circuit breaker

Abstract

A circuit breaker includes a housing, an operating mechanism, and at least one circuit breaker pole. The operating mechanism and the circuit breaker pole are disposed within the housing along a second direction. The circuit breaker pole includes a contact system and a protection mechanism. The contact system includes a moving contact assembly and two stationary contacts. The moving contact assembly is rotatably assembled and drivenly connected to the operating mechanism. The two stationary contacts are rotationally symmetrically disposed on both sides of the moving contact assembly. In a first direction, the stationary contact located on the opposite side of the operating mechanism from the moving contact assembly is the first stationary contact, and the other stationary contact is the second stationary contact located on the same side of the moving contact assembly as the operating mechanism. A protection mechanism is coupled to at least the first stationary contact. The protection mechanism is disposed along the first direction and extends towards the operating mechanism. The protection mechanism includes a short-circuit protection mechanism and an overload protection mechanism arranged side by side in a third direction. In this invention, the space between the operating mechanism and the first stationary contact is fully utilized, which helps to reduce the overall width of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device used to disconnect and connect load circuits, as well as to disconnect faulty circuits to prevent the escalation of accidents and thus ensure the safe operation of load circuits. Existing circuit breakers typically include protection mechanisms, such as short-circuit protection and overload protection. When a circuit breaker uses a rotating double-break contact system, in order to meet the requirements of coordination with the operating mechanism, but also due to internal space constraints, the protection mechanism is usually located between the arc-extinguishing chamber and the terminal blocks. This, to some extent, increases the overall width of the circuit breaker. Utility Model Content

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a circuit breaker, including a housing, an operating mechanism, and at least one circuit breaker pole. The operating mechanism and the circuit breaker pole are disposed within the housing along a second direction. The circuit breaker pole includes a contact system and a protection mechanism. The contact system includes a moving contact assembly and two stationary contacts. The moving contact assembly is rotatably assembled and drivenly connected to the operating mechanism. The two stationary contacts are rotationally symmetrically disposed on both sides of the moving contact assembly. In a first direction, the stationary contact located on the opposite side of the moving contact assembly from the operating mechanism is the first stationary contact, and the other stationary contact is the second stationary contact located on the same side of the moving contact assembly as the operating mechanism.

[0006] At least one protection mechanism is coupled to the first stationary contact. The protection mechanism is arranged along a first direction and extends toward the operating mechanism to trigger the operating mechanism to trip. The protection mechanism includes a short-circuit protection mechanism and an overload protection mechanism arranged side by side in a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0007] Preferably, the operating mechanism is also linked to a handle mechanism. In a first direction, the handle mechanism and the operating mechanism are arranged side by side. In a second direction, the protection mechanism is located between the handle mechanism and the first stationary contact.

[0008] Preferably, the operating mechanism includes an unlocking part, and the armature of the short-circuit protection mechanism and the bimetallic component of the overload protection mechanism respectively cooperate with the unlocking part.

[0009] Each circuit breaker pole includes an operating mechanism. The unlocking part of the same circuit breaker pole is triggered by an armature or a bimetallic component. Alternatively, an operating mechanism is provided inside the housing, with the unlocking part extending through the housing in a third direction. The armatures and bimetallic components in all circuit breaker poles cooperate with the same unlocking part.

[0010] Preferably, the circuit breaker pole further includes a housing and a pair of terminals. The pair of terminals are spaced apart and correspondingly disposed in the outer casing outside the two ends of the housing in a first direction. The contact system and protection mechanism are disposed inside the housing, and the two stationary contacts are respectively connected to the adjacent terminals.

[0011] Preferably, the operating mechanism is located in the outer shell outside the housing, and the operating mechanism is in communication with at least one housing. The side walls of the other housings are provided with through holes, and the tail end of the armature and one end of the bimetallic component pass through the through holes and correspond to the unlocking part.

[0012] Preferably, the short-circuit protection mechanism includes a magnetic yoke, an armature, and a conductive plate. The magnetic yoke and the armature are spaced apart and opposite each other. The conductive plate is coupled to an adjacent first stationary contact and passes between the magnetic yoke and the armature. The tail end of the armature is used to trigger the tripping of the operating mechanism.

[0013] The overload protection mechanism includes a bimetallic component, one end of which is coupled to an adjacent first stationary contact, and the other end of which is used to trigger the tripping of the operating mechanism.

