Electromagnetic trip and circuit breaker having the same

Abstract

The utility model provides electromagnetic release and breaker including it. Electromagnetic release includes: static magnetic yoke, has mutually opposite upper wall and lower wall and connects in the side wall between upper wall and lower wall, upper wall, lower wall and side wall form open containing space together, sleeve, extends along up and down direction and installs in containing space, is provided with first chamber and second chamber in the sleeve along axial adjacent, the diameter of second chamber is greater than the diameter of first chamber, permanent magnet, fixedly set up in second chamber, moving core, passes through lower wall of static magnetic yoke, first and second chamber of sleeve, permanent magnet and upper wall of static magnetic yoke in proper order along up and down direction, thereby can move in up and down direction, the upper end of moving core extends to outside upper wall, and coil, winding is on the outer peripheral surface of sleeve, wherein, permanent magnet exerts magnetic attraction force to moving core to keep moving core in initial position, under the condition that the coil is electrified, moving core can move to the tripping position away from permanent magnet in initial position downwards.

Description

Technical Field

[0001] This utility model relates to an electromagnetic trip unit and a circuit breaker having the electromagnetic trip unit. Background Technology

[0002] Miniature circuit breakers (MCBs) are electrical protection devices that integrate overload, short-circuit, and leakage protection functions. When severe overload, short-circuit, or undervoltage faults occur, they can automatically disconnect the circuit to protect equipment and personal safety. Moreover, they generally do not require replacement of components after interrupting the fault current, thus gaining widespread application.

[0003] The electromagnetic trip unit is one of the components of a miniature circuit breaker, used to release the circuit breaker's holding mechanism, thereby causing the circuit breaker to automatically disconnect. Existing electromagnetic trip units for miniature circuit breakers consist of conductors, moving armatures, magnetic yokes, push rods, and return springs, and suffer from problems such as complex structure, occupying a large amount of internal space in the circuit breaker, and high cost. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides an electromagnetic trip unit with optimized structure and a circuit breaker having the electromagnetic trip unit.

[0005] This utility model provides an electromagnetic tripping device, comprising: a static magnetic yoke having an upper wall and a lower wall opposite to each other, and a side wall connecting the upper wall and the lower wall, the upper wall, the lower wall and the side wall together forming an open receiving space; a sleeve extending in the vertical direction and installed in the receiving space of the static magnetic yoke, the sleeve having an axially adjacent first chamber and a second chamber, the diameter of the second chamber being larger than the diameter of the first chamber; a permanent magnet fixedly disposed in the second chamber of the sleeve; a moving core sequentially passing through the lower wall of the static magnetic yoke, the first chamber and the second chamber of the sleeve, the permanent magnet and the upper wall of the static magnetic yoke in the vertical direction, thereby being movable in the vertical direction, the upper end of the moving core extending beyond the upper wall of the static magnetic yoke; and a coil wound around the outer circumferential surface of the sleeve, wherein the permanent magnet applies a magnetic attraction force to the moving core to hold the moving core in an initial position, and when the coil is energized, the moving core can move downward from the initial position to a tripping position away from the permanent magnet.

[0006] In one embodiment, the sleeve includes a first segment and a second segment extending along the axial direction, and a connecting portion connecting the first segment and the second segment. The second segment abuts against the upper wall of the static magnetic yoke. The first chamber is defined by the first segment, and the second chamber is defined by the second segment, the connecting portion, and the upper wall of the static magnetic yoke. The lower end of the sleeve includes a fixing portion protruding radially from the outer peripheral surface of the sleeve, the fixing portion abutting against the lower wall of the static magnetic yoke.

[0007] In one embodiment, the moving core includes a first portion that is at least partially inserted into a first chamber of the sleeve, and a second portion that extends upward from the first portion through a second chamber of the sleeve and extends beyond the upper wall of the static magnetic yoke. The diameter of the first portion is larger than the diameter of the second portion, and a stepped portion is formed at the interface between the first portion and the second portion.

