Circuit breaker

Abstract

A circuit breaker comprises a shell, an operating system, a control module and at least two contact units, the control module is electrically connected with an electromagnetic release, the electromagnetic release and the operating system are arranged in parallel and correspond to the upper portion of the contact unit, the contact unit comprises a contact system, an arc extinguishing system and a protection system, the contact system comprises a moving contact and a static contact, and the moving contact is electrically connected with the operating system. The protection system comprises a mutual inductor and a backup protection device, the control module is arranged between the operation system and the inner side wall of the shell, the mutual inductor and the backup protection device are located on the two adjacent sides of the arc extinguishing system, and the mutual inductor or the backup protection device is located in a space defined by the contact system, the arc extinguishing system and the operation system. Therefore, the internal structure is more compact, and the overall size of the circuit breaker is reduced. According to the utility model, the control module is located in the housing of the adjacent operating system, and the mutual inductor and the backup protection device are located at two adjacent sides of the arc extinguishing system, so that the internal structure is more compact, and the overall size of the circuit breaker is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage apparatus, concretely relates to a circuit breaker. BACKGROUND

[0002] Low voltage circuit breaker is a kind of switch electric appliance that can be connected and disconnected normal load current and overload current, and can also be connected and disconnected short circuit current.The existing low voltage apparatus gradually develops towards intelligent, modular and small size, and small size electronic intelligent circuit breaker will be the mainstream product in the future, generally, circuit breaker has overcurrent protection system, however, the existing product has the following defects: first, in electronic circuit breaker, overcurrent protection system includes control module, mutual inductor and electromagnetic release, when mutual inductor collects that there is fault current on main circuit, electromagnetic release drives circuit breaker to disconnect, in order to consider electromagnetic release and the connection of mutual inductor and control module, control module is usually stacked or set adjacent to mutual inductor, so that the length or thickness of circuit breaker is inevitably increased;Second, thermal magnetic circuit breaker, its volume is relatively small, but due to the overcurrent protection system adopts thermal double gold material to deform completely for current protection, the sensitivity is poor, and misoperation or inaction is prone to occur, which affects the use safety. SUMMARY

[0003] The utility model aims at overcoming at least one defect of prior art, and provides a circuit breaker.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] The utility model provides a circuit breaker, including shell, operation system, control module and at least two parallel contact units are arranged in the shell, the control module is electrically connected with electromagnetic release, and the electromagnetic release is arranged in parallel with operation system and corresponds to the top of contact unit, the contact unit includes contact system, arc extinguishing system and protection system, and the contact system includes movable contact and static contact, the protection system includes mutual inductor and backup protection device, the control module is adjacent to operation system, and the control module is arranged between operation system and the inner side wall of shell, the mutual inductor and backup protection device are located on the adjacent two sides of arc extinguishing system, and the mutual inductor or backup protection device is located in the space enclosed by contact system, arc extinguishing system and operation system.

[0006] Preferably, the control module includes a circuit board, and the circuit board is arranged around the operation system and the shell.

[0007] Preferably, the circuit board is in U-shaped structure, and the operation system passes through the hollow area of the circuit board.

[0008] Preferably, the control module is arranged side by side with the operating system on one side, and the control module and the electromagnetic release are arranged on two sides adjacent to the operating system, and the control module comprises a circuit board.

[0009] Preferably, the shell is provided with a handle hole, and a handle connected to the operating system extends out of the handle hole, and at least part of the circuit board is parallel to the plane of the shell provided with the handle hole.

[0010] Preferably, the control module comprises a shell, the circuit board is arranged in the shell, the shell is provided with a display window and / or an operation window, the circuit board is provided with a display screen and / or a key, and the display screen and the key correspond to the display window and the operation window, respectively.

[0011] Preferably, in a first direction, the contact system, the backup protection device, and the reclosing device of the operating system are arranged in sequence, the backup protection device is used to drive the reclosing device to trip the circuit breaker, the mutual inductor and the arc extinguishing system are arranged side by side, and the mutual inductor is located on the side of the arc extinguishing system facing away from the contact system; in a second direction, the operating system, the backup protection device, and the arc extinguishing system are arranged in sequence; the electromagnetic release and the operating system are arranged side by side in a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0012] Preferably, the backup protection device is arranged along the first direction, the backup protection device comprises a magnetic yoke and a coil assembly, the magnetic yoke surrounds the outside of the coil assembly, one end of the coil assembly is provided with a static iron core, a dynamic iron core is slidingly arranged in the middle part of the coil assembly, one end of the dynamic iron core is spaced apart from the static iron core and is provided with a reset member, and the other end of the dynamic iron core cooperates with the reclosing device to trigger the operating system to trip.