[0014] Preferably, the system further includes an arc-extinguishing system comprising two arc-extinguishing chambers spaced apart in a first direction, with the contact system located between the two arc-extinguishing chambers. In a second direction, the first stationary contact is located between one arc-extinguishing chamber and the operating mechanism, and the other arc-extinguishing chamber is located between the second stationary contact and the operating mechanism.

[0015] Preferably, the stationary contact includes a stationary contact plate, one end of which is provided with a stationary contact point. A moving contact portion of the moving contact assembly is spaced apart from a stationary contact point in a second direction. The middle portion of the stationary contact plate is bent at least once, so that the other end of the stationary contact plate extends along a first direction outside the adjacent arc-extinguishing chamber. The protection mechanism is coupled to the stationary contact plate of the first stationary contact.

[0016] Preferably, the housing includes at least two circuit breaker poles, with two adjacent circuit breaker poles arranged side by side in a third direction. One circuit breaker pole serves as a short-circuit protection pole, and the protection mechanism of the short-circuit protection pole includes only a short-circuit protection mechanism. The other circuit breaker pole serves as an overload protection pole, and the protection mechanism of the overload protection pole includes only an overload protection mechanism.

[0017] Preferably, the moving contact assemblies of two adjacent circuit breaker poles are linked together. The moving contact assembly includes a rotating shaft and a moving contact bridge. The rotating shaft is rotatably assembled, and the moving contact bridge is assembled radially at the middle of the rotating shaft. The two ends of the moving contact bridge extend beyond the rotating shaft as two moving contact portions. The rotating shaft is provided with a first linkage shaft, which is used to link two adjacent moving contact assemblies. The operating mechanism is linked to at least one of the first linkage shafts.

[0018] The circuit breaker of this utility model fully utilizes the space between the operating mechanism and the first stationary contact by coupling the protection mechanism to the first stationary contact near the operating mechanism. The protection mechanism is arranged along the first direction and extends towards the operating mechanism, thus avoiding the need to place the protection mechanism between the arc-extinguishing chamber and the terminal block, which helps to reduce the overall width of the circuit breaker.

[0019] In addition, each circuit breaker pole is equipped with a housing, which facilitates the formation of a modular structure and simplifies the assembly process.

[0020] In addition, each circuit breaker pole is equipped with an operating mechanism, which improves the stability of the cooperation between the protection mechanism and the operating mechanism. Alternatively, only one operating mechanism can be set up to simplify the structure and assembly process and reduce costs.

[0021] In addition, the stationary contact plate of the first stationary contact extends along the outer side of the arc extinguishing chamber and couples with the protection mechanism, so that the protection mechanism is coupled to the first stationary contact nearby, which simplifies the wiring process, saves internal space, and facilitates the connection between the protection mechanism and the stationary contact.

[0022] Furthermore, in applications where grounding systems are not considered, the simplified protection mechanism can be used to form separate short-circuit protection electrodes and overload protection electrodes, avoiding the need to connect too many protection mechanisms. This simplifies assembly and reduces costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker of this utility model after the overload protection mechanism has been removed. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker of this utility model after the short-circuit protection mechanism has been removed. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the internal structure of the circuit breaker pole of this utility model. Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker pole of this utility model. Figure 2 ;

[0027] Figure label:

[0028] 11-Housing, 111-Terminal, 112-Operating terminal, 2-Operating mechanism, 234-Unlocking part, 31-Moving contact assembly, 311-Moving contact bridge, 312-Shaft, 321-First stationary contact, 322-Second stationary contact, 41-Arc extinguishing chamber, 42-Exhaust channel, 43-Stationary arc ignition plate, 5-Short circuit protection mechanism, 6-Overload protection mechanism, 7-Terminal, 70-Conductive plate, 8-Handle mechanism. Detailed Implementation

[0029] The specific embodiments of the circuit breaker of this utility model are further described below with reference to the accompanying drawings. The circuit breaker of this utility model is not limited to the descriptions in the following embodiments.

[0030] The circuit breaker includes a housing 11, within which an operating mechanism 2 and at least one circuit breaker pole are disposed. Each circuit breaker pole includes a pair of spaced-apart terminals 7. A contact system is connected between the pair of terminals 7. The contact system includes a moving contact assembly 31 and a stationary contact that cooperate with each other. The operating mechanism 2 drives the moving contact assembly 31 to contact or separate from the stationary contact, thereby connecting or disconnecting the main line of each circuit breaker pole. The contact system is also equipped with an arc extinguishing system, which extinguishes the arc generated when the contact system breaks.

