Electromagnetic tripping devices, circuit breakers, and distribution boards

Abstract

To provide an electromagnetic trip device capable of assisting a circuit breaker to quickly open a contact portion when an abnormal current occurs.SOLUTION: An electromagnetic trip device 10 includes a bottom portion 12 and a side wall portion 13 standing on the bottom portion 12, and includes a fixed piece 11 that forms a groove through which an electric circuit 20 of a circuit breaker 60 passes and a movable piece 16 having a first portion 17 that faces the upper surface 13a of the side wall portion 13, and a second portion 18 facing the inner surface of the side wall portion 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic tripping device for use in a circuit breaker. [Background technology]

[0002] There is known a circuit breaker that detects an abnormal current such as a short-circuit current and cuts off a circuit connecting a load and a power source. Patent Document 1 discloses an electromagnetic tripping device for a circuit breaker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-215779 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides an electromagnetic tripping device that can assist a circuit breaker in quickly opening its contacts when an abnormal current occurs, and a circuit breaker equipped with the same. [Means for solving the problem]

[0005] An electromagnetic tripping device according to one embodiment of the present invention comprises a fixed piece having a bottom and a side wall portion erected from the bottom and forming a groove through which an electrical path of a circuit breaker passes, and a movable piece having a first portion facing the upper surface of the side wall portion and a second portion facing the inner surface of the side wall portion.

[0006] A circuit breaker according to one aspect of the present invention includes the electromagnetic tripping device and the electric circuit.

[0007] A distribution board according to one aspect of the present invention includes the circuit breaker and a housing that houses the circuit breaker. [Effects of the Invention]

[0008] According to an electromagnetic tripping device according to one aspect of the present invention, a circuit breaker or the like can be realized that can quickly open the contact portion when an abnormal current occurs. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of the appearance of an electromagnetic tripping device according to an embodiment in a normal state. [Figure 2] FIG. 2 is an external perspective view of the electromagnetic tripping device according to the embodiment in a state where an abnormality has been detected. [Figure 3] FIG. 3 is an external view of the electromagnetic tripping device according to the embodiment as viewed from the X-axis direction. [Figure 4] FIG. 4 is an external view of the electromagnetic tripping device according to the embodiment as viewed from the Y-axis direction. [Figure 5] FIG. 5 is an external view of the electromagnetic tripping device according to the embodiment as viewed from the Z-axis direction. [Figure 6] FIG. 6 is a cross-sectional view of the electromagnetic tripping device according to the embodiment taken along the XY plane. [Figure 7] FIG. 7 is an external perspective view of the electromagnetic tripping device according to the embodiment in a state where the movable piece is held by the holding member. [Figure 8] FIG. 8 is an external perspective view of an electromagnetic tripping device according to a comparative example. [Figure 9] FIG. 9 is a diagram showing current values ​​when the electromagnetic tripping device according to the embodiment and the electromagnetic tripping device according to the comparative example transition from the normal state to the abnormality detection state. [Figure 10] FIG. 10 is a cross-sectional view of an electromagnetic tripping device according to a modified example taken along the XY plane. [Figure 11] FIG. 11 is a diagram showing the internal structure of the circuit breaker according to the embodiment in a closed state. [Figure 12] FIG. 12 is a diagram showing the internal structure of the circuit breaker according to the embodiment in a state immediately after the contacts are opened. [Figure 13]FIG. 13 is an external perspective view of the distribution board according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0011] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0012] Coordinate axes may be shown in the drawings used in the following embodiments. The positive side of the Z-axis direction may be expressed as the upper side (upper), and the negative side of the Z-axis direction may be expressed as the lower side (lower). The X-axis direction and the Y-axis direction are perpendicular to each other on a plane perpendicular to the Z-axis direction.

[0013] (Embodiment) [Configuration of electromagnetic tripping device] The circuit breaker according to the embodiment will be described below. Fig. 1 is an external perspective view of the electromagnetic tripping device according to the embodiment in a normal state. Fig. 2 is an external perspective view of the electromagnetic tripping device according to the embodiment in a state in which an abnormal current is detected (hereinafter also simply referred to as an abnormality detection state).

