Molded case circuit breaker

Abstract

A kind of moulded case circuit breaker belongs to low-voltage electrical apparatus technical field.It includes shell;Contact system and magnetic releaseer being arranged in the cavity formed by the inside of shell;The contact system includes movable contact, and the soft connection of movable contact is connected with the excitation conductor of magnetic releaseer, and the magnetic releaseer includes yoke and armature, characterized by: the connection position of soft connection and excitation conductor is located between the yoke and armature of magnetic releaseer.The advantages are: because the connection of soft connection and excitation conductor is located between the yoke and armature of magnetic releaseer, the length of conductor between contact system and outlet terminal is greatly shortened, which not only saves valuable copper resources and reduces cost, but also makes structure more compact, saves space and meets the requirements of miniaturization development of circuit breaker;Because the excitation conductor is significantly shortened, it can avoid the adverse factors such as energy loss and temperature rise.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to a molded case circuit breaker. Background Technology

[0002] Figure 1 This is a schematic diagram of the conductive circuit of a molded case circuit breaker in the prior art. Figure 2 This is a three-dimensional structural diagram of the yoke 41 and thermal trip unit 8 of the magnetic trip unit in a conventional molded case circuit breaker. The conductive circuit includes a contact system 2, which includes a movable contact 21 and a fixed contact 22. The movable contact 21 is rotatably driven relative to the fixed contact 22, which is electrically connected to the incoming terminal 5, with a fixed pivot point as its rotation center. According to common knowledge, since molded case circuit breakers are usually configured as 2-pole, 3-pole, or 4-pole circuit breakers, the number of contact systems 2 is adapted accordingly.

[0003] exist Figure 1 and Figure 2 One end of the conductor shown in the diagram is connected to... Figure 1 The flexible connection 213 of the movable contact 21 shown is electrically connected, while the other end of the conductor is electrically connected to the output terminal 6. A bimetallic strip of thermal trip unit 8 and a magnetic trip unit 4 are installed on the conductor. The part of the conductor that is tightly fixed to the bimetallic strip is the thermal element of the thermal trip unit and is the excitation conductor of the thermal trip unit. The part of the conductor that passes between the yoke and the armature is the excitation conductor of the magnetic trip unit and is the excitation conductor of the magnetic trip unit.

[0004] The conductor connected to the bimetallic strip transfers heat to the bimetallic strip. When an overload current occurs in the conductive circuit, the bimetallic strip slowly bends (also known as "deforms"), and after a reasonable time, it strikes the operating mechanism, tripping the circuit breaker and forming overload protection.

[0005] The magnetic trip unit 4 includes a U-shaped yoke 41 and an armature 42. A conductor passing through the cavity (yoke cavity) of the U-shaped yoke 41 provides an excitation magnetomotive force to the magnetic trip unit 4. When a short circuit occurs in the conductive circuit, under the action of the excitation magnetomotive force, the armature 42 rotates rapidly, the magnetic trip unit 4 actuates, and the operating mechanism trips, separating the movable contact 21 and the fixed contact 22, thus forming short circuit protection.

[0006] Depend on Figure 1As shown, one end of the conductor is electrically connected to the flexible connector 213 by welding, and the other end is electrically connected to the outgoing terminal 6. Therefore, since the fixed end 2131 of the flexible connector 213 welded to the conductor is not inside the cavity (yoke cavity) of the aforementioned U-shaped yoke 41, the flexible connector 213 is first connected to the conductor outside the aforementioned cavity of the U-shaped yoke 41 (i.e., outside the yoke cavity). The conductor then extends into the U-shaped yoke 41, and the conductor extending into the cavity serves as the excitation conductor of the electromagnetic trip unit 4. This increases the amount of copper used in the circuit breaker, significantly raising the cost, and also makes the circuit breaker structure less compact, hindering the miniaturization of the circuit breaker. Utility Model Content

[0007] The objective of this invention is to provide a molded case circuit breaker that helps to reflect the rationality of the electrical connection position of the excitation conductor, thereby saving copper resources (a non-ferrous metal) and reducing costs, and that facilitates a compact structure to save space and meet the requirements of miniaturization.

[0008] The present invention achieves its objective as follows: a molded case circuit breaker includes a housing; a contact system and a magnetic trip unit disposed within a cavity formed inside the housing; the contact system includes a moving contact, the moving contact being connected by a flexible connection to the excitation conductor of the magnetic trip unit; the magnetic trip unit includes a yoke and an armature; characterized in that the connection position between the flexible connection and the excitation conductor is located between the yoke and the armature of the magnetic trip unit.