[0013] Preferably, in a first direction, the contact system, the mutual inductor, and the reclosing device of the operating system are arranged in sequence, the backup protection device and the arc extinguishing system are arranged side by side, in a second direction, the operating system, the mutual inductor, and the arc extinguishing system are arranged in sequence, and the central axis of the mutual inductor is parallel to the second direction, the control module spans at least two contact units in a third direction, the electromagnetic release and the operating system are arranged side by side in the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0014] Preferably, the backup protection device is arranged along the second direction, the backup protection device comprises a magnetic yoke and an armature spaced apart in the second direction, a conductive plate passes between the magnetic yoke and the armature, a reset member is connected between the armature and the magnetic yoke, a push rod connected to the armature moves along the second direction, and the reclosing device is located on the movement track of the push rod.

[0015] Preferably, the push rod has a hollow region, so that the push rod has a frame structure, and the armature and the yoke are arranged in the hollow region in a spaced-apart manner.

[0016] Preferably, the arc extinguishing system comprises two arc extinguishing chambers arranged side by side, the contact system comprises a movable contact and a fixed contact, the movable contact comprises two movable contact portions arranged side by side, the fixed contact comprises two fixed contact portions, and each fixed contact portion is arranged at the arc inlet of one arc extinguishing chamber in a corresponding and matched manner with one movable contact portion.

[0017] Preferably, the arc extinguishing system further comprises a partition, the partition comprises a partition plate and a terminal slot, the two arc extinguishing chambers of one contact unit are separated by the partition plate, a first mounting slot is arranged between the partition plate and the terminal slot, a second mounting slot is arranged at one side edge of the partition plate, and the first mounting slot is adjacent to the second mounting slot.

[0018] Preferably, the partition further comprises a third mounting slot, the third mounting slot is arranged side by side with the second mounting slot and located at a side away from the first mounting slot, the third mounting slot is separated into two contact cavities by the partition plate, the bottom of each contact cavity is in communication with the plate surface of the partition plate, and each movable contact portion is matched with one fixed contact portion in one contact cavity.

[0019] Preferably, the shell is provided with a button hole, a trip button is arranged in the button hole, the trip button is arranged side by side with the operating system, and one end of the trip button in the shell is connected with the reclosing linkage for triggering the operating system to trip.

[0020] Preferably, three contact units are arranged side by side in the shell, the operating system is located above the contact unit at the middle position, and the electromagnetic trip unit, the operating system and the trip button are arranged side by side in sequence.

[0021] The circuit breaker of the utility model has the control module arranged in the shell of the adjacent operating system, fully utilizes the space near the operating system, and has the mutual inductor and the backup protection device arranged on the two sides of the arc extinguishing system, one of which is arranged in the space enclosed by the reclosing, the contact system and the arc extinguishing system, so that the internal structure is more compact and the overall size of the circuit breaker is reduced.

[0022] In addition, the circuit board in the control module is arranged in a manner of surrounding the operating system, or the control module is arranged side by side with the operating system, so that the space near the operating system is fully utilized, the space utilization rate is improved, and the size of the circuit breaker is reduced.

[0023] In particular, part of the circuit board is parallel to the plane of the shell provided with the handle hole, so that the display screen, the key and the like can be arranged on the circuit board.

[0024] In addition, by replacing the assembly positions of the mutual inductor and the backup protection device, and cooperating with the structure of the backup protection device, the inside of the circuit breaker is more compact, and the volume is reduced.

[0025] In addition, two arc extinguishing chambers are arranged in the arc extinguishing system, so that the arc extinguishing effect is improved, and in particular, a partition is arranged in the arc extinguishing system, which can separate the two arc extinguishing chambers and provide assembly positions for the mutual inductor and the backup protection device, so that the modular structure is realized, and assembly is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the circuit breaker of the utility model;

[0027] Figure 2 is a structural schematic diagram of the operating system and the moving contact of the utility model;

[0028] Figure 3 is a structural schematic diagram of the rotating shaft and the moving contact of the utility model;

[0029] Figure 4 is a structural schematic diagram of the moving contact of the utility model;

[0030] Figure 5 is a structural schematic diagram of the inside of the first embodiment of the utility model Figure 1 ;

[0031] Figure 6 is a structural schematic diagram of the inside of the first embodiment of the utility model Figure 2 ;

[0032] Figure 7 is a structural schematic diagram of the mutual inductor, the backup protection device and the conductive plate of the first embodiment of the utility model;

[0033] Figure 8 is a structural schematic diagram of the mutual inductor, the backup protection device and the arc extinguishing chamber of the first embodiment of the utility model;

[0034] Figure 9 is a structural schematic diagram of the partition of the first embodiment of the utility model;

[0035] Figure 10 is a front view of the partition of the first embodiment of the utility model;

[0036] Figure 11 is a structural schematic diagram of the inside of the second embodiment of the utility model Figure 1 ;

[0037] Figure 12 is a structural schematic diagram of the inside of the second embodiment of the utility model Figure 2 ;

[0038] Figure 13 is the exploded schematic view of the control module in the second embodiment of the utility model;

[0039] Figure 14 is the structural schematic view of the mutual inductor, backup protection device and conductive plate in the second embodiment of the utility model;

[0040] Figure 15 is the structural schematic view of the mutual inductor, backup protection device and arc extinguishing chamber in the second embodiment of the utility model;

[0041] Figure 16 is the structural schematic view of the backup protection device in the second embodiment of the utility model;