[0014] The electromagnetic tripping device 10 is a device for quickly opening the contacts (described later) of a circuit breaker when an abnormal current such as a short-circuit current is detected. As shown in Figures 1 and 2, the electromagnetic tripping device 10 includes a fixed piece 11 and a movable piece 16. When an abnormal current flows in an electric circuit 20, for example, the movable piece 16 moves relative to the fixed piece 11, causing the electromagnetic tripping device 10 to change from a normal state (Figure 1) to an abnormality detection state (Figure 2), and as a result, the contacts are opened.

[0015] Note that the positional relationship between fixed piece 11 and movable piece 16 in the normal state shown in Figure 1 is an example, and it is not essential that, in the normal state, movable piece 16 assumes the exact position relative to the fixed piece as shown in Figure 1. Similarly, the positional relationship between fixed piece 11 and movable piece 16 in the abnormality detection state shown in Figure 2 is an example, and it is not essential that, in the abnormality detection state, movable piece 16 assumes the exact position relative to fixed piece 11 as shown in Figure 2.

[0016] The structures of the fixed piece 11 and the movable piece 16 will be described below with reference to Figs. 3 to 6 in addition to Figs. 1 and 2. Fig. 3 is an external view of the electromagnetic tripping device 10 as viewed from the X-axis direction. Fig. 4 is an external view of the electromagnetic tripping device 10 as viewed from the Y-axis direction. Fig. 5 is an external view of the electromagnetic tripping device 10 as viewed from the Z-axis direction. Fig. 6 is a cross-sectional view of the electromagnetic tripping device 10 cut along the XY plane. Figs. 3 to 6 all show the electromagnetic tripping device 10 in an abnormality detection state. The X-axis direction can be rephrased as the width direction of the groove formed by the fixed piece 11, the Y-axis direction as the height direction of the groove, and the Z-axis direction as the extension direction of the groove.

[0017] The fixed piece 11 is a member with a U-shaped cross section that forms a groove through which the electric circuit 20 of the circuit breaker passes. The U-shape can also be referred to as a U-shape or a bracket shape. The fixed piece 11 functions as a yoke when an abnormal current flows in the electric circuit 20. Specifically, the fixed piece 11 has a bottom portion 12 and a side wall portion 13 that stands on the bottom portion 12.

[0018] The bottom portion 12 is a portion of the fixing piece 11 that corresponds to the bottom of the groove. The bottom portion 12 is a plate-like portion that is substantially rectangular in plan view.

[0019] The side wall portions 13 are flat plate-shaped portions that stand on both ends of the bottom portion 12 in the X-axis direction. The side wall portion 13 includes a first side wall portion 14 and a second side wall portion 15 that is higher from the bottom portion 12 than the first side wall portion 14. The first side wall portion 14 is located on the positive side in the Z-axis direction of the second side wall portion 15, and the second side wall portion 15 is located on the negative side in the Z-axis direction of the first side wall portion 14. It is not essential that the side wall portion 13 include the first side wall portion 14 and the second side wall portion 15, and the height of the side wall portion 13 from the bottom portion 12 may be constant.

[0020] The fixed piece 11 described above is formed, for example, by bending a metal plate, but may also be formed by welding the side wall portion 13 to the bottom portion 12. The main material constituting the fixed piece 11 is, for example, iron. In other words, the fixed piece 11 can be referred to as a fixed iron piece. The main material constituting the fixed piece 11 may also be a magnetic material (metal material) other than iron.

[0021] The movable piece 16 is positioned away from the fixed piece 11 so as to block the groove formed by the fixed piece 11, and is a member that moves relative to the fixed piece 11. Note that in an abnormality detection state, the movable piece 16 may come into contact with the fixed piece 11. The movable piece 16 has a first portion 17 facing the upper surface 13a of the side wall portion 13, a second portion 18 facing the inner surface 13b of the side wall portion 13, and a connection portion 19.

[0022] The first portion 17 is a flat portion having a rectangular shape in a plan view. Both end portions of the first portion 17 in the X-axis direction face the upper surfaces 13a of the corresponding side wall portions 13. More specifically, both end portions of the first portion 17 in the X-axis direction face the upper surfaces 13a of the corresponding first side wall portions 14.

[0023] The second portion 18 has a U-shaped cross section. Both end portions of the second portion 18 in the X-axis direction are bent toward the fixing piece 11 and fit into the groove formed by the fixing piece 11. Each end portion of the second portion 18 faces the inner surface 13b of the corresponding side wall portion 13. More specifically, each end portion of the second portion 18 faces the inner surface 13b of the corresponding second side wall portion 15.