[0009] In a specific embodiment of this utility model, the yoke includes side plates and a bottom plate. The side plates are a pair that fold upwards from the front and rear sides of the bottom plate to form a face-to-face position. The pair of side plates and the bottom plate together form a U-shaped yoke with a yoke cavity. The armature includes a striking rod and a snap plate. The lower end of the striking rod forms a snap plate connecting seat, which is fixed to the upward-facing side of the snap plate. A pivot head is formed on the front and rear sides of the right end of the snap plate connecting seat. The pivot head is rotatably supported on the upper right end of the pair of side plates. The upper end of the striking rod extends upwards. The snap plate corresponds to the upper cavity opening of the yoke cavity. The excitation conductor passes through the yoke cavity and is fixed to the bottom plate inside the yoke cavity.

[0010] In another specific embodiment of the present invention, a pivot head support groove is formed on the upper right end of the pair of side plates and at a position corresponding to each other in front and behind, and the pivot head is rotatably supported in the pivot head support groove.

[0011] In another specific embodiment of this utility model, the flexible connection is welded to the surface of the excitation conductor facing the mating plate via its fixed end.

[0012] In another specific embodiment of this utility model, the excitation conductor is bent at a position corresponding to the fixed end to form a connecting portion, and the fixed end of the flexible connection is fastened to the connecting portion.

[0013] In another specific embodiment of this utility model, a thermal trip device is also provided in the cavity. The thermal trip device includes a conductor connection part and a thermal actuation part. The conductor connection part is attached to and fastened to the side surface of the excitation conductor facing the snap plate in the yoke cavity. The fixed end of the flexible connection and the conductor connection part are arranged in the yoke cavity in a manner that is arranged sequentially along the extension direction of the excitation conductor or partially or completely overlapped.

[0014] In a further specific embodiment of this utility model, an arc-extinguishing device is also provided in the cavity. The arc-extinguishing device corresponds to the end of the cavity near the input terminal in the length direction of the molded case circuit breaker defined by the arrangement direction of both the input and output terminals of the contact system. In the height direction of the molded case circuit breaker defined by the direction of action of the moving contact, the excitation conductor extends along the length direction of the molded case circuit breaker at a height position lower than the output terminal.

[0015] In a further specific embodiment of this utility model, an operating mechanism is also provided in the cavity. The moving contact has a rotating shaft located below the operating mechanism. The operating mechanism drives the rotating shaft, which in turn drives the moving contact guide rod of the moving contact connected thereto to separate or close from the fixed contact of the contact system. The striking rod of the armature cooperates with the operating mechanism.

[0016] In yet another specific embodiment of this utility model, a reaction spring hanging edge extends upward from the front and rear sides of the flapping plate connecting seat. In use, one end of the reaction spring is hung on any one of the two reaction spring hanging edges, while the other end of the reaction spring is hung on the yoke.

[0017] Because this invention places the connection between the flexible connection and the excitation conductor between the yoke and the armature of the magnetic trip unit, the length of the conductor between the contact system and the outgoing terminals is significantly shortened. This saves valuable copper resources and reduces costs, while also making the structure more compact and space-saving, and meeting the requirements for miniaturization of circuit breakers. Due to the significant shortening of the excitation conductor, unnecessary energy loss and adverse factors such as temperature rise are avoided. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the conductive circuit of a molded case circuit breaker in the prior art. Figure 2A three-dimensional structural diagram of the yoke and thermal trip unit of the magnetic trip unit in a molded case circuit breaker in the prior art; Figure 3 This is a schematic diagram of the molded case circuit breaker of this utility model; Figure 4 This is a detailed structural diagram of the magnetic trip unit, thermal trip unit, and outgoing terminal of this utility model; Figure 5 for Figure 4 Structural diagram after armature removal; Figure 6 This is a structural diagram of the first embodiment of the fixed end of the excitation conductor and flexible connection of this utility model; Figure 7 This is a structural diagram of the second embodiment of the fixed end of the excitation conductor and flexible connection of this utility model; Figure 8 for Figure 7 A structural diagram after the armature has been removed.