[0042] Figure 17 is the structural schematic view of the backup protection device in the second embodiment of the utility model (including the cross section of the conductive plate);

[0043] Figure 18 is the structural schematic view of the partition in the second embodiment of the utility model;

[0044] Figure 19 is the front view of the partition in the second embodiment of the utility model;

[0045] The reference signs in the drawings include:

[0046] 1 - shell, 101 - cover, 102 - base, 11 - partition, 111 - partition plate, 112 - terminal slot, 113 - first installation slot, 114 - second installation slot, 115 - third installation slot, 2 - operation system, 20 - handle, 21 - re-buckle, 3 - control module, 31 - circuit board, 311 - first circuit board, 312 - second circuit board, 32 - shell, 40 - rotating shaft, 41 - moving contact, 411 - moving contact part, 42 - static contact, 421 - static contact part, 5 - arc extinguishing system, 50 - arc extinguishing chamber, 51 - arc separation assembly, 52 - arc striking plate, 61 - electromagnetic release, 62 - mutual inductor, 63 - backup protection device, 631 - magnetic yoke, 632 - armature, 633 - push rod, 634 - reset piece, 630 - conductive plate, 7 - terminal, 8 - release button. DETAILED DESCRIPTION

[0047] The following embodiments are further illustrated in combination with the drawings, and the protection scope of the utility model is not limited to the description of the following embodiments.

[0048] As Figures 1-5As shown, the circuit breaker comprises a housing 1, an operating system 2, a control module 3 and at least two parallel contact units arranged in the housing 1, the housing 1 is provided with a handle hole, a handle 20 of the operating system 2 extends out of the handle hole for manually operating the operating system 2, the operating system 2 generally comprises a rotatingly assembled trip, a lock catch and a re-catch 21, wherein the trip is snap-fitted with the lock catch, and the re-catch 21 is limitingly fitted with the lock catch; the control module 3 comprises a circuit board 31 provided with a controller, which is generally a microprocessor or a special chip or a control circuit, and the circuit board 31 is further electrically connected with an electromagnetic release 61, the electromagnetic release 61 is driven to act by a control signal output by the controller, the re-catch 21 is triggered to rotate by the electromagnetic release 61, so that the re-catch 21 is unlocked with the lock catch, and the lock catch is disengaged from the snap-fitting with the trip. Each contact unit comprises a pair of connecting terminals 7, a contact system, an arc extinguishing system 5 and a protection system, the contact system comprises a moving contact 41 and a stationary contact 42, the contact system is connected between the pair of connecting terminals 7, and the operating system 2 drives the contact system to open and close, so as to turn on or turn off the main line of each contact unit, and the arc extinguishing system 5 cooperates to extinguish the arc generated by the contact system.

[0049] Further, each contact unit further comprises a protection system, the protection system comprises a mutual inductor 62, a backup protection device 63 and the electromagnetic release 61 electrically connected to the circuit board 31, generally, all contact units share one electromagnetic release 61, the electromagnetic release 61 is arranged parallel to the operating system 2, and the electromagnetic release 61 and the operating system 2 correspond to the upper sides of the two connecting units respectively, the electromagnetic release 61 cooperates with the re-catch 21 of the operating system 2, the mutual inductor 62 is coupled to the main line of each contact unit, when the mutual inductor 62 collects the fault current of the main line and feeds back to the control module 3, the control module 3 outputs a control signal to drive the electromagnetic release 61 to act and trigger the re-catch 21 to rotate, so that the operating system 2 is tripped, thereby breaking the main line of the contact unit and realizing overcurrent protection; the backup protection device 63 cooperates with the re-catch 21 of the operating system 2, when a larger short-circuit current appears in the main line, the backup protection device 63 triggers the re-catch 21 of the operating system 2 to trip the operating system 2 and cut off the power.

[0050] The improvement of the present application is that the control module 3 is adjacent to the operating system 2, and the control module 3 is arranged between the operating system 2 and the inner side wall of the housing 1, the mutual inductor 62 and the backup device are located on the adjacent two sides of the arc extinguishing system 5, and the mutual inductor 62 or the backup protection device 63 is located in the space enclosed by the contact system, the arc extinguishing system 5 and the re-catch 21 of the operating system 2.

[0051] Thus, the control module 3 is located inside the shell 1 adjacent to the operating system 2, making full use of the space near the operating system 2, and the mutual inductor 62 and the backup protection device 63 are located on two sides adjacent to the arc extinguishing system 5, one of which is located in the space enclosed by the reclosing device 21, the contact system and the arc extinguishing system 5, so that the internal structure is more compact, and the overall size of the circuit breaker is reduced.