[0024] The connecting portion 19 is a portion that connects the first portion 17 and the second portion 18. The connecting portion 19 is a flat portion that is rectangular in plan view. The length (width) of the connecting portion 19 in the X-axis direction is shorter than both the first portion 17 and the second portion 18. The length (width) in the X-axis direction of the first portion 17 is the longest, followed by the second portion 18, and the connecting portion 19 is the shortest.

[0025] The movable piece 16 described above is formed, for example, by bending a metal plate, but may also be formed by welding at least one of the three portions to another portion. The main material constituting the movable piece 16 is, for example, iron. In other words, the movable piece 16 can be referred to as a movable iron piece. The main material constituting the movable piece 16 may be a magnetic material (metal material) other than iron.

[0026] The movable piece 16 is held by, for example, a holding member, and the holding member holds the movable piece 16 by utilizing the connection portion 19. Figure 7 is an external perspective view of the electromagnetic tripping device 10 in a state where the movable piece 16 is held by the holding member.

[0027] The holding member 30 has an axis 31 along the X-axis direction. The movable piece 16 rotates around the axis 31. In the electromagnetic tripping device 10, in the normal state, the movable piece 16 is biased in a direction away from the fixed piece 11 by a spring connected to the spring connection portion 32 of the holding member 30. In other words, in the normal state, the biasing force on the movable piece 16 increases the gap between the movable piece 16 and the fixed piece 11.

[0028] When an abnormal current flows through the electric circuit 20, a magnetic field is formed around the electric circuit 20 due to the abnormal current, and a magnetic force (attraction force) is generated in the gap between the fixed piece 11 and the movable piece 16. This magnetic force causes the movable piece 16 to rotate around the axis 31 and be attracted toward the fixed piece 11. This causes the electromagnetic tripping device 10 to transition from the normal state to the abnormality detection state. Note that in FIG. 7, the first portion 17 of the movable piece 16 is located closer to the axis 31 than the second portion 18 in the Y-axis direction, but conversely, the second portion 18 of the movable piece 16 may be located closer to the axis 31 than the first portion 17.

[0029] [Effects obtained by the electromagnetic tripping device] In the electromagnetic tripping device 10, the second portion 18 is provided on the movable portion 16, thereby increasing the influence of the magnetic force generated in the gap between the fixed portion 11 and the movable portion 16 on the movable portion 16. The electromagnetic tripping device 10 can transition to the abnormality detection state with a lower current than an electromagnetic tripping device not provided with the second portion 18 (hereinafter also referred to as an electromagnetic tripping device according to a comparative example). Fig. 8 is an external perspective view of the electromagnetic tripping device according to the comparative example. Fig. 9 is a diagram showing current values ​​when the electromagnetic tripping device 10 and an electromagnetic tripping device 40 according to the comparative example transition from the normal state to the abnormality detection state.

[0030] 9 shows simulation results of the current values ​​when the electromagnetic tripping device 10 and the electromagnetic tripping device according to the comparative example transition from the normal state to the abnormality detection state for two cases, one where the elastic force of the spring connected to the holding member 30 is weak and the other where it is strong. In FIG. 9, the current values ​​are displayed as a multiplied value with the rated current In as the reference.

[0031] 9, the electromagnetic tripping device 10 can operate with a lower current than the electromagnetic tripping device 40 according to the comparative example. In other words, the electromagnetic tripping device 10 can quickly transition to an abnormality detection state when an abnormal current occurs, and can be said to be an electromagnetic tripping device with improved operating performance.

[0032] Furthermore, in order to obtain operating performance equivalent to that of the electromagnetic tripping device 10 using the electromagnetic tripping device 40 according to the comparative example, it is necessary to reduce the gap (distance) between the fixed piece 41 and the movable piece 46. However, reducing the gap between the fixed piece 41 and the movable piece 46 poses the problem of making it difficult to ensure the stroke (range of movement) of the movable piece 16. In contrast, the electromagnetic tripping device 10 can achieve both operating performance and ensuring the stroke by having the second portion 18 fit into the groove formed by the fixed piece 11.