[0019] In the diagram: 1. Housing; 2. Contact system; 21. Moving contact; 211. Moving contact guide rod; 212. Rotating shaft; 213. Flexible connection; 2131. Fixed end; 22. Fixed contact; 3. Arc extinguishing device; 4. Magnetic trip unit; 41. U-shaped yoke; 411. Side plate; 4111. Pivot shaft head support groove; 412. Base plate; 413. Yoke cavity; 42. Armature; 421. Striking rod; 4211. Clamping plate connecting seat; 42111. Pivot shaft head; 42112. Reaction spring hanging edge; 422. Clamping plate; 5. Incoming terminal; 6. Outgoing terminal; 7. Excitation conductor; 71. Connecting part; 8. Thermal trip unit; 81. Conductor connecting part; 811. 82. Avoidance gap; 9. Thermal actuator; 10. Operating mechanism; 11. Cavity. Detailed Implementation

[0020] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0021] In the following description, all directional or orientational concepts such as up, down, left, right, front, and back, unless otherwise stated, are based on... Figure 3 The location and state are taken as a reference, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0022] Please see Figure 3The diagram shows a housing 1, typically composed of a base and a cover, with the cover positioned above the base. The space formed by the base and the cover is a cavity 10. Alternatively, the housing 1 can be composed of a base, a middle cover, and a top cover, with the internal space also being a cavity 10. The diagram shows a contact system 2 and a magnetic trip unit 4 housed within the cavity 10 formed inside the housing 1. In addition to the contact system 2, the magnetic trip unit 4, and the arc-extinguishing device 3, thermal trip unit 8, and operating mechanism 9 mentioned below, optional components such as shunt trip units and auxiliary modules may also be provided within the cavity 10 as needed. The contact system 2 includes a moving contact 21, whose flexible connection 213 is connected to the excitation conductor 7 of the magnetic trip unit 4. The magnetic trip unit 4 includes a U-shaped yoke 41 and an armature 42. The connection between the flexible connection 213 and the excitation conductor 7 is located between the U-shaped yoke 41 and the armature 42 of the magnetic trip unit 4.

[0023] This invention, by placing the connection position of the flexible connection 213 of the moving contact 21 of the aforementioned contact system 2 and the excitation conductor 7 between the yoke 41 and armature 42 of the magnetic trip unit 4, is superior to existing technologies such as... Figure 2 The flexible connection shown first connects to the conductor outside the U-shaped cavity of the yoke, and then the conductor extends into the yoke. The conductor extending into the U-shaped cavity of the yoke serves as the excitation conductor of the electromagnetic trip unit. This existing technology reduces the amount of copper used in the circuit breaker, thereby lowering the cost, and also makes the circuit breaker structure more compact, which is beneficial for the miniaturization of the circuit breaker.

[0024] exist Figure 3 The diagram shows input and output terminals 5 and 6, located at opposite ends (left and right) of the housing 1 and protruding from the cavity 10 for user wiring. Input terminal 5 connects to the power supply, and output terminal 6 connects to the load. Alternatively, input terminal 5 can be connected to the load while output terminal 6 connects to the power supply for reverse wiring. Input and output terminals 5 and 6 extend into the housing 10 and are electrically connected to the contact system 2, thus forming the main conductive circuit of the molded case circuit breaker. Generally, and by… Figure 3As shown, the main conductive circuit includes an input terminal 5, a U-shaped stationary contact of the contact system 2 connected to the input terminal 5, a rigid moving contact guide rod 21 that contacts or separates from the stationary contact, a flexible connection 213 connected to the rigid moving contact guide rod 21, an excitation conductor 7 connected to the flexible connection 213, and an output terminal 6 electrically connected to the excitation conductor 7. The excitation conductor 7 in the magnetic trip unit 4 is generally a straight conductor extending in the same direction as the space formed by the yoke 41 and armature 42 for the excitation conductor 7 to pass through. Since the embodiment given in this invention places the excitation conductor 7 below the height of the output terminal 6, an upward-extending rigid conductor on the right side of the excitation conductor 7 achieves electrical connection with the output terminal 6. Of course, the excitation conductor 7 can also be arranged at the same height as the output terminal 6, extending in a straight line. The rotating shaft 212 of the moving contact 21 is made of plastic material. One end of the moving contact guide rod 211 is connected inside the rotating shaft 212. The rotating shaft 212 is driven by the operating mechanism 9, thereby driving the moving contact 21 to move and realize the separation and closure with the fixed contact 22.