[0052] Further, the circuit board 31 in the control module 3 is arranged around the operating system 2 and the shell 1, at this time, the surface of the circuit board 31 is parallel to the surface of the shell 1 provided with the handle hole, and the handle 20 of the operating system 2 extends out of the shell 1 through the circuit board 31; or, the control module 3 is arranged side by side with the operating system 2, the control module 3 and the electromagnetic release 61 are located on two sides adjacent to the operating system 2, preferably, at least part of the circuit board 31 is parallel to the surface of the shell 1 provided with the handle hole, and the control module 3 (circuit board 31) makes full use of the internal space of the shell 1 near the operating system 2, improves the space utilization, and is beneficial to reduce the size of the circuit breaker. In addition, the circuit board 31 is parallel to the surface of the shell 1 provided with the handle hole, which is convenient for arranging a display screen, a key and the like on the circuit board 31, and an operating window or a flip cover can be arranged at the shell 1 corresponding to the display screen and the key, which is convenient for operating the control module 3.

[0053] For the convenience of description, the direction of the wire connecting between a pair of connecting terminals 7 in each contact unit is the first direction, that is, the length direction of the circuit breaker is the first direction, the two directions perpendicular to the first direction are the second direction and the third direction, the height direction of the circuit breaker is the second direction, the operating system 2 is located above the contact system in the second direction, and the operating system 2 and the electromagnetic release 61 are arranged side by side in the third direction, and the two adjacent contact units are also arranged side by side in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0054] In combination with Figures 1-10 A first embodiment of the circuit breaker is provided.

[0055] As shown in FIGS. Figure 1 , 5 and 6, the circuit breaker comprises a shell 1, and the shell 1 comprises a base 102 and a cover 101, wherein the cover 101 is covered on the base 102 along the second direction, and a handle hole is arranged in the middle part of the cover 101. In this embodiment, the cover 101 comprises a middle cover and a surface cover, the middle cover is a rectangular frame structure, the hollow part of the middle cover is divided into three spaces along the third direction, and the space located in the middle position is used as the handle hole. The surface cover is covered on the middle cover to cover the side of the middle cover away from the base 102, and a handle hole is arranged in the middle part of the surface cover and communicates with the matching space in the middle position of the middle cover.

[0056] The housing 1 is provided with an operating system 2, a control module 3 and three contact units, the three contact units are arranged in parallel in the third direction, in the second direction, the operating system 2 is above the contact unit in the middle position, the handle 20 of the operating system 2 extends out of the housing 1 from the handle hole, the control module 3 includes a circuit board 31, the plane of the circuit board 31 is parallel to the plane of the cover 101 provided with the handle hole, in this embodiment, the plane of the circuit board 31 is parallel to the plane of the cover, the circuit board 31 is in the form of a U-shaped plate, the hollow area of the circuit board 31 is for the operating system 2 to pass through, so that the circuit board 31 is arranged around the outside of the operating system 2, Figure 5 、 6 In this embodiment, the circuit board 31 is closer to the cover, so that the handle 20 of the operating system 2 corresponds to extend out of the housing 1 from the handle hole; the control module 3 is connected with an electromagnetic release 61, that is, the electromagnetic release 61 is electrically connected to the circuit board 31, and the electromagnetic release 61 is arranged in parallel with the operating system 2 in the third direction, so that the electromagnetic release 61 is above one of the contact units in the second direction. As other embodiments, the circuit board 31 can also be in the form of an L shape, and the plane of the L-shaped circuit board 31 is also parallel to the plane of the cover.

[0057] Further, the control module 3 can further include a shell 32, and the circuit board 31 is arranged in the shell 32, correspondingly, the shape of the shell 32 is preferably matched with the shape of the circuit board 31, that is, when the circuit board 31 is in the form of a U shape, the shell 32 is also preferably in the form of a U shape, and when the circuit board 31 is in the form of an L shape, the shell 32 is also in the form of an L shape, which can not only reduce the volume of the control module 3, but also be conducive to reducing the cost; when the circuit board 31 is provided with a display screen and / or a key, the shell 32 is correspondingly provided with a display window and / or a key, of course, the display window and the operating window can be combined into one window with a larger opening, preferably, the display screen, the key, the display window and the operating window all face the cover.

[0058] In this embodiment, the operating system 2 can adopt the prior art, such as Figure 2 、 5 and 6, the operating system 2 includes a pair of side plates arranged in parallel in the third direction, a rocker arm, a jump buckle and a lock buckle are rotatably arranged between the pair of side plates, one end of the rocker arm is connected with a connecting rod assembly, the connecting rod assembly drives a moving contact 41 in the contact unit, the other end of the rocker arm is provided with a handle 20, the handle 20 can extend out of the housing 1 from the handle hole, the jump buckle is drivingly connected with the connecting rod assembly, the jump buckle is in position-limiting cooperation with the lock buckle, one end of a retraction buckle 21 is in position-limiting cooperation with the lock buckle, and the other end of the retraction buckle 21 extends out of the side plate along the second direction.