[0008] In one embodiment, the electromagnetic trip device further includes a magnetic focusing sheet disposed between the connection portion of the permanent magnet and the sleeve, the moving core passing through the magnetic focusing sheet, at least a portion of the magnetic focusing sheet overlapping the stepped portion of the moving core in the vertical direction, and when the moving core is in the initial position, the moving core is attracted to the lower surface of the magnetic focusing sheet.

[0009] In one embodiment, the second segment of the sleeve has at least one first protrusion protruding toward the upper wall of the static magnetic yoke, and the upper wall of the static magnetic yoke has at least one corresponding first groove, such that the first protrusion of the second segment is inserted into the first groove of the upper wall of the static magnetic yoke; the fixing part of the sleeve has at least one second protrusion protruding toward the lower wall of the static magnetic yoke, and the lower wall of the static magnetic yoke has at least one corresponding second groove, such that the second protrusion of the fixing part is inserted into the second groove of the lower wall of the static magnetic yoke.

[0010] In one embodiment, the electromagnetic trip device further includes an elastic element connected to the lower end of the moving core to apply a downward pulling force to the moving core. When the coil is not energized, the magnetic attraction force applied by the permanent magnet to the moving core is greater than the downward pulling force applied by the elastic element to the moving core. When the coil is energized, the moving core moves downward from the initial position to the tripping position under the combined action of the electromagnetic force and the downward pulling force of the elastic element.

[0011] In one embodiment, the electromagnetic trip unit further includes a cap-shaped member that is sleeved and connected to the upper end of the moving core. When the moving core moves to the trip position, the cap-shaped member actuates the tripping mechanism of the circuit breaker.

[0012] This utility model provides a circuit breaker, including: a tripping mechanism; and an electromagnetic tripping device as described above.

[0013] In one embodiment, the circuit breaker further includes: an unlocking lever rotatable about a first axis between a first position and a second position; and a reset assembly disposed between the unlocking lever and the electromagnetic trip unit, wherein rotation of the unlocking lever from the first position to the second position is transmitted via the reset assembly to the moving core of the electromagnetic trip unit to restore the moving core to the initial position.

[0014] In one embodiment, the reset assembly includes: a hook-shaped member capable of rotating around a first axis along with the unlocking lever, and including a hook portion; and a reset member capable of rotating around a second axis parallel to the first axis, and including a first arm and a second arm that contact the upper end of the moving core of the electromagnetic trip unit, wherein when the unlocking lever rotates from the first position to the second position, the hook portion pushes the second arm to cause the reset member to rotate around the second axis, thereby the first arm pushes the moving core back to the initial position.

[0015] In one embodiment, the reset member is a V-shaped sheet metal part.

[0016] The advantages of this invention are that its electromagnetic trip unit achieves excellent tripping function through a simple and compact structure and with few components, while occupying a small space. Furthermore, the electromagnetic trip unit requires no riveting or welding for assembly and can be manufactured using a simplified process, eliminating the need for additional cleaning or polishing. In addition, the circuit breaker of this invention can achieve reset and reclosing operations through a simple reset component in conjunction with the electromagnetic trip unit. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an electromagnetic trip device according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of the electromagnetic trip unit according to an embodiment of the present invention;

[0019] Figure 3 This is an exploded view of the electromagnetic trip unit according to an embodiment of the present invention.

[0020] Figure 4A and 4B This is a schematic diagram showing the magnetic field distribution and force of the electromagnetic trip unit according to an embodiment of this utility model;

[0021] Figure 5 This is a perspective view of a circuit breaker according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram illustrating the tripping and resetting processes of the electromagnetic trip device according to an embodiment of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0024] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0025] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, the terms “a,” “the,” “described,” and similar terms do not necessarily indicate a quantity limitation. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “install,” “set,” “connect,” or “link,” and similar terms are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. “Above,” “below,” “left,” “right,” etc., are used only to indicate the relative positional relationship of the equipment during use or the positional relationship shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Figure 1 A schematic diagram of the electromagnetic trip device according to the present invention is shown. Figure 2 This is a cross-sectional view of the electromagnetic trip unit according to an embodiment of the present invention. Figure 3 This is an exploded view of the electromagnetic trip unit according to an embodiment of the present invention. A specific embodiment will be used for further explanation below.