[0025] Please see Figure 4 The aforementioned U-shaped yoke 41 includes side plates 411 and a base plate 412. The side plates 411 are a pair that fold upwards from the front and rear sides of the base plate 412 to form a face-to-face position. These side plates 411 and the base plate 412 together form a U-shaped yoke 41 with a yoke cavity 413. The aforementioned armature 42 includes a striking rod 421 and a snapping plate 422. The lower end of the striking rod 421 forms a snapping plate connecting seat 4211. Fixed to the upward-facing side of the striking plate 422, a pivot head 42111 is formed on the front and rear sides of the right end of the striking plate connecting seat 4211. The pivot head 42111 is rotatably supported on the upper right end of a pair of side plates 411. The upper end of the striking rod 421 extends upward. The striking plate 422 corresponds to the upper cavity opening of the aforementioned yoke cavity 413. The aforementioned excitation conductor 7 passes through the aforementioned yoke cavity 413 and is fixed to the base plate 412 within the yoke cavity 413.

[0026] Depend on Figure 4 As shown, a pivot head support groove 4111 is formed on the upper right end of the aforementioned pair of side plates 411 at a position corresponding to each other. The aforementioned pivot head 42111 is rotatably supported in the pivot head support groove 4111.

[0027] Please see Figure 5 The aforementioned flexible connector 213 is welded to the surface of the excitation conductor 7 facing the aforementioned snap plate 422, i.e., the upward side, via its fixed end 2131 (also referred to as the "end", hereinafter the same).

[0028] Depend on Figure 4 and Figure 7As shown, a reaction spring hanging edge 42112 extends upward from the front and rear sides of the aforementioned snap-fit ​​plate connecting seat 4211. In use, one end of the reaction spring is hung on any one of the two reaction spring hanging edges 42112, while the other end of the reaction spring is hung on the aforementioned U-shaped yoke 41.

[0029] Please see Figure 8 In another embodiment where the excitation conductor 7 is fixedly connected to the fixed end 2131 of the flexible connection 213, the excitation conductor 7 is bent at a position corresponding to the fixed end 2131 to form a connecting portion 71, and the fixed end 2131 of the flexible connection 213 is fastened to the connecting portion 71.

[0030] See the key points Figure 5 and Figure 8 A thermal trip unit 8 is provided in the aforementioned cavity 10. The thermal trip unit 8 includes a conductor connection part 81 and a thermal actuation part 82. The conductor connection part 81 is attached to and fastened to the surface of the excitation conductor 7 facing the aforementioned snap plate 422 in the aforementioned cavity 10. The fixed end 2131 of the aforementioned flexible connection 213 and the conductor connection part 81 are arranged in the aforementioned yoke cavity 413 in a manner that is arranged sequentially from left to right along the extension direction of the excitation conductor 7 (the length direction of the molded case circuit breaker), or partially overlapped or completely overlapped.

[0031] An operating mechanism 9 is provided in the aforementioned cavity 10. The aforementioned moving contact 21 has a rotating shaft 212 located below the operating mechanism 9. The aforementioned operating mechanism 9 drives the rotating shaft 212, which in turn causes the moving contact guide rod 211 of the moving contact 21 connected thereto to separate or close from the fixed contact 22 of the contact system 2. The striking rod 421 of the aforementioned armature 42 cooperates with the operating mechanism 9.

[0032] In this application, the applicant defines the arrangement direction of the incoming terminal 5 and the outgoing terminal 6 as the length direction of the molded case circuit breaker, the direction of the opening and closing movement of the moving contact 21 as the height direction of the molded case circuit breaker, and the side-by-side arrangement direction of the various poles of the molded case circuit breaker as the width direction of the molded case circuit breaker. Generally, the incoming terminal 5 and the outgoing terminal 6 are located at the same height position of the molded case circuit breaker.