[0059] As shown in Figure 5 、 6As shown, each contact unit comprises a pair of terminal 7, a contact system and an arc extinguishing system 5, wherein the pair of terminal 7 is oppositely arranged at two ends of the base 102 in the first direction, the contact system is arranged between the arc extinguishing system 5 and the operating system 2 in the second direction, the contact system comprises a moving contact 41 and a stationary contact 42, the moving contact 41 and the stationary contact 42 are oppositely arranged at an arc entrance of the arc extinguishing system 5 in the first direction, wherein the stationary contact 42 is fixed to an end of the arc extinguishing system 5 away from the reclosing device 21, the moving contact 41 is connected to the linkage assembly of the operating system 2, and the moving contact 41 is oppositely arranged with the reclosing device 21 in the first direction, so that the moving contact 41, the reclosing device 21 and the arc extinguishing system 5 form a containing space, such as Figures 3-6 As shown, the moving contact 41 is connected to the linkage assembly of the operating system 2 through the rotating shaft 40, and preferably, the rotating shaft 40 in all contact units is an integral structure, so as to ensure the synchronous opening and closing operation of the plurality of contact units, and the moving contact 41 is driven by the operating system 2 to move towards or away from the stationary contact 42 in the first direction.

[0060] As shown, Figures 5-8 As shown, each contact unit further comprises a protection system, the protection system comprises an electromagnetic release 61, a mutual inductor 62 and a backup protection device 63, in the embodiment, the three contact units share one electromagnetic release 61, the electromagnetic release 61 is arranged in parallel with the operating system 2 in the third direction, the electromagnetic release 61 is arranged above one contact unit in the second direction, the mutual inductor 62 and the backup protection device 63 are arranged on adjacent sides of the arc extinguishing system 5, in the embodiment, in the first direction, the contact system, the backup protection device 63 and the reclosing device 21 of the operating system 2 are arranged in sequence, that is, the backup protection device 63 is arranged in the containing space along the first direction, the reclosing device 21 is driven by the backup protection device 63, the mutual inductor 62 is arranged side by side with the arc extinguishing system 5, and the mutual inductor 62 is arranged on a side of the arc extinguishing system 5 away from the contact system, in the first direction, the mutual inductor 62 is arranged between one terminal 7 and the arc extinguishing system 5, and a central axis of the mutual inductor 62 is parallel to the first direction.

[0061] As shown, Figure 7As shown, each terminal 7 is connected with a conductive plate 630, the pair of terminals 7 includes an incoming terminal and an outgoing terminal, the transformer 62 is coupled to the main line of each contact unit, in this embodiment, the terminal 7 adjacent to the transformer 62 is the incoming terminal, the conductive plate 630 connected to the incoming terminal passes through the center hole of the transformer 62 and is connected with the backup protection device 63, the backup protection device 63 is electrically connected with the outgoing terminal through the contact system, wherein the backup protection device 63 is prior art, generally, the backup protection device 63 includes a magnetic yoke 631 and a coil assembly, wherein the magnetic yoke 631 is arranged around the outside of the coil assembly, the coil assembly includes a coil skeleton and a coil wound outside the coil skeleton, one end of the coil assembly is provided with a static core, a dynamic core is slidingly arranged at the middle part of the coil assembly, one end of the dynamic core is opposite to the static core and is provided with a reset member 634, the other end of the dynamic core cooperates with the re-catch 21, when the coil is powered, the dynamic core is driven by the coil to move in the first direction to trigger the re-catch 21, so that the operating system 2 is tripped.

[0062] Further, the arc extinguishing system 5 of this embodiment includes two arc extinguishing chambers 50 arranged side by side in the third direction, each arc extinguishing chamber 50 can adopt prior art, generally, a plurality of arc extinguishing vanes for cutting arc are arranged in each arc extinguishing chamber 50, a pair of arc separation assemblies 51 are arranged at the arc inlet of each arc extinguishing chamber 50, the arc separation assemblies 51 corresponding to the same arc inlet are arranged at intervals in the third direction, the arc separation assembly 51 includes an arc separation plate, a gas generating member and a magnetic conducting member, etc., the structure of each arc extinguishing chamber 50 can adopt prior art.

[0063] Preferably, the moving contact 41 and the static contact 42 in the contact system are also improved correspondingly, wherein one end of the moving contact 41 is connected to the rotating shaft 40, the other end of the moving contact 41 is provided with two moving contact portions 411 arranged side by side in the third direction, so that the moving contact 41 as a whole presents a U-shaped body, each moving contact portion 411 is provided with a moving contact point, the static contact 42 also includes two static contact portions, each static contact portion is arranged at the arc inlet of one arc extinguishing chamber 50, the static contact portion is provided with a static contact point matched with the moving contact point, one static contact portion is electrically connected with the outgoing terminal, and the other static contact portion is electrically connected with the incoming terminal, that is, each static contact portion is also connected with an arc guiding plate 52, each arc guiding plate 52 respectively extends into one arc extinguishing chamber 50, in this embodiment, the backup protection device 63 is connected with two strip-shaped conductive plates 630 away from the transformer 62, the two strip-shaped conductive plates 630 are arranged side by side in the third direction, each strip-shaped conductive plate 630 is provided with one static contact point, thereby forming two static contact portions, one of the strip-shaped conductive plates 630 is formed by the part of the conductive plate 630 connected to the outgoing terminal, the moving contact 41 and the static contact 42 are matched through the two moving contact portions 411 and the two static contact portions, thereby increasing the current carrying capacity of the contact system and improving the safety in use.