[0031] Preferably, the circuit breaker pole is also provided with a protection mechanism, which includes a short-circuit protection mechanism 5 and / or an overload protection mechanism 6. The short-circuit protection mechanism 5 and the overload protection mechanism 6 are respectively connected to the main line of the circuit breaker pole and cooperate with the operating mechanism 2. When a short-circuit fault occurs, the short-circuit protection mechanism 5 triggers the operating mechanism 2 to trip. When an overload fault occurs, the overload protection mechanism 6 triggers the operating mechanism 2 to trip.

[0032] For ease of description, the length, height, and width of the circuit breaker are used to represent the first direction, the second direction, and the third direction, respectively. Figure 1-4 As shown, the left-right direction is the first direction, the up-down direction is the second direction, and the direction perpendicular to the paper is the third direction. The first, second, and third directions are perpendicular to each other.

[0033] like Figure 1 , 2As shown, in the second direction, the operating mechanism 2 is positioned above the contact system. The contact system adopts a rotating double-break structure, including a moving contact assembly 31 and two stationary contacts. In the first direction, the moving contact assembly 31 is rotatably mounted between the two stationary contacts. The moving contact assembly 31 includes two moving contact portions, each of which is spaced apart from one stationary contact in the second direction. The two stationary contacts form a rotationally symmetrical structure and are positioned on both sides of the moving contact assembly 31. In the figure, in the second direction, one of the stationary contacts, as the first stationary contact 321, is positioned close to the operating mechanism 2, and the first stationary contact 321 and the operating mechanism 2 are located on opposite sides of the moving contact assembly 31. The other stationary contact, as the second stationary contact 322, is positioned away from the operating mechanism 2, and the second stationary contact 322 and the operating mechanism 2 are located on the same side of the moving contact assembly 31. That is, the first stationary contact 321 is located at the upper left of the circuit breaker in the figure, and the second stationary contact 322 is located at the lower right of the circuit breaker in the figure.

[0034] The improvement of this application is that at least one protection mechanism is coupled on the first stationary contact 321. The protection mechanism is arranged along the first direction and extends toward the operating mechanism 2 to trigger the operating mechanism 2 to trip. The protection mechanism includes a short-circuit protection mechanism 5 and an overload protection mechanism 6 arranged side by side in the third direction.

[0035] Thus, by coupling the protection mechanism to the first stationary contact 321 near the operating mechanism 2, and by setting the protection mechanism along the first direction and extending it towards the operating mechanism 2, the space between the operating mechanism 2 and the first stationary contact 321 is fully utilized, avoiding the protection mechanism being placed between the arc-extinguishing chamber 41 and the terminal 7, which helps to reduce the overall width of the circuit breaker.

[0036] Typically, each circuit breaker pole also includes a pair of terminals 7, which are spaced apart in a first direction. The contact system is located between the pair of terminals 7, and two stationary contacts are connected to the adjacent terminals 7 respectively, so that the contact system can connect or disconnect the main line of each circuit breaker pole.

[0037] Preferably, each circuit breaker pole also includes a housing, which provides assembly space for the contact system, arc extinguishing system and protection mechanism. The wiring terminals 7 of each circuit breaker pole can be located inside the housing or in the outer casing 11. The housing allows the circuit breaker pole to form a modular structure, which is convenient for assembly in the outer casing 11. Of course, the housing can also be omitted, and adjacent circuit breaker poles can be separated by a partition located in the outer casing 11.

[0038] Furthermore, the operating mechanism 2 includes an unlocking part 234. The armature of the short-circuit protection mechanism 5 and the bimetallic component of the overload protection mechanism 6 respectively cooperate with the unlocking part 234. Each circuit breaker pole is provided with an operating mechanism 2, so that the armature and bimetallic component in each circuit breaker pole cooperate with the unlocking part 234 respectively, which improves the stability of the cooperation between the protection mechanism and the operating mechanism 2 and ensures the safety of product use. In addition, only one operating mechanism 2 can be provided in the housing 11. The unlocking part 234 is provided through the housing 11 along the third direction. The armature and bimetallic component of all circuit breaker poles cooperate with the same unlocking part 234, which can reduce the number of operating mechanisms 2 configured, which is conducive to reducing the size and cost.