[0033] exist Figure 3The above-mentioned operating mechanism 9 is shown. This operating mechanism 9 is located in the upper part of the cavity 10. A handle is located at the top of the operating mechanism 9, extending outside the cavity 10. The operator performs opening, closing, and re-tethering operations on the molded case circuit breaker by moving the handle. When a fault occurs in the circuit containing the molded case circuit breaker, the magnetic trip unit 4 or the thermal trip unit 8 senses the fault current and actuates. For example, the magnetic trip unit 4 actuates by: the fault current flowing through the excitation conductor 7 generating a magnetic field around the excitation conductor 7, such that... Figure 3 The armature 42, which is separated from the U-shaped yoke 41, rotates counterclockwise to attract and seal the U-shaped opening end of the U-shaped yoke 41, as shown. Figure 4 As shown, the striking lever 421 pushes the traction lever of the operating mechanism 9, causing the operating mechanism 9 to trip. Under the action of the main spring inside the operating mechanism 9, the connecting mechanism inside the operating mechanism 9 is driven to move, and finally the rotating shaft 212 connected to the operating mechanism is driven to move. Then, the rotating shaft 212 drives the moving contact guide rod 211 to separate from the fixed contact 22, realizing the tripping of the circuit breaker. The operation of the thermal trip device is as follows: the fault current flows through the excitation conductor 7, causing the excitation conductor 7 to generate heat. The heat is transferred through the conductor connection part 81 that is in close contact with the excitation conductor 7, causing the thermal actuation part 82 to bend due to heat, pushing the traction lever of the operating mechanism 9, causing the operating mechanism 9 to trip.

[0034] Depend on Figure 3 As shown, the aforementioned arc-extinguishing device 3 is also provided in the aforementioned cavity 10. The arc-extinguishing device 3 corresponds to the end of the cavity 10 near the incoming terminal 5 in the length direction of the molded case circuit breaker defined by the arrangement direction of both the incoming terminal 5 and the outgoing terminal 6 of the aforementioned contact system 2. In the height direction of the molded case circuit breaker defined by the operation direction of the aforementioned moving contact 21, the aforementioned excitation conductor 7 extends along the length direction of the molded case circuit breaker at a height position lower than that of the outgoing terminal 6.

[0035] The arc-extinguishing device 3 is used to extinguish the arc generated between the moving contact guide rod 211 and the fixed contact 22 when the moving and stationary contacts separate. Therefore, the arc-extinguishing device 3 is arranged corresponding to the moving and stationary contacts. Generally, the arc-extinguishing device 3 includes several arc-extinguishing grid plates stacked at intervals, with the grid plates stacked along the height direction of the molded case circuit breaker. The arc-extinguishing device 3 is housed in the cavity 10 and located at one end of the length direction of the molded case circuit breaker. It is positioned above the fixed contact 22. The end of the moving contact guide rod 211 extends into the arc-extinguishing device 3 and can move within the arc-extinguishing device 3, so that the arc-burning area of ​​the arc generated between the moving and stationary contacts is located inside the arc-extinguishing device 3, which is beneficial for the movement, elongation, and extinguishing of the arc.

[0036] Below, the applicant describes two specific implementation methods: Example 1: Please refer to Figures 4 to 6The fixed end 2131 of the aforementioned flexible connection 213 is fastened to the surface of the excitation conductor 7 facing the snap plate 422. The fixed end 2131 of the aforementioned flexible connection 213 and the conductor connection portion 81 of the thermal trip unit 8 can be arranged in a straight line along the length of the molded case circuit breaker, or as follows: Figure 6 The fixed end 2131 of the aforementioned flexible connection 213 and the conductor connection portion 81 partially overlap in both the length and width directions of the molded case circuit breaker. Therefore, one corner of the conductor connection portion 81 is recessed inward to form an avoidance notch 811. Figure 6 Show).

[0037] Example 2: See Figures 7 to 8 One side of the aforementioned excitation conductor 7 is bent to form a connecting portion 71, and the fixed end 2131 of the aforementioned flexible connection 213 is fastened to the connecting portion 71. That is, the mounting portion of the flexible connection 213 and the excitation conductor 7 is perpendicular to the mounting portion of the thermal trip unit 8 and the excitation conductor 7. Figure 8 As shown, the fixed end 2131 of the aforementioned flexible connection 213 and the conductor connection portion 81 completely overlap in the length direction of the molded case circuit breaker, but are located at different heights and widths of the circuit breaker.

[0038] In summary, the connection position of the flexible connection 213 of the moving contact 21 of the contact system 2 of this utility model and the excitation conductor 7 is located between the U-shaped yoke 41 and the armature 42 of the magnetic trip unit 4. Compared with the prior art, this is more convenient. Figure 2 The soft connection 213 in the middle is first connected to the conductor outside the U-shaped cavity of the yoke, and the conductor extends into the yoke. The conductor extending into the U-shaped cavity of the yoke serves as the excitation conductor 7 of the electromagnetic trip device 4. This existing technology reduces the amount of copper used in the circuit breaker and lowers the cost. On the other hand, it makes the circuit breaker structure compact and is conducive to the miniaturization of the circuit breaker.