[0027] refer to Figures 1 to 3The electromagnetic trip unit 1 of this utility model is used in a circuit breaker (not shown), especially in miniature circuit breakers (MCBs). It is a device that drives the tripping mechanism in the circuit breaker to achieve the tripping and disconnecting functions. The electromagnetic trip unit 1 mainly includes: a static magnetic yoke 10, a sleeve 20, a permanent magnet 30, a moving core 40, and a coil 50.

[0028] In this embodiment, the static magnetic yoke 10 may have an upper wall 11 and a lower wall 12 opposite to each other, and a side wall 13 connecting the upper wall 11 and the lower wall 12. The upper wall 11, the lower wall 12, and the side wall 13 together form an open receiving space 14. For example, the static magnetic yoke 10 is formed in a U-shape. The sleeve 20 may extend vertically and be installed in the receiving space 14 of the static magnetic yoke 10. The sleeve 20 has a first chamber 21 and a second chamber 22 that are axially adjacent, and the diameter of the second chamber 21 is larger than the diameter of the first chamber 22. The permanent magnet 30 may be fixedly disposed in the second chamber 22 of the sleeve 20, thereby being adjacent to the upper wall 11 of the static magnetic yoke 10. The moving core 40 may pass sequentially through the lower wall 11 of the static magnetic yoke 10, the first chamber 21 and the second chamber 22 of the sleeve 20, the permanent magnet 30, and the upper wall 11 of the static magnetic yoke in the vertical direction, thereby being movable in the vertical direction. The upper end of the moving core 40 extends beyond the upper wall 11 of the static magnetic yoke 10 to trigger the tripping mechanism of the circuit breaker. The coil 50 can be wound around the outer circumferential surface of the sleeve 20. The permanent magnet 30 can apply a magnetic attraction force to the moving core 40 to hold it in its initial position. When the coil 50 is energized, the moving core 40 can move downward from its initial position to a tripping position away from the permanent magnet 30. Therefore, the electromagnetic tripping device of this invention has a simple and compact structure, few components, and occupies little space. For example, the electromagnetic tripping device of this invention does not require riveting or welding for assembly; the sleeve can be a plastic component, and other components can be fixed by the plastic sleeve. The electromagnetic tripping device of this invention can be manufactured using a simplified manufacturing process without requiring additional cleaning, polishing, or other processes.

[0029] According to one embodiment of the present invention, the sleeve 20 may include a first segment 23 and a second segment 24 extending axially, and a connecting portion 25 connecting the first segment 23 and the second segment 24. The second segment 24 may abut against the upper wall 11 of the static magnetic yoke 10. The first chamber 21 may be defined by the first segment 23, and the second chamber 22 may be defined together by the second segment 24, the connecting portion 25, and the upper wall 11 of the static magnetic yoke 10. The lower end of the sleeve 20 may include a fixing portion 26 protruding radially from the outer peripheral surface of the sleeve 20, and the fixing portion 26 may abut against the lower wall 12 of the static magnetic yoke 10. In one embodiment, the side of the second segment 24 may have at least one first protrusion 241 protruding toward the upper wall 11 of the static magnetic yoke 10, and the side of the upper wall 11 of the static magnetic yoke 10 may correspondingly have at least one first groove 111, such that the first protrusion 241 of the side of the second segment 24 can be inserted into the first groove 111 of the upper wall 11 of the static magnetic yoke 10, thereby the second segment 24 can stably abut against the upper wall 11 of the static magnetic yoke 10. In one embodiment, the side of the fixing part 26 may have at least one second protrusion 261 protruding toward the lower wall 12 of the static magnetic yoke 10, and the side of the lower wall 12 of the static magnetic yoke 10 may correspondingly have at least one second groove 121, such that the second protrusion 261 of the side of the fixing part 26 can be inserted into the second groove 121 of the lower wall 12 of the static magnetic yoke 10, thereby the fixing part 26 can stably abut against the lower wall 12 of the static magnetic yoke 10.

