Neutral pole structure of a small circuit breaker

Abstract

The invention discloses a neutral pole structure of a small circuit breaker, including a housing, a switch-on and switch-off drive module, a circuit board, a connecting rod mechanism and a circuit breaker handle, wherein the switch-on and switch-off drive module includes: a motor group, a drive shaft is axially arranged, and the motor group is electrically connected to the circuit board; a transmission gear assembly is connected to the drive shaft; a gap space is arranged between the drive shaft and the transmission gear assembly, and the transmission gear assembly is connected to the circuit breaker handle; and a quick release module is also included, and the quick release module includes: an electromagnet is arranged at the side end of the motor group and is electrically connected to the circuit board; a push rod, the head end of which is axially connected to the electromagnet, the middle part is arranged in the gap space, and the end is contact-connected with the transmission gear assembly or contact-connected with the connecting rod mechanism. The invention combines the switch-on and switch-off drive module and the quick release function module into the neutral pole, realizes the structural layout in a small space, and has the quick release function required for leakage protection in addition to the switch-on and switch-off control.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, in particular to a neutral pole structure of a small circuit breaker. Background Art

[0002] Miniature circuit breaker, referred to as MCB, is the most widely used terminal protection device in the electrical terminal distribution device. MCB generally adopts modular design, and its appearance, size, wiring method, etc. are basically fixed. It is often installed on the last branch to protect and control the electrical equipment. With the development of the market and technology, the expansion of the functions of MCB has become a trend. The opening and closing drive module, that is, the electric operating mechanism (a functional module used to control the opening and closing of the MCB), is integrated into the neutral pole (or N pole for short) of the MCB. Without increasing the modulus of the MCB (the modulus refers to the thickness of the product as a multiple of 18mm, for example, 2 moduli refer to the thickness of the product is about 36mm), it can be used to replace the original ordinary miniature circuit breaker, so that the MCB not only has the original overcurrent protection function, but also has the opening and closing control function, etc., which has a great market demand.

[0003] The patent with document number CN206022261U discloses an electric operating mechanism for a circuit breaker. An electric operating mechanism is added to the N pole of the MCB to form a two-pole product with the L pole of the MCB. However, this product only has the functions of opening and closing control, overload and short-circuit protection. However, when rapid tripping is required, such as when leakage protection is activated, the standard requires that the circuit breaker trips and opens within 40 milliseconds at the fastest. Existing products of this type cannot meet the standard requirements if they use a motor acceleration and deceleration mechanism for tripping and opening.

[0004] The patent with document number CN108364837A discloses a novel automatic opening and closing control mechanism for a small circuit breaker and a circuit breaker. The leakage protection action drives the trip lever to hit the air switch tripper connecting rod through the electromagnet, so that the trip linkage shaft on the air switch tripper connecting rod drives the tripping connecting structure inside the circuit breaker to trip, thereby realizing automatic opening. However, in this scheme, another set of shells is added to the side of the MCB, and a motor and an electromagnet are arranged in the shell at the same time, instead of adding the above components to the N pole of the MCB, so that the module of the whole product is increased. In some renovation projects, due to the increase in the module of the small circuit breaker, the existing distribution box cannot be installed, and its application is subject to some restrictions. Summary of the invention

[0005] The object of the present invention is to provide a neutral pole structure of a small circuit breaker, which not only has a switch-on and switch-off drive module, but also has a fast tripping module, which can meet the fast tripping requirements when the leakage protection is actuated. To achieve the above object, the present invention adopts the following technical solutions:

[0006] A neutral pole structure of a small circuit breaker comprises a shell, an opening and closing drive module, a circuit board, a connecting rod mechanism and a circuit breaker handle installed in the shell, the opening and closing drive module and the connecting rod mechanism are connected to the circuit breaker handle, the connecting rod mechanism is linked to other poles of the small circuit breaker, the opening and closing drive module comprises: a motor group, a drive shaft is axially arranged on the motor group, and the motor group is electrically connected to the circuit board; a transmission gear assembly is connected to the drive shaft; a gap space is arranged between the drive shaft and the transmission gear assembly, and the transmission gear assembly is connected to the circuit breaker handle; and also comprises a quick release module, the quick release module comprises: an electromagnet is arranged at the side end of the motor group and is electrically connected to the circuit board; a push rod, a head end of which is axially connected to the electromagnet, a middle part is arranged in the gap space, and a terminal end is contact-connected with the transmission gear assembly or with the connecting rod mechanism.

[0007] In one embodiment, it further includes a transmission lever, the middle portion of which is hinged on the housing, one end of which is connected to the push rod, and the other end of which is in contact with the transmission gear assembly.

[0008] Furthermore, a connecting hole is provided at the connecting end of the transmission lever and the push rod, the electromagnet is arranged axially perpendicular to the drive shaft, the push rod is L-shaped, one end of the push rod is axially connected to the electromagnet, and the other end is inserted into the connecting hole.