[0064] Further, as shown in Figure 5 , 6 , 9 and 10, the arc extinguishing system 5 further comprises a partition 11, the partition 11 comprises a partition plate 111 and a terminal slot 112, the partition plate 111 is a plate structure, two arc extinguishing chambers 50 of the same contact unit are separated by the partition plate 111, the terminal slot 112 is used for assembling a terminal 7, in the embodiment, a line-in terminal is assembled in the terminal slot 112, a first mounting slot 113 is arranged between the terminal slot 112 and the partition plate 111, the transformer 62 is arranged in the first mounting slot 113, a second mounting slot 114 is arranged at one side edge of the partition plate 111, the first mounting slot 113 is adjacent to the second mounting slot 114, when the partition plate 111 is arranged in the circuit breaker, the second mounting slot 114 corresponds to a space in the circuit breaker for assembling a backup protection device 63, two arc extinguishing chambers 50 in the arc extinguishing system 5 are separated by the partition 11, and assembly positions are provided for the terminal 7, the transformer 62, the backup protection device 63 and the like, so as to facilitate forming a modular arc extinguishing system 5.

[0065] Preferably, the partition 11 further comprises a third mounting slot 115, the third mounting slot 115 is arranged side by side with the second mounting slot 114 and is located on the side away from the first mounting slot 113, the third mounting slot 115 is separated into two contact cavities by the partition plate 111, the bottom of each contact cavity is in communication with the plate surface of the partition plate 111, that is, each contact cavity is in communication with the arc inlet of one arc extinguishing chamber 50, respectively, one stationary contact part is arranged in each contact cavity, and two movable contact parts 411 of the movable contact 41 are located in the third mounting slot 115, so that each movable contact part 411 cooperates with one stationary contact part in one contact cavity.

[0066] In addition, as shown in Figure 6 , a trip button 8 can also be arranged in the housing 1, a button hole is arranged on the cover body 101, the trip button 8 is arranged in the button hole and slides in the second direction, one end of the trip button 8 located in the housing 1 is connected with the reset button 21 in linkage, the trip button 8 is further connected with a reset spring for resetting the trip button 8, the trip button 8 is pressed to trigger the reset button 21 to rotate, so that the operating system 2 is tripped, in the embodiment, the electromagnetic trip unit 61, the operating system 2 and the trip button 8 are arranged side by side in sequence, that is, in the second direction, the trip button 8 is located above the other contact unit.

[0067] A second embodiment of the circuit breaker is provided in combination with Figures 1-4 , 11-19.

[0068] As shown in Figures 1-4As shown, the circuit breaker comprises a housing 1, the housing 1 comprises a base 102 and a cover 101, the cover 101 is closed on the base 102 along the second direction, a handle hole is arranged in the middle of the cover 101, in the embodiment, the cover 101 comprises a middle cover and a surface cover, the middle cover is a rectangular frame structure, the surface cover is closed on the side of the middle cover away from the base 102, the middle of the surface cover is provided with a handle hole communicating with the middle cover, a flip cover is arranged on one side of the handle hole, and the flip cover is located on one side of the handle hole in the third direction.

[0069] As shown in Figure 11 , 12 , an operating system 2, a control module 3 and three contact units are arranged in the housing 1, the three contact units are arranged side by side in the third direction, the operating system 2 is located above the contact unit in the middle position in the second direction, the handle 20 of the operating system 2 extends out of the housing 1 from the handle hole, the control module 3 is arranged side by side with the operating system 2 in the first direction, the control module 3 and the operating system 2 are arranged above the contact system in the second direction, and the control module 3 spans the three contact systems in the third direction. Of course, the control module 3 can also span only two of the contact systems, or when the number of contact systems is larger, more contact systems can be spanned.

[0070] As shown in Figures 11-13 , the control module 3 comprises a shell 32, and a circuit board 31 is arranged in the shell 32, in the embodiment, two mutually perpendicular circuit boards 31 are arranged in the shell 32, for the convenience of description, the two circuit boards 31 are divided into a first circuit board 311 and a second circuit board 312, the plane where the first circuit board 311 is located is parallel to the plane where the surface cover is located, the shell 32 is provided with a display window and an operation window opposite to the first circuit board 311, the first circuit board 311 is provided with a display screen and a key, wherein the display screen and the key correspond to the display window and the operation window respectively, the display screen and the key can be observed by opening the flip cover, of course, the shell 32 can also be provided with only the display window or the operation window, and correspondingly, the first circuit board 311 can also be provided with only the display screen or the key; the second circuit board 312 extends along the second direction on one side of the contact system.