[0039] Combination Figure 1-4 A specific embodiment of a circuit breaker is provided.

[0040] The circuit breaker includes a housing 11, and an operating mechanism 2 and at least one circuit breaker pole are provided inside the housing 11. In this embodiment, two circuit breaker poles are provided inside the housing 11. Of course, more circuit breaker poles can also be provided, as long as it is ensured that two adjacent circuit breaker poles are arranged side by side in a third direction.

[0041] like Figure 1-4 As shown, the opposite ends of the outer casing 11 serve as terminals 111. Each terminal 111 is provided with an operating hole and a wiring port. The central axis of the wiring port is parallel to the first direction, and the central axis of the operating hole is parallel to the second direction. The side wall of the outer casing 11 connecting the two terminals 111 protrudes outward to form an operating end 112. That is, the side wall of the outer casing 11 connecting the two terminals 111 protrudes outward along the second direction to form an operating end 112. The operating end 112 is provided with a handle hole, and the central axis of the handle hole is parallel to the second direction. It should be noted that when there are two or more operating holes in the same terminal 111, the two adjacent operating holes are arranged side by side in the third direction. Correspondingly, when there are two or more handle holes, the handle holes are also arranged side by side in the third direction. In this embodiment, the outer casing 11 includes a cover and a base. The cover is fitted onto the base, and the operating mechanism 2 and the circuit breaker pole are disposed together between the cover and the base.

[0042] like Figure 1 , 2As shown, in the second direction, the operating mechanism 2 corresponds to the top of a circuit breaker pole. Each circuit breaker pole includes a housing. The operating mechanism 2 is in communication with at least one of the circuit breaker poles. In this embodiment, the operating mechanism 2 is disposed in one of the housings. Preferably, a mounting part is formed by protruding outward from the middle of one side of the housing along the second direction. The mounting part is correspondingly disposed in the operating end 112 of the housing 11. The mounting part and the operating end 112 are provided with handle holes. The operating mechanism 2 is rotatably assembled in the mounting part. The middle of the remaining housings is provided with through holes. The central axis of the through holes is parallel to the second direction.

[0043] like Figure 1 , 2 As shown, the operating mechanism 2 includes a lever, a snap hook, and a latch. The lever is rotatably mounted in the mounting part. The snap hook and the latch are rotatably mounted on the lever, and in the third direction, the snap hook and the latch are stacked on the lever. One end of the latch engages with the snap hook, and the other end of the latch is provided with an unlocking part 234. The unlocking part 234 protrudes in the third direction, and a part of the unlocking part 234 is located in the mounting part, while the other part passes through the drive hole opened on the side wall of the mounting part and is disposed in the housing 11 in the third direction.

[0044] Furthermore, the operating mechanism 2 is also connected to a handle mechanism 8. The handle mechanism 8 and the operating mechanism 2 are assembled together in the mounting part. The handle mechanism 8 and the operating mechanism 2 are arranged side by side in the first direction. The handle mechanism 8 can adopt existing technology, that is, the handle mechanism 8 is linked to the lever through a U-shaped connecting rod. The handle part of the handle mechanism 8 extends from the handle hole to the outside of the housing 11 for manually operating the opening and closing of the circuit breaker.

[0045] like Figure 1-4 As shown, each circuit breaker pole also includes a pair of terminals 7, a contact system, a protection mechanism, and an arc extinguishing system. The pair of terminals 7 are spaced apart and opposite each other in the first direction. The terminals 7 can be disposed inside the housing. When the terminals 7 are located inside the housing, the area of ​​the housing corresponding to the terminals 111 needs to be provided with a wiring port and an operating hole corresponding to the terminals 7. In this embodiment, the terminals 7 are disposed inside the outer shell 11 outside both ends of the housing, which can avoid providing operating holes on the housing. Each terminal 7 corresponds to the operating hole and wiring port of the terminals 111.