[0039] Of course, the yoke of this utility model is not limited to the U-shaped structure given in the above embodiments. The armature's striking plate can also be set as a U-shaped structure, while the yoke that cooperates with it can be set as a flat plate structure.

Claims

1. A molded case circuit breaker, comprising a housing (1); a contact system (2) and a magnetic trip unit (4) disposed within a cavity (10) formed inside the housing (1); the contact system (2) comprising a moving contact (21), the flexible connection (213) of the moving contact (21) being connected to the excitation conductor (7) of the magnetic trip unit (4), the magnetic trip unit (4) comprising a yoke (41) and an armature (42), characterized in that: The connection position of the flexible connector (213) and the excitation conductor (7) is located between the yoke (41) and armature (42) of the magnetic trip unit (4); the yoke (41) includes a side plate (411) and a bottom plate (412). The side plate (411) has a pair of side plates that fold upward from the front and rear sides of the bottom plate (412) to form a face-to-face position. The pair of side plates (411) and the bottom plate (412) together form a U-shaped yoke (41) with a yoke cavity (413). The armature (42) The device includes a striking rod (421) and a snap plate (422); the upper end of the striking rod (421) extends upward, and the snap plate (422) corresponds to the upper cavity opening of the yoke cavity (413); the excitation conductor (7) passes through the yoke cavity (413) and is fixed to the base plate (412) inside the yoke cavity (413); the flexible connection (213) is welded to the side surface of the excitation conductor (7) facing the snap plate (422) through its fixed end (2131).

2. The molded case circuit breaker according to claim 1, characterized in that: The lower end of the striking rod (421) is provided with a striking plate connecting seat (4211), which is fixed to the upward-facing side of the striking plate (422). A pivot head (42111) is provided on the front and rear sides of the right end of the striking plate connecting seat (4211), and the pivot head (42111) is rotatably supported on the upper right end of a pair of side plates (411).

3. The molded case circuit breaker according to claim 2, characterized in that: On the upper right end of the pair of side plates (411) and at corresponding front and rear positions, there are pivot head support grooves (4111) in which the pivot heads (42111) are rotatably supported.

4. The molded case circuit breaker according to claim 1, characterized in that: The excitation conductor (7) is bent at a position corresponding to the fixed end (2131) to form a connecting part (71), and the fixed end (2131) of the flexible connection (213) is fastened to the connecting part (71).

5. The molded case circuit breaker according to claim 4, characterized in that: A thermal trip unit (8) is also provided in the cavity (10). The thermal trip unit (8) includes a conductor connection part (81) and a thermal actuation part (82). The conductor connection part (81) is attached and fastened to the surface of the excitation conductor (7) facing the snap plate (422) in the yoke cavity (413). The fixed end (2131) of the flexible connection (213) and the conductor connection part (81) are arranged in the yoke cavity (413) in sequence along the extension direction of the excitation conductor (7) or partially or completely overlap.

6. The molded case circuit breaker according to claim 1, characterized in that: An arc-extinguishing device (3) is also provided in the cavity (10). The arc-extinguishing device (3) is located at the end of the cavity (10) near the input terminal (5) in the length direction of the molded case circuit breaker, which is defined by the arrangement direction of both the input terminal (5) and the output terminal (6). In the height direction of the molded case circuit breaker, which is defined by the operation direction of the moving contact (21), the excitation conductor (7) extends along the length direction of the molded case circuit breaker at a height position lower than that of the output terminal (6).

7. The molded case circuit breaker according to claim 1, characterized in that: An operating mechanism (9) is also provided in the cavity (10). The moving contact (21) has a rotating shaft (212) located below the operating mechanism (9). The operating mechanism (9) drives the rotating shaft (212), which in turn drives the moving contact guide rod (211) of the moving contact (21) connected to it to separate or close from the fixed contact (22) of the contact system (2). The striking rod (421) of the armature (42) cooperates with the operating mechanism (9).

8. The molded case circuit breaker according to claim 2, characterized in that: A reaction spring hanging edge (42112) extends upward from the front and rear sides of the flapping plate connecting seat (4211). In use, one end of the reaction spring is hung on one of the two reaction spring hanging edges (42112), while the other end of the reaction spring is hung on the yoke (41).

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