[0033] In addition, since the side wall portion 13 of the fixed piece 11 has a step (a configuration having the first side wall portion 14 and the second side wall portion 15), both ends of the second portion 18 of the movable piece 16 (the portion facing the second side wall portion 15) can be made to face the side wall portion 13 without making the size of these ends of the second portion 18 face each other. Here, the area of ​​the portion of the first portion 17 of the movable piece 16 facing the upper surface 13a of the first side wall portion 14 is directly related to the operating performance, but if the size of both ends of the second portion 18 is small, the stroke of the movable piece 16 and the space for inserting the electric circuit 20 can be secured while securing this area.

[0034] [Modification of electromagnetic tripping device] In the electromagnetic tripping device 10, the upper surface 13a of the first side wall portion 14 is a plane along the XZ plane (in other words, a plane perpendicular to the Y-axis direction), but may be an inclined surface. Fig. 10 is a cross-sectional view of an electromagnetic tripping device according to such a modified example cut along the XY plane.

[0035] The electromagnetic tripping device 50 according to the modified example includes a fixed piece 51 and a movable piece 56. Specifically, the fixed piece 51 has a bottom 52 and a side wall 53 standing on the bottom 52. The side wall 53 includes a first side wall 54 and a second side wall (not shown) that is higher from the bottom 52 than the first side wall 54. The movable piece 56 has a first portion 57 facing an upper surface 53a of the side wall 53, a second portion (not shown) facing an inner surface 53b of the side wall 53, and a connection portion (not shown).

[0036] The electromagnetic tripping device 50 basically has the same structure as the electromagnetic tripping device 10, but differs in that the upper surface 53a of the side wall portion 53 (first side wall portion 54) is an inclined surface. This inclined surface is an inclined surface whose height from the bottom 52 decreases the closer it is to the groove formed by the fixing piece 51.

[0037] In this way, if the upper surface 53a of the side wall portion 53 (first side wall portion 54) is an inclined surface, it is possible to increase the area of ​​the upper surface 53a (i.e., the area of ​​the portion of the fixed piece 51 that faces the first portion 57 of the movable piece 56). In other words, the upper surface 53a can improve the operating performance of the electromagnetic tripping device 50. Although not shown, the upper surface 53a of the second side wall portion is flat, it may also be an inclined surface like the upper surface 53a of the first side wall portion 54.

[0038] In the electromagnetic tripping device 50, the side surfaces 57a located at both ends in the X-axis direction of the first portion 57 of the movable piece 56 have an inclination corresponding to the upper surface 53a (inclined surface) of the first side wall portion 54. Specifically, the side surfaces 57a are inclined so as to be substantially parallel to the upper surface 53a in the abnormality detection state.

[0039] In this way, if the side surface 57a has an inclination corresponding to the upper surface 53a of the first side wall portion 54, it is possible to increase the area of ​​the side surface 57a (i.e., the area of ​​the portion of the movable piece 56 that faces the fixed piece 51). In other words, the side surface 57a can improve the operating performance of the electromagnetic tripping device 50.

[0040] In the electromagnetic tripping device 50, it is not essential that both the top surface 53a and the side surface 57a are inclined surfaces, but it is sufficient that at least one of the top surface 53a and the side surface 57a is an inclined surface.

[0041] [Circuit breaker configuration] The present invention may be realized as a circuit breaker including an electromagnetic tripping device 10 (or an electromagnetic tripping device 50). Fig. 11 is a diagram showing the internal structure of a circuit breaker according to an embodiment. Fig. 11 shows the internal structure in a closed state (more specifically, a state in which the electromagnetic tripping device 10 is in a normal state and the lever 68 is on), and members that form the conductive path inside the circuit breaker 60 are hatched.

[0042] A circuit breaker 60 is used in a distribution board or the like, and is a device that turns on and off an electrical connection between a load and a power source. An end of an electric wire connected to a load is inserted into a socket 61 of the circuit breaker 60, and the end is electrically connected to a load-side terminal structure 64 provided in the socket 61. An end of an electric wire connected to a power source is inserted into a socket 62 located on the opposite side of the socket 61, and the end is electrically connected to a power-source-side terminal structure 67 provided in the socket 62.

[0043] The circuit breaker 60 mainly comprises a housing 63 , a load side terminal structure 64 , an opening / closing mechanism 65 , a contact portion 66 , a power supply side terminal structure 67 , a lever 68 , an electromagnetic tripping device 10 , and an electrical circuit 20 .