[0046] The contact system and arc extinguishing system are housed within a housing between a pair of terminals 7. The contact system includes a rotating shaft 312 and two stationary contacts. The rotating shaft 312 is rotatably positioned in the middle of the housing and has a contact cavity in its center. The contact cavity is arranged radially along the rotating shaft 312. A moving contact bridge 311 is located in the middle of the rotating shaft 312, with each end of the moving contact bridge 311 serving as a moving contact portion. Each moving contact portion extends beyond the rotating shaft 312. The two stationary contacts are rotationally symmetrically arranged on opposite sides of the moving contact assembly 31. For ease of description, the two stationary contacts are referred to as a first stationary contact 321 and a second stationary contact 322. In one direction, the first stationary contact 321 and the second stationary contact 322 are located on opposite sides of the contact system, the first stationary contact 321 and the operating mechanism 2 are located on opposite sides of the contact system, and the second stationary contact 322 and the operating mechanism 2 are located on the same side of the contact system. In the second direction, the first stationary contact 321 is closer to the operating mechanism 2, the handle mechanism is located above the first stationary contact 321, and the second stationary contact 322 is farther away from the operating mechanism 2. That is, the first stationary contact 321 is located between the moving contact assembly 31 and the operating mechanism 2, and the second stationary contact 322 and the operating mechanism 2 are located between the moving contact assembly 31.

[0047] Furthermore, two adjacent moving contact assemblies 31 are linked together via a first linkage shaft. Specifically, the circular end face of the rotating shaft 312 serves as the mounting surface. The rotating shaft 312 is rotatably assembled into the housing via the mounting surface. A contact cavity is provided in the middle of the rotating shaft 312, and the contact cavity is radially connected to the rotating shaft 312. A moving contact bridge 311 is disposed through the contact cavity, so that the two ends of the moving contact bridge 311 serve as two moving contact parts, each of which has a moving contact point. The two moving contact parts extend beyond the rotating shaft 312 and respectively cooperate with two stationary contacts. A first linkage hole is provided on the mounting surface of the rotating shaft 312 at a position off the axis. A first linkage shaft is inserted into the first mating hole of two adjacent rotating shafts 312, and the first linkage shaft passes through the first mating hole opened on the side wall of the housing. The operating mechanism 2 is linked together with one of the first linkage shafts. Preferably, a linkage element is connected between the first linkage shaft on one of the rotating shafts 312 and the lever of the operating mechanism 2, thereby realizing the linkage connection with the operating mechanism 2.

[0048] Each stationary contact includes a stationary contact plate, one end of which is provided with a stationary contact point. The end with the stationary contact point is spaced apart from a moving contact in a second direction. The middle of the stationary contact plate is bent at least once, so that the other end of the stationary contact plate extends toward an adjacent terminal 7 in a first direction.

[0049] like Figure 1-4As shown, the arc extinguishing system includes two arc extinguishing chambers 41. The arc inlets of the two arc extinguishing chambers 41 are spaced apart and opposite each other in a first direction. In the figure, the two arc extinguishing chambers 41 are arranged side by side in a direction that is slightly angled to the first direction. The exhaust end of each arc extinguishing chamber 41 faces away from the arc inlet and towards the adjacent terminal 7. The exhaust end is provided with multiple exhaust holes. The contact system is arranged between the two arc extinguishing chambers 41. In a second direction, the first stationary contact 321 is located between one arc extinguishing chamber 41 and the operating mechanism 2, and the other arc extinguishing chamber 41 is located between the second stationary contact 322 and the operating mechanism 2. That is, the first stationary contact 321 corresponds to the end of one arc extinguishing chamber 41 that is closer to the operating mechanism 2. In the figure, the stationary contact plate of the first stationary contact 321 extends along the first direction to the outside of one arc extinguishing chamber 41 that is closer to the operating mechanism 2, and the stationary contact plate of the second stationary contact 322 extends along the first direction to the outside of the other arc extinguishing chamber 41 that is away from the operating mechanism 2.

[0050] The arc-extinguishing system may also include an exhaust channel 42, which connects the exhaust end of each arc-extinguishing chamber 41 to an exhaust port disposed on the housing. Figure 1 , 2 In the second direction, the exhaust port of one terminal 111 is located below the terminal 7 at the same end. In the third direction, the exhaust port of the other terminal 11 is arranged side by side with the terminal 7 at the same end. The exhaust gas discharged from the arc-extinguishing chamber 41 is buffered and cooled by the exhaust channel 42 to prevent the high-temperature exhaust gas from being directly discharged from the circuit breaker. Furthermore, the arc-extinguishing system also includes an arc-initiating structure. The arc-initiating structure is located at the arc inlet and cooperates with the contact system. The arc-initiating structure includes a moving arc-initiating part and a stationary arc-initiating plate 43. The moving arc-initiating part is preferably arranged on the moving contact assembly 31. The stationary arc-initiating plate 43 cooperates with the stationary contact. That is, one end of the stationary arc-initiating plate 43 is connected to the stationary contact plate with the stationary contact point, and the other end extends into the arc-extinguishing chamber 41.