[0071] As shown in Figures 2-4, 11 and 12, in the embodiment, the operating system 2 adopts the same structure as the first embodiment; each contact unit comprises a pair of terminal posts 7, a contact system and an arc extinguishing system 5, wherein the pair of terminal posts 7, the contact system and the arc extinguishing system 5 have the same structure as the first embodiment, the pair of terminal posts 7 are spaced apart from each other in the first direction, in the second direction, the contact system is located between the arc extinguishing system 5 and the operating system 2, the movable contact 41 and the fixed contact 42 are arranged at the arc entrance of the arc extinguishing system 5 and spaced apart from each other in the first direction, wherein the fixed contact 42 is fixed to the end of the arc extinguishing system 5 away from the reclosing device 21, the movable contact 41 is connected to the connecting rod assembly of the operating system 2, and the movable contact 41 is spaced apart from the reclosing device 21 in the first direction, so that the movable contact 41, the reclosing device 21 and the arc extinguishing system 5 form a containing space.

[0072] As shown in Figure 11 , 12 and 14, the same as the first embodiment, each contact unit further comprises a protection system, the protection system comprises an electromagnetic release 61, a mutual inductor 62 and a backup protection device 63, in the embodiment, the electromagnetic release 61 is arranged in parallel with the operating system 2 in the third direction, the electromagnetic release 61 is located above one contact unit in the second direction, the mutual inductor 62 and the backup protection device 63 are arranged on the adjacent two sides of the arc extinguishing system 5, and the difference from the first embodiment is that, in the first direction, the contact system, the mutual inductor 62 and the reclosing device 21 of the operating system 2 are arranged in sequence, that is, the mutual inductor 62 is arranged in the containing space, and the central axis of the mutual inductor 62 is parallel to the second direction, the backup protection device 63 is arranged side by side with the arc extinguishing system 5, and the backup protection device 63 is located on the side of the arc extinguishing system 5 away from the contact system.

[0073] In the embodiment, the backup protection device 63 is arranged along the second direction, as shown in Figure 16 , 17 The backup protection device 63 comprises a magnetic yoke 631 and an armature 632 spaced apart from each other in the second direction, a conductive plate 630 passes between the magnetic yoke 631 and the armature 632, a reset member 634 is connected between the armature 632 and the magnetic yoke 631, a push rod 633 connected to the armature 632 moves along the second direction, and the reclosing device 21 is located on the movement track of the push rod 633, when the conductive plate 630 flows through a short-circuit current, a magnetic field is generated between the magnetic yoke 631 and the armature 632, the magnetic field drives the armature 632 to move towards the magnetic yoke 631, the movement of the armature 632 drives the push rod 633 to move along the second direction to trigger the reclosing device 21, so as to realize the tripping and power-off of the operating system 2.

[0074] As shown in Figure 17As shown, the push rod 633 is a rectangular frame structure with a hollow area in the middle. The armature 632 and the magnetic yoke 631 are arranged opposite each other in the hollow area. The reset piece 634 is also located in the frame, so that the backup protection device 63 forms a modular structure, which is convenient for assembly and occupies little space. Preferably, one end of the push rod 633 is provided with a protruding trigger part, which pushes the re-clamp 21 to disengage the operating system 2.

[0075] like Figure 15 , 18 As shown in Figure 19, in this embodiment, the arc extinguishing system 5 adopts the same structure as the first embodiment. The difference from the first embodiment is that in the separator 11 in this embodiment, the first mounting groove 113 is used to assemble the backup protection device 63, and the second mounting groove 114 is used to assemble the current transformer 62. Correspondingly, the contact system also adopts the same structure as the first embodiment.

[0076] In addition, such as Figure 12 As shown, a trip button 8 can also be configured inside the housing 1. A button hole is provided on the cover 101. The trip button 8 is slidably disposed in the button hole along the second direction. One end of the trip button 8 located inside the housing 1 is linked to the re-clamp 21. The trip button 8 is also connected to a reset spring for resetting the trip button 8. In this embodiment, the electromagnetic trip unit 61, the operating system 2 and the trip button 8 are arranged in parallel in sequence. That is, in the second direction, the trip button 8 is located above another contact unit.

[0077] 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.

[0078] 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 (1), wherein an operating system (2), a control module (3), and at least two parallel contact units are disposed within the housing (1), the control module (3) being electrically connected to an electromagnetic trip unit (61), the electromagnetic trip unit (61) being disposed parallel to the operating system (2) and corresponding to the upper part of the contact units, the contact units comprising a contact system, an arc extinguishing system (5), and a protection system, the contact system comprising a moving contact (41) and a stationary contact (42), the protection system comprising a current transformer (62) and a backup protection device (63), characterized in that: The control module (3) is adjacent to the operating system (2), and the control module (3) is located between the operating system (2) and the inner wall of the outer casing (1). The current transformer (62) and the backup protection device (63) are located on adjacent sides of the arc extinguishing system (5), and the current transformer (62) or the backup protection device (63) is located in the space enclosed by the contact system, the arc extinguishing system (5) and the re-clamp (21) of the operating system (2).

2. The circuit breaker according to claim 1, characterized in that: The control module (3) includes a circuit board (31) which is arranged around the operating system (2) and the outer casing (1).

3. The circuit breaker according to claim 2, characterized in that: The circuit board (31) has a U-shaped structure, and the operating system (2) passes through the hollow area of ​​the circuit board (31).