[0044] The housing 63 accommodates the load side terminal structure 64, the switching mechanism 65, the contact portion 66, the power supply side terminal structure 67, the electromagnetic tripping device 10, and the electrical circuit 20. The housing 63 is formed, for example, from an insulating resin material.

[0045] The load side terminal structure 64 is a terminal to which an end of an electric wire is pressed and fixed by turning a screw. The load side terminal structure 64 is electrically connected to the electric circuit 20. The electric circuit 20 is a long plate-shaped member made of a metal material.

[0046] The electromagnetic tripping device 10 has the configuration described in the above embodiment. The shape and the like of the electromagnetic tripping device 10 are modified to fit the circuit breaker 60. For example, the movable leaf 16 has a shape that allows it to be connected to the opening and closing mechanism 65. However, the technical features, such as the movable leaf 16 having the first portion 17 and the second portion 18, are as described in the above embodiment. A detailed description of the electromagnetic tripping device 10 will be omitted here.

[0047] The switching mechanism 65 is a mechanism that quickly opens the contact portion 66 when it detects an abnormal current such as a short-circuit current. Specifically, the switching mechanism 65 is structurally connected to the movable piece 16 of the electromagnetic tripping device 10, and in a normal state, the elastic force of the spring maintains the electromagnetic tripping device 10 in a normal state. When an abnormal current flows in the electric circuit 20 and the movable piece 16 moves toward the fixed piece, the switching mechanism 65 opens the contact portion 66, and at the same time, the lever 68 falls to the OFF side. Figure 12 is a diagram showing the internal structure of the circuit breaker 60 in a state immediately after the contacts are opened (more specifically, in a state in which the electromagnetic tripping device 10 is in an abnormality detection state and the lever 68 is OFF).

[0048] The contact portion 66 has a first contact 66a on the load side terminal structure 64 and electric circuit 20 side, and a second contact 66b on the power supply side terminal structure 67 side.

[0049] The power supply side terminal structure 67 is a terminal to which an end of an electric wire is pressed and fixed by a leaf spring. The power supply side terminal structure 67 is electrically connected to the second contact 66b.

[0050] Such a circuit breaker 60 is equipped with the electromagnetic tripping device 10, and therefore can quickly open the contacts 66 when an abnormal current occurs.

[0051] [Distribution board configuration] The present invention may be realized as a distribution board including the circuit breaker 60. Fig. 13 is an external perspective view of the distribution board according to the embodiment.

[0052] As shown in Fig. 13, the distribution board 100 includes a housing 101 and at least one circuit breaker 60 inside the housing 101. The distribution board 100 may include a plurality of circuit breakers 60. The circuit breaker 60 may be used as a branch breaker that turns on and off the electrical connection between the load and the power source in the branch circuit, or as a main breaker that turns on and off the electrical connection between the load and the power source in the main circuit. The circuit breaker 60 includes an electromagnetic tripping device 10 or an electromagnetic tripping device 50.

[0053] Such a distribution board 100 can quickly open the contacts when an abnormal current occurs.

[0054] [Effects, etc.] As described above, the electromagnetic tripping device 10 has a bottom 12 and a side wall 13 standing on the bottom 12, and is equipped with a fixed piece 11 that forms a groove through which the electrical path 20 of the circuit breaker 60 passes, and a movable piece 16 that has a first portion 17 facing the upper surface 13a of the side wall 13 and a second portion 18 facing the inner surface 13b of the side wall 13.

[0055] Such an electromagnetic tripping device 10 can assist the circuit breaker 60 in quickly opening the contact portion 66 when an abnormal current occurs.

[0056] Furthermore, for example, the movable piece 16 rotates around an axis 31 along the width direction of the groove, and the first portion 17 is located closer to the axis 31 than the second portion 18 in the extension direction of the groove.

[0057] This type of electromagnetic tripping device 10 is configured such that the first portion 17 is located closer to the axis 31 than the second portion 18, thereby assisting the circuit breaker 60 in quickly opening the contact portion 66 when an abnormal current occurs.

[0058] Moreover, for example, the side wall portion 13 includes a first side wall portion 14 and a second side wall portion 15 that is higher from the bottom portion 12 than the first side wall portion 14. The first portion 17 faces the upper surface 13a of the first side wall portion 14, and the second portion 18 faces the inner surface 13b of the second side wall portion 15.