[0030] According to one embodiment of the present invention, the moving core 40 may include a first portion 41 at least partially inserted into the first chamber 21 of the sleeve 20, and a second portion 42 extending upward from the first portion 41 to pass through the second chamber 22 of the sleeve 20 and extend beyond the upper wall 11 of the static magnetic yoke 10. The diameter of the first portion 41 may be larger than the diameter of the second portion 42. A stepped portion 43 may be formed at the interface between the first portion 41 and the second portion 42.

[0031] The electromagnetic trip unit 1 may further include a magnetic focusing sheet 60 disposed between the permanent magnet 30 and the connecting portion 25 of the sleeve 20, for concentrating the magnetic field and improving the magnetic field distribution. The moving core 40 can pass through the magnetic focusing sheet 60. That is, the permanent magnet 30 and the magnetic focusing sheet 60 can be stacked in the second chamber 22 of the sleeve and supported by the connecting portion 25 of the sleeve 20. Due to the restriction of the upper wall 11 of the static magnetic yoke 10 and the connecting portion 25 of the sleeve 20, the permanent magnet 30 and the magnetic focusing sheet 60 can be fixed in the vertical direction without moving. At least a portion of the magnetic focusing sheet 60 can overlap with the stepped portion 43 of the moving core 40 in the vertical direction. When the moving core 40 is in the initial position, the moving core 40 is attracted to the lower surface of the magnetic focusing sheet 60. Thus, when the coil is not energized, the permanent magnet 30 and the magnetic focusing sheet 60 can together attract and hold the moving core 40 in the initial position. Furthermore, since at least a portion of the magnetic sheet 60 overlaps with the stepped portion 43 of the moving core 40 in the vertical direction, the magnetic sheet 60 can also act as a limiting member for the moving core 40, restricting the upward movement of the first portion 41 of the moving core 40, thus preventing it from moving into the second chamber 22 of the sleeve 20. Therefore, the electromagnetic trip device of this invention achieves a good tripping function through a simple and compact structure and with few components.

[0032] According to one embodiment of the present invention, the electromagnetic trip unit 1 may further include a cap-shaped member 70, which is sleeved and connected to the upper end of the moving core 40. When the moving core 40 moves to the trip position, the cap-shaped member 70 can actuate the tripping mechanism of the circuit breaker, thereby realizing the disconnection of the circuit breaker. For example, the cap-shaped member 70 can be fixed to the top of the second part 42 of the moving core 40 by a snap-fit ​​connection.

[0033] According to one embodiment of the present invention, the electromagnetic trip unit 1 may further include an elastic element 80, which can be connected to the lower end of the moving core 40 to apply a downward pulling force to the moving core. For example, the elastic element 80 may be a spring.

[0034] Below, for reference Figure 4A and 4B The working principle of the electromagnetic trip device of this utility model will be described in detail. For example... Figure 4A As shown, when coil 50 is not energized, the static yoke 10, permanent magnet 30, magnetic focusing sheet 60, and moving core 40 can form a closed magnetic circuit. The permanent magnet 30 can apply an upward magnetic attraction force F to the moving core 40. mag Due to the upward magnetic attraction F mag The downward pulling force F exerted by the elastic element 80 on the moving core 40 is greater than that of the elastic element 80. spring Therefore, the moving core 40 can be attracted to the lower surface of the magnetic sheet 60, thus holding it in its initial position. For example, when the circuit breaker detects a short circuit, overload, or leakage that necessitates tripping, the capacitor in the circuit discharges, energizing the coil of the electromagnetic trip unit. Figure 4B As shown, when coil 50 is energized, a magnetic field opposite in direction to the magnetic field of permanent magnet 30 is generated in the closed magnetic circuit, thereby at least partially canceling the magnetic attraction force F generated by the permanent magnet. mag When the magnetic field generated by the energized coil is large enough, the moving core 40 will be affected by the electromagnetic force F. bobbin and the downward pulling force F of the elastic element 80 spring Under the combined action of the two, the magnetic attraction force F of the permanent magnet 30 is overcome. mag This causes the circuit breaker to move downwards from its initial position to a tripped position away from the permanent magnet 30, thereby disconnecting the circuit breaker.