[0051] Of course, in this embodiment, the operating mechanism 2, the contact system, and the arc extinguishing system can also adopt existing technologies.

[0052] like Figure 1-4As shown, the protection mechanism is coupled to the first stationary contact 321. The protection mechanism is arranged along the first direction and extends towards the operating mechanism 2. It can be understood that the protection mechanism is arranged laterally. The protection mechanism extends along the direction towards the operating mechanism 2 on the side of the first stationary contact 321 opposite to the second stationary contact 322. Of course, the protection mechanism is also located in the space between the handle mechanism 8 and the first stationary contact 321. Specifically, the protection mechanism is coupled to the stationary contact plate of the first stationary contact 321. In the second direction, the protection mechanism is arranged laterally between the operating mechanism 2 and the first stationary contact 321. The protection mechanism and the operating mechanism 2 are located on opposite sides of the contact system in the first direction, so that at least a part of the protection mechanism extends inclined towards the operating mechanism 2. The angle between its extension direction and the first direction is between 10 and 30°. When a fault occurs in the main line of the circuit breaker pole, the operating mechanism 2 is triggered to trip. The protection mechanism is coupled to the first stationary contact 321, making full use of the distance between the operating mechanism 2 and the first stationary contact 321, avoiding the protection mechanism being placed between the arc-extinguishing chamber 41 and the terminal 7, which helps to reduce the overall width of the circuit breaker.

[0053] The protection mechanism includes a short-circuit protection mechanism 5 and / or an overload protection mechanism 6. When both the short-circuit protection mechanism 5 and the overload protection mechanism 6 are installed in the same circuit breaker pole, the short-circuit protection mechanism 5 and the overload protection mechanism 6 can be coupled together to the first stationary contact 321 or to the second stationary contact 322. In the same circuit breaker pole, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side in the third direction.

[0054] Specifically, the short-circuit protection mechanism 5 includes a magnetic yoke, an armature, a conductive plate 70, and a support. The magnetic yoke and the armature are spaced apart and opposite each other in a second direction. The first end of the armature is rotatably connected to the support, and the tail end of the armature extends towards the operating mechanism 2. The angle between the extension direction of the armature and the first direction is between 10° and 30°. The conductive plate 70 is coupled to the adjacent first stationary contact 321 and passes between the magnetic yoke and the armature. Of course, the stationary contact plate of the first stationary contact 321 can also serve as the conductive plate 70, passing through the conductor cavity between the magnetic yoke and the armature. When the conductive plate 70 (the first stationary contact 321) passes through the conductor cavity between the magnetic yoke and the armature, the short-circuit protection mechanism 5 is activated. After a short-circuit current flows through the stationary contact plate of the stationary contact 321, the magnetic yoke and the armature cooperate to generate a magnetic field to drive the tail end of the armature to rotate towards the magnetic yoke. The tail end of the armature triggers the tripping of the operating mechanism 2. The elastic element connected between the armature and the bracket can drive the armature to reset. The overload protection mechanism 6 includes a bimetallic component, which is inclined and the angle between the bimetallic component and the first direction is between -30° and -10°. One end of the bimetallic component is coupled to the adjacent first stationary contact 321, and the other end of the bimetallic component is used to trigger the tripping of the operating mechanism 2.

[0055] In addition, such as Figure 4As shown, a protection mechanism can also be coupled to the second stationary contact 322. However, in each circuit breaker pole, the first stationary contact 321 and the second stationary contact 322 are not equipped with protection mechanisms at the same time. That is, in each circuit breaker pole, at most one short-circuit protection mechanism 5 and one overload protection mechanism 6 are provided. In the first direction, the protection mechanism coupled to the second stationary contact 322 is located between the second stationary contact 322 and the adjacent terminal 7. At least a portion of the protection mechanism coupled to the second stationary contact 322 extends along the second direction toward the operating mechanism 2. In this case, it can be understood that the protection mechanism is set vertically, triggering the operating mechanism 2 to trip. Since the distance between the protection mechanism coupled to the second stationary contact 322 and the operating mechanism 2 is relatively far, the unlocking part 234 of the latch can extend in the second direction, or a connecting and cooperating component (not shown) can be connected between the unlocking part 234 and the protection mechanism coupled to the second contact mechanism.

