direction acts as a sliding resistance to the projection 45 when viewed from the rear side in the depth direction. Then, suppression of a moment was aimed at by weight balance by expanding the shape of the shifter 72 larger to one side of the longitudinal direction than the position pressed by the bimetal 21, seeing from the depth direction. Therefore, weight reduction and space saving have been hindered.

As mentioned above, although it demonstrated referring a limited number of embodiments, the scope of rights is not limited to these, Modification of embodiment based on the said indication is obvious for those skilled in the art.

11: thermal overload relay 12: case
21: bimetal 22: shifter
23: lever 24: inversion mechanism
25: reset bar 26: heater
27: connection terminal 31: compensation bimetal
32: release lever 33: tension spring
34: movable plate 35: plate spring
36: interlocking plate 41: bulkhead
42: bulkhead 43: bulkhead
44: girder plate 45: projection
46: concave groove 47: plate spring
51: long hole 52: long hole
53: hanging side 54: hanging side
55: hooked side 56: front end
61: counter plate 62: counter plate
63: support shaft 64: cross section
65: section 71: thermal overload relay
72 : Shifter

Claims (9)

In the thermal overload relay of the two-element structure that protects from overload,
A bimetal that curves when heated;
When the bimetal is curved, a shifter that is pressed and displaced by the bimetal;
A lever rotatably supported by a support shaft and rotated by being pressed by the shifter when the shifter is displaced; and
When the lever is rotated, a reversal mechanism for inverting the contact point by pressing from a position radially outside of the position pressed by the shifter among the levers
Thermal overload relay characterized in that it comprises a. The amplification magnification of the amount of displacement in the shifter is adjusted by adjusting the position of the support shaft serving as the center of rotation of the lever, the position pressed by the shifter, and the position to press the reversing mechanism. thermal overload relay. The reversing mechanism according to claim 1 or 2, wherein the lever, when the bimetal is not curved, the position of the supporting shaft serving as the center of rotation and the position of pressing the reversing mechanism when viewed from the axial direction of the supporting shaft Thermal overload relay, characterized in that listed in the direction orthogonal to the pressing direction. The thermal overload relay according to claim 1 or 2, wherein a position where the shifter is pressed by the bimetal and a position where the lever is pressed are arranged on a straight line along a displacement direction. The method of claim 1 or 2, wherein the shifter is flat,
The lever is a thermal overload relay, characterized in that the support shaft extends in a direction perpendicular to the plane of the shifter and rotates in the direction of the plane of the shifter. 4. The thermal overload relay according to claim 3, wherein in the shifter, a position where the bimetal is pressed and a position where the lever is pressed are arranged on a straight line along a displacement direction. The method of claim 3, wherein the shifter is flat,
The lever is a thermal overload relay, characterized in that the support shaft extends in a direction perpendicular to the plane of the shifter and rotates in the direction of the plane of the shifter. The method of claim 4, wherein the shifter is flat,
The lever is a thermal overload relay, characterized in that the support shaft extends in a direction perpendicular to the plane of the shifter and rotates in the direction of the plane of the shifter. The method of claim 6, wherein the shifter is flat,
The lever is a thermal overload relay, characterized in that the support shaft extends in a direction perpendicular to the plane of the shifter and rotates in the direction of the plane of the shifter.

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