[0035] Figure 5 This is a perspective view of a circuit breaker according to an embodiment of the present invention. The circuit breaker according to an embodiment of the present invention may include a tripping mechanism; and an electromagnetic trip unit 100 that actuates the tripping mechanism via a tripping operation, wherein the electromagnetic trip unit 100 may be a reference... Figures 1 to 3 The electromagnetic trip unit 1 in the various embodiments described.

[0036] Figure 6 This is a schematic diagram illustrating the tripping and resetting processes of the electromagnetic trip unit according to an embodiment of the present invention. A circuit breaker according to an embodiment of the present invention may further include an unlocking lever 200 rotatable about a first axis 210 between a first position and a second position; and a resetting assembly 300 disposed between the unlocking lever 200 and the electromagnetic trip unit 100, wherein the rotation of the unlocking lever 200 from the first position to the second position can be transmitted via the resetting assembly 300 to the moving core 140 of the electromagnetic trip unit 100 to restore the moving core 140 to its initial position. Figure 6 The four diagrams from left to right illustrate the process of the electromagnetic trip unit moving from its initial position to the tripped position and then back to its initial position. Figure 6 In the diagram, from left to right, the first figure shows the moving core 140 of the electromagnetic trip unit 100 in its initial position; the second figure shows the moving core 140 of the electromagnetic trip unit 100 in its tripped position; the third figure shows the state in which the circuit breaker is mechanically unlocked by rotating the unlocking lever 200 counterclockwise; and the fourth figure shows the electromagnetic trip unit 100 being reset to its initial position by continuing to rotate the unlocking lever 200 counterclockwise by the handle spring or by hand. In the first and second figures, the unlocking lever 200 is in the first position, and in the fourth figure, the unlocking lever 200 is in the second position.

[0037] According to one embodiment of the present invention, the reset assembly 300 may include: a hook-shaped member 310, which can rotate around a first axis 210 together with the unlocking lever 200, and includes a hook portion 311; and a reset assembly 320, which can rotate around a second axis 330 parallel to the first axis 210, and includes a first arm 321 and a second arm 322 that contact the upper end of the moving core 140 of the electromagnetic trip unit 100. When the unlocking lever 200 rotates counterclockwise from the first position to the second position, the hook portion 311 can push the second arm 322 to cause the reset assembly 320 to rotate clockwise around the second axis 330, thereby the first arm 321 pushes the moving core 140 to move horizontally to the left to return to the initial position. Thus, the circuit breaker reclosing operation is completed. For example, the reset assembly 320 may be a V-shaped sheet metal part. Thus, the circuit breaker of the present invention can realize reset and reclosing operations through a simple reset assembly in cooperation with the electromagnetic trip unit.

[0038] The electromagnetic trip unit of this invention achieves excellent tripping function through a simple and compact structure and few components, while occupying a small space. Furthermore, the electromagnetic trip unit of this invention requires no riveting or welding for assembly and can be manufactured using a simplified process, eliminating the need for additional cleaning or polishing. In addition, the circuit breaker of this invention can achieve reset and reclosing operations by cooperating with the electromagnetic trip unit through a simple reset component.

[0039] While the present invention has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art will understand that different changes in form and detail may be made without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. An electromagnetic trip unit, characterized in that, include: A static magnetic yoke has an upper wall and a lower wall opposite to each other, and a side wall connecting the upper wall and the lower wall, the upper wall, the lower wall and the side wall together forming an open receiving space; A sleeve extends vertically and is installed in the receiving space of the static magnetic yoke. The sleeve has a first chamber and a second chamber that are adjacent to each other along the axial direction. The diameter of the second chamber is larger than the diameter of the first chamber. The permanent magnet is fixedly disposed in the second chamber of the sleeve; The moving core passes sequentially through the lower wall of the static magnetic yoke, the first and second chambers of the sleeve, the permanent magnet, and the upper wall of the static magnetic yoke in the vertical direction, thereby being movable in the vertical direction. The upper end of the moving core extends beyond the upper wall of the static magnetic yoke. as well as The coil is wound around the outer circumferential surface of the sleeve. The permanent magnet applies a magnetic attraction force to the moving core to hold it in its initial position. When the coil is energized, the moving core can move downward from the initial position to a disengaged position away from the permanent magnet.