[0056] like Figure 4 As shown, the protection mechanisms with the same structure are coupled to the first stationary contact 321 or the second stationary contact 322. However, in the short-circuit protection mechanism 5 coupled to the second stationary contact 322, the magnetic yoke and the armature are spaced apart and opposite each other in the first direction. Correspondingly, the stationary contact plate of the second stationary contact 322 also passes through the space between the magnetic yoke and the armature as a conductive plate 70. The bimetallic component of the overload protection mechanism 6 is arranged along the second direction and extends towards the direction close to the operating mechanism 2.

[0057] Furthermore, in applications where grounding systems are not considered, the protection mechanism in each circuit breaker pole can be simplified. For example, one circuit breaker pole may only have a short-circuit protection mechanism 5, thus making the circuit breaker pole a short-circuit protection pole, and the other circuit breaker pole may only have an overload protection mechanism 6, thus making the circuit breaker pole an overload protection pole. Preferably, the protection mechanisms in two adjacent circuit breaker poles are arranged side by side in the third direction. That is, the short-circuit protection mechanism 5 is coupled to the first stationary contact 321 of one short-circuit protection pole, and the overload protection mechanism 6 is coupled to the first stationary contact 321 of the overload protection pole. In this case, the short-circuit protection mechanism 5 and the overload protection mechanism 6 are arranged side by side in the third direction. Alternatively, the short-circuit protection mechanism 5 is coupled to the second stationary contact 322 of the short-circuit protection pole, and correspondingly, the overload protection mechanism 6 is also coupled to the second stationary contact 322 of the overload protection pole.

[0058] Of course, in this embodiment, the armature and / or bimetallic component of the protective mechanism located in the same housing as the operating mechanism 2 do not need to pass through the perforation and can directly cooperate with the unlocking part 234 located in the same housing. Alternatively, each housing may be equipped with the operating mechanism 2. The tail end of the armature and / or one end of the bimetallic component of the protective mechanism located in a different housing from the operating mechanism 2 can pass through the perforation of the housing and cooperate with the unlocking part 234 located in the outer shell 11.

[0059] In another embodiment, the operating mechanism 2 is not housed in any one of the housings. In this case, the tail end of the armature of each circuit breaker pole and / or one end of the bimetallic component protrude from the perforation of their respective housings and cooperate with the unlocking part 234 provided in a third direction.

[0060] Furthermore, both the armature and the bimetallic assembly cooperate with the unlocking part 234 of the latch 23. To increase the insulation performance between the armature and the bimetallic assembly, an insulating element can be provided at the tail end of the armature and / or one end of the bimetallic assembly, or an insulating element can be provided between the tail end of the armature and / or one end of the bimetallic assembly. Of course, the insulating element and the insulating element can also be integrally provided on the latch 23.

[0061] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0062] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising a housing (11), an operating mechanism (2), and at least one circuit breaker pole, wherein the operating mechanism (2) and the circuit breaker pole are disposed within the housing (11) along a second direction, wherein the circuit breaker pole comprises a contact system and a protection mechanism, wherein the contact system comprises a moving contact assembly (31) and two stationary contacts, wherein the moving contact assembly (31) is rotatably assembled and drivenly connected to the operating mechanism (2), and the two stationary contacts are arranged in rotational symmetry on both sides of the moving contact assembly (31), wherein in a first direction, the stationary contact located on the opposite side of the moving contact assembly (31) to the operating mechanism (2) is a first stationary contact (321), and the other stationary contact is a second stationary contact (322) located on the same side of the moving contact assembly (31) as the operating mechanism (2); Its features are: At least one protection mechanism is coupled to the first stationary contact (321), the protection mechanism being arranged along a first direction and extending toward the operating mechanism (2) to trigger the operating mechanism (2) to trip, the protection mechanism including a short-circuit protection mechanism (5) and an overload protection mechanism (6) arranged side by side in a third direction, the first direction, the second direction and the third direction being perpendicular to each other.