4. The circuit breaker according to claim 1, characterized in that: The control module (3) is arranged side by side on one side of the operating system (2), and the control module (3) and the electromagnetic trip unit (61) are located on the two adjacent sides of the operating system (2). The control module (3) includes a circuit board (31).

5. The circuit breaker according to any one of claims 2-4, characterized in that: The outer casing (1) is provided with a handle hole, and a handle (20) connected to the operating system (2) extends out from the handle hole. At least a portion of the circuit board (31) is parallel to the plane of the outer casing (1) where the handle hole is provided.

6. The circuit breaker according to claim 5, characterized in that: The control module includes a housing (32), and a circuit board (31) is disposed inside the housing (32). The housing (32) is provided with a display window and / or an operation window, and the circuit board (31) is provided with a display screen and / or buttons. The display screen and buttons correspond to the display window and the operation window, respectively.

7. The circuit breaker according to claim 1, characterized in that: In the first direction, the contact system, the backup protection device (63), and the re-clamping (21) of the operating system (2) are arranged in sequence. The backup protection device (63) is used to drive the re-clamping (21) to trip the circuit breaker. The current transformer (62) is arranged side by side with the arc extinguishing system (5), and the current transformer (62) is located on the side of the arc extinguishing system (5) facing away from the contact system. In the second direction, the operating system (2), the backup protection device (63), and the arc extinguishing system (5) are arranged in sequence. The electromagnetic trip unit (61) and the operating system (2) are arranged side by side in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

8. The circuit breaker according to claim 7, characterized in that: The backup protection device (63) is arranged along the first direction. The backup protection device (63) includes a magnetic yoke (631) and a coil assembly. The magnetic yoke (631) is arranged around the outside of the coil assembly. One end of the coil assembly is provided with a stationary iron core. A moving iron core is slidably arranged in the middle of the coil assembly. One end of the moving iron core is spaced apart from the stationary iron core and is provided with a reset member. The other end of the moving iron core cooperates with the re-clamp (21) to trigger the operating system (2) to trip.

9. The circuit breaker according to claim 1, characterized in that: In the first direction, the contact system, the current transformer (62), and the re-clamp (21) of the operating system (2) are arranged in sequence, and the backup protection device (63) and the arc extinguishing system (5) are arranged side by side. In the second direction, the operating system (2), the current transformer (62), and the arc extinguishing system (5) are arranged in sequence, and the central axis of the current transformer (62) is parallel to the second direction. The control module (3) spans at least two contact units in the third direction, and the electromagnetic trip unit (61) and the operating system (2) are arranged side by side in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

10. The circuit breaker according to claim 9, characterized in that: The backup protection device (63) is arranged along the second direction. The backup protection device (63) includes a magnetic yoke (631) and an armature (632) spaced apart and opposite each other in the second direction. A conductive plate (630) passes between the magnetic yoke (631) and the armature (632). A reset member (634) is connected between the armature (632) and the magnetic yoke (631). A push rod (633) connected to the armature (632) moves along the second direction. The re-clamp (21) is located on the moving trajectory of the push rod (633). The push rod (633) has a hollow area, making the push rod (633) a frame structure. The armature (632) and the magnetic yoke (631) are spaced apart and opposite each other in the hollow area.

11. The circuit breaker according to claim 1, characterized in that: The arc extinguishing system (5) includes two arc extinguishing chambers (50) arranged in parallel. The contact system includes a moving contact (41) and a stationary contact (42). The moving contact (41) includes two moving contact parts (411) arranged in parallel. The stationary contact (42) includes two stationary contact parts. Each stationary contact part cooperates with a moving contact part (411) and is correspondingly arranged at the arc inlet of an arc extinguishing chamber (50).

12. The circuit breaker according to claim 11, characterized in that: The arc extinguishing system (5) also includes a separator (11), which includes a separator plate (111) and a terminal slot (112). The separator plate (111) separates the two arc extinguishing chambers (50) of the same contact unit. A first mounting slot (113) is provided between the terminal slot (112) and the separator plate (111). A second mounting slot (114) is provided on one side edge of the separator plate (111). The first mounting slot (113) and the second mounting slot (114) are adjacent to each other. The separator (11) is also provided with a third mounting groove (115), which is arranged side by side with the second mounting groove (114) and located on the side away from the first mounting groove (113). The third mounting groove (115) is divided into two contact cavities by the separator plate (111). The bottom of each contact cavity is connected to the plate surface of the separator plate (111), so that each moving contact part (411) and a stationary contact part cooperate in one contact cavity.

13. The circuit breaker according to claim 1, characterized in that: The outer casing (1) is provided with a button hole, and a trip button (8) is provided in the button hole. The trip button (8) is arranged side by side with the operating system (2), and the end of the trip button (8) located inside the outer casing (1) is linked with the re-clamp (21) to trigger the trip of the operating system (2). The outer casing (1) is provided with three parallel contact units. The operating system (2) is located above the middle contact unit. The electromagnetic trip device (61), the operating system (2) and the trip button (8) are arranged side by side in sequence.

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