2. The electromagnetic trip unit according to claim 1, characterized in that, The sleeve includes a first section and a second section extending along the axial direction, and a connecting portion connecting the first section and the second section. The second section abuts against the upper wall of the static magnetic yoke. The first chamber is defined by the first segment, and the second chamber is defined by the second segment, the connecting portion, and the upper wall of the static magnetic yoke. The lower end of the sleeve includes a fixing part that protrudes radially from the outer peripheral surface of the sleeve, and the fixing part abuts against the lower wall of the static magnetic yoke.

3. The electromagnetic trip unit according to claim 2, characterized in that, The moving core includes a first portion that is at least partially inserted into a first chamber of the sleeve, and a second portion that extends upward from the first portion to pass through a second chamber of the sleeve and protrude beyond the upper wall of the static magnetic yoke. The diameter of the first part is larger than the diameter of the second part. A stepped portion is formed at the interface between the first portion and the second portion.

4. The electromagnetic trip unit according to claim 3, characterized in that, It also includes a magnetic focusing sheet disposed between the connection between the permanent magnet and the sleeve, through which the moving core passes. At least a portion of the magnetic focusing sheet overlaps with the stepped portion of the moving core in the vertical direction. When the moving core is in the initial position, the moving core is attracted to the lower surface of the magnetic sheet.

5. The electromagnetic trip unit according to claim 2, characterized in that, The second section of the sleeve has at least one first protrusion on its side that protrudes toward the upper wall of the static magnetic yoke, and the upper wall of the static magnetic yoke has at least one first groove on its side, such that the first protrusion on the side of the second section is inserted into the first groove of the upper wall of the static magnetic yoke. The fixing part of the sleeve has at least one second protrusion protruding toward the lower wall of the static magnetic yoke, and the lower wall of the static magnetic yoke has at least one second groove correspondingly formed on its side, such that the second protrusion of the fixing part is inserted into the second groove of the lower wall of the static magnetic yoke.

6. The electromagnetic trip unit according to claim 1, characterized in that, It also includes an elastic element connected to the lower end of the moving core to apply a downward pulling force to the moving core. When the coil is not energized, the magnetic attraction force exerted by the permanent magnet on the moving core is greater than the downward pulling force exerted by the elastic element on the moving core. When the coil is energized, the moving core moves downward from the initial position to the tripped position under the combined action of electromagnetic force and the downward pulling force of the elastic element.

7. The electromagnetic trip unit according to claim 1, characterized in that, It also includes a cap-shaped component that is fitted onto the upper end of the moving core. When the moving core moves to the trip position, the cap-shaped element actuates the tripping mechanism of the circuit breaker.

8. A circuit breaker, characterized in that, The circuit breaker includes: Tripping mechanism; and The electromagnetic trip unit as described in any one of claims 1-7.

9. The circuit breaker according to claim 8, characterized in that, The circuit breaker also includes: The unlocking lever is capable of rotating around a first axis between a first position and a second position. A reset assembly is disposed between the unlocking lever and the electromagnetic trip unit. The rotation of the unlocking lever from the first position to the second position is transmitted to the moving core of the electromagnetic trip unit via the reset assembly to restore the moving core to the initial position.

10. The circuit breaker according to claim 9, characterized in that, The reset component includes: A hook-shaped member, capable of rotating about the first axis along with the unlocking lever, and including a hook portion; and The reset member is rotatable about a second axis parallel to the first axis and includes a first arm and a second arm that contact the upper end of the moving core of the electromagnetic trip unit. When the unlocking lever rotates from the first position to the second position, the hook pushes the second arm to make the reset member rotate around the second axis, thereby the first arm pushes the moving core back to the initial position.

11. The circuit breaker according to claim 10, characterized in that, The reset component is a V-shaped sheet metal part.

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