2. The circuit breaker according to claim 1, characterized in that: The operating mechanism (2) is also linked to a handle mechanism (8). In the first direction, the handle mechanism (8) and the operating mechanism (2) are arranged side by side. In the second direction, the protection mechanism is located between the handle mechanism (8) and the first stationary contact (321).

3. The circuit breaker according to claim 1, characterized in that: The operating mechanism (2) includes an unlocking part (234), and the armature of the short-circuit protection mechanism (5) and the bimetallic component of the overload protection mechanism (6) respectively cooperate with the unlocking part (234). Each circuit breaker pole includes an operating mechanism (2). The unlocking part (234) of the same circuit breaker pole is triggered by an armature or a bimetallic component. Alternatively, an operating mechanism (2) is provided inside the housing (11). The unlocking part (234) is disposed through the housing (11) in a third direction. The armatures and bimetallic components in all circuit breaker poles cooperate with the same unlocking part (234).

4. The circuit breaker according to claim 3, characterized in that: The circuit breaker also includes a housing and a pair of terminals (7). The pair of terminals (7) are spaced apart and correspondingly disposed in the outer casing (11) outside the two ends of the housing in a first direction. The contact system and protection mechanism are disposed inside the housing. The two stationary contacts are respectively connected to the adjacent terminals (7).

5. The circuit breaker according to claim 4, characterized in that: The operating mechanism (2) is located in the outer shell outside the housing, and the operating mechanism (2) is connected to at least one housing. The side walls of the other housings are provided with through holes. The tail end of the armature and one end of the double metal assembly pass through the through holes and correspond to the unlocking part (234).

6. The circuit breaker according to any one of claims 1-5, characterized in that: The short-circuit protection mechanism (5) includes a magnetic yoke, an armature, and a conductive plate (70). The magnetic yoke and the armature are spaced apart and opposite each other. The conductive plate (70) is coupled to an adjacent first stationary contact (321) and passes between the magnetic yoke and the armature. The tail end of the armature is used to trigger the operating mechanism (2) to trip. The overload protection mechanism (6) includes a bimetallic component, one end of which is coupled to an adjacent first stationary contact (321), and the other end of which is used to trigger the tripping of the operating mechanism (2).

7. The circuit breaker according to claim 6, characterized in that: It also includes an arc extinguishing system, which includes two arc extinguishing chambers (41) spaced apart in a first direction. The contact system is located between the two arc extinguishing chambers (41). In the second direction, the first stationary contact (321) is located between one arc extinguishing chamber (41) and the operating mechanism (2), and the other arc extinguishing chamber (41) is located between the second stationary contact (322) and the operating mechanism (2).

8. The circuit breaker according to claim 7, characterized in that: The stationary contact includes a stationary contact plate, one end of which is provided with a stationary contact point. A moving contact portion of the moving contact assembly (31) is spaced apart from a stationary contact point in a second direction. The middle portion of the stationary contact plate is bent at least once, so that the other end of the stationary contact plate extends along a first direction outside the adjacent arc-extinguishing chamber (41). The protection mechanism is coupled to the stationary contact plate of the first stationary contact (321).

9. The circuit breaker according to claim 6, characterized in that: The housing (11) includes at least two circuit breaker poles, with two adjacent circuit breaker poles arranged side by side in the third direction. One of the circuit breaker poles serves as a short-circuit protection pole, and the protection mechanism of the short-circuit protection pole includes only a short-circuit protection mechanism (5). The other circuit breaker pole serves as an overload protection pole, and the protection mechanism of the overload protection pole includes only an overload protection mechanism (6).

10. The circuit breaker according to claim 9, characterized in that: The moving contact assemblies (31) of two adjacent circuit breaker poles are linked together. The moving contact assembly (31) includes a rotating shaft (312) and a moving contact bridge (311). The rotating shaft (312) is rotatably assembled. The moving contact bridge (311) is assembled radially at the middle of the rotating shaft (312). The two ends of the moving contact bridge (311) extend beyond the rotating shaft (312) as two moving contact parts. The rotating shaft (312) is provided with a first linkage shaft. The first linkage shaft is used to link two adjacent moving contact assemblies (31). The operating mechanism (2) is linked to at least one of the first linkage shafts.

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