[0059] According to this configuration, both ends of the second portion 18 of the movable piece 16 can be opposed to the side wall portion 13 without increasing the size of the both ends (the portions facing the second side wall portion 15) of the second portion 18 significantly. If the size of the both ends of the second portion 18 is small, the area of ​​the portion of the first portion 17 of the movable piece 16 facing the upper surface 13a of the first side wall portion 14 can be ensured, while the stroke of the movable piece 16 and the space for inserting the electric circuit 20 can be ensured.

[0060] Furthermore, for example, the upper surface 53a of the side wall portion 53 is an inclined surface whose height from the bottom portion 52 decreases as the portion approaches the groove.

[0061] With this configuration, the area of ​​the upper surface 53a of the side wall portion 53 can be increased compared to when the upper surface 53a is not inclined. If the area of ​​the upper surface 53a is increased, the operating performance of the electromagnetic tripping device 50 can be improved.

[0062] Furthermore, for example, the side surface 57a located at the end of the groove in the width direction of the first portion 57 has an inclination corresponding to the inclined surface.

[0063] With this configuration, the area of ​​the side surface 57a can be increased compared to when the side surface 57a is not inclined. If the area of ​​the side surface 57a is increased, the operating performance of the electromagnetic tripping device 50 can be improved.

[0064] Furthermore, for example, at least one of the fixed piece 11 and the movable piece 16 is formed by processing a metal plate.

[0065] As a result, at least one of the fixed piece 11 and the movable piece 16 can be manufactured only by bending, without welding or cutting.

[0066] The circuit breaker 60 also includes an electromagnetic tripping device 10 and an electrical circuit 20 .

[0067] Such a circuit breaker 60 can quickly open the contact portion 66 when an abnormal current occurs.

[0068] The distribution board 100 also includes a circuit breaker 60 and a housing 101 that houses the circuit breaker 60.

[0069] Such a distribution board 100 can quickly open the contact portion 66 when an abnormal current occurs.

[0070] (Other embodiments) Although the embodiments have been described above, the present invention is not limited to the above-described embodiments.

[0071] Furthermore, the general or specific aspects of the present invention may be realized as any of a system, an apparatus, and a method. For example, the present invention may be realized as an electromagnetic tripping device, a circuit breaker, or a method for manufacturing a distribution board.

[0072] In addition, the present invention also includes forms obtained by making various modifications to each embodiment and variant that a person skilled in the art would think of, and forms realized by arbitrarily combining the components and functions in the embodiments within the scope that does not deviate from the spirit of the present invention. [Explanation of symbols]

[0073] 10, 50 Electromagnetic tripping device 11, 51 Fixed piece 12, 52 bottom 13, 53 Side wall 13a, 53a top surface 13b, 53b inner surface 14, 54 First side wall part 15 Second side wall part 16, 56 Movable piece 17, 57 First part 18 Second Part 20 Circuits 31 axis 57a Side View 60 circuit breaker 100-point control panel 101 box

Claims

1. a fixing piece having a bottom and a side wall portion erected on the bottom, the fixing piece forming a groove through which an electric path of the circuit breaker passes; a movable piece having a first portion facing an upper surface of the side wall portion and a second portion facing an inner surface of the side wall portion, The upper surface of the side wall portion is an inclined surface in which the height from the bottom decreases as the portion approaches the groove. Electromagnetic tripping device.

2. The movable piece rotates around an axis along the width direction of the groove, In the extension direction of the groove, the first portion is located closer to the axis than the second portion.

2. The electromagnetic tripping device according to claim 1.

3. the side wall portion includes a first side wall portion and a second side wall portion that is higher in height from the bottom portion than the first side wall portion, the first portion faces an upper surface of the first side wall portion, The second portion faces the inner surface of the second side wall portion.

3. An electromagnetic tripping device according to claim 1 or 2.

4. The side surface of the first portion located at the end of the groove in the width direction has an inclination corresponding to the inclined surface. The electromagnetic tripping device according to any one of claims 1 to 3.

5. At least one of the fixed piece and the movable piece is formed by processing a metal plate. The electromagnetic tripping device according to any one of claims 1 to 4.

6. An electromagnetic tripping device according to any one of claims 1 to 5; The electrical circuit Circuit breaker.

7. The circuit breaker according to claim 6; a housing for accommodating the circuit breaker; Distribution board.

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