[0009] Among them, the connecting rod mechanism includes a lock, a jumper, a tension spring and a U-shaped rod. A static contact assembly and a moving contact assembly electrically connected to the circuit board are arranged in the shell. The static contact assembly is installed on the shell. The lock, the jumper and the moving contact assembly are hinged on the shell. The side end of the moving contact assembly is connected to the shell through the tension spring. The lock is touched and rotated to unlock the jumper, and the jumper pops open. The tension spring opens the moving contact assembly. One end of the U-shaped rod is connected to the jumper, and the other end is connected to the circuit breaker handle.

[0010] Preferably, a transmission boss is provided below the circuit breaker handle, a through hole is provided in the middle of the transmission boss, one end of the U-shaped rod is inserted into the through hole to achieve connection with the circuit breaker handle, and a connecting boss is provided above the transmission gear assembly, and the connecting boss is contact-connected with the transmission boss.

[0011] In another embodiment, the end of the push rod is in contact connection with the lock catch.

[0012] Preferably, the transmission gear assembly includes a bevel gear, a face gear, a spur gear and a final spur gear, the bevel gear is axially connected to the drive shaft, the bevel gear is meshed with the face gear, the spur gear is coaxially arranged above the face gear, the final spur gear is meshed with the spur gear, a stopper is arranged below the final spur gear, and the end of the transmission lever is in contact with the stopper.

[0013] Wherein, the spur gear and the face gear are designed as an integral whole or are hinged together.

[0014] Furthermore, the circuit breaker handle comprises a connecting portion and a handle portion, the connecting portion is coaxially mounted on the final spur gear, a square shaft hole for coaxially connecting other pole circuit breaker handles is provided above the connecting portion, and the handle portion extends out of the housing.

[0015] Furthermore, a torsion spring for resetting is installed above the connecting portion of the circuit breaker handle; and a spring for pushing the push rod and the moving iron core to reset is installed in the electromagnet.

[0016] Preferably, the shell includes a bottom frame, a middle frame and an upper cover plate connected in sequence, the opening and closing drive module, the quick release module, the terminal group and the circuit breaker handle are installed between the bottom frame and the middle frame, and the circuit board is installed between the middle frame and the upper cover plate.

[0017] Preferably, a convex lower support platform is provided on both sides of the driving shaft at a position corresponding to the push rod on the bottom frame, and a lower arc-shaped cavity corresponding to the diameter of the push rod is provided on the upper surface of the lower support platform; a convex upper support platform is provided on the middle frame at a position corresponding to the push rod, and an upper arc-shaped cavity corresponding to the diameter of the push rod is provided on the lower surface of the upper support platform, and the push rod is arranged between the upper arc-shaped cavity and the lower arc-shaped cavity.

[0018] Preferably, a position sensor is provided on the circuit board, and a positioning block for touching the position sensor for position detection is provided on the connecting portion of the circuit breaker handle, the positioning block abuts against one pin of the torsion spring, and the other pin of the torsion spring abuts against the inner wall of the shell.

[0019] Preferably, it also includes a zero-sequence current transformer electrically connected to the circuit board, and the bottom frame, middle frame and upper cover are provided with notch holes for installing the zero-sequence current transformer.

[0020] Due to the adoption of the above structure, the present invention has the following beneficial effects: the present invention integrates the opening and closing drive module, the connecting rod mechanism and the quick release module into the neutral pole of the circuit breaker, and realizes the structural layout in a small space by installing the electromagnet and the push rod in a special position, that is, "setting the middle part of the push rod in the gap space between the motor and the transmission gear assembly", and the length and thickness of the product are similar to those of the existing products. The scheme of the present invention is combined with the L pole of the small circuit breaker, so that the module of the circuit breaker is the same as that of the existing product, and it not only has the opening and closing control function, but also has the quick release opening function. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a front view schematic diagram of the present invention.

[0023] Figure 3 yes Figure 2 Schematic diagram of the BB cross section.

[0024] Figure 4 It is a schematic diagram of the decomposition structure of the first embodiment of the present invention.

[0025] Figure 5 yes Figure 4 An enlarged schematic diagram of point A.

[0026] Figure 6 It is a schematic diagram of the connection structure of the opening and closing drive module, the fast release module and the circuit breaker handle in the first embodiment.

[0027] Figure 7 yes Figure 6 Schematic diagram of the decomposition.

[0028] Figure 8 It is a schematic diagram of the connection structure of the opening and closing drive module, the quick release module, the connecting rod mechanism and the circuit breaker handle in the first embodiment.

[0029] Fig. 9 yes Figure 8 Schematic diagram of the rear view from a certain angle.

[0030] Fig.10 It is a structural schematic diagram of the transmission lever.

[0031] Fig.11 It is a structural schematic diagram of an electromagnet driving a transmission lever to touch a final spur gear to control the rotation of a circuit breaker handle.

[0032] Fig.12 It is a schematic diagram of the connection between the circuit breaker handle and the U-shaped rod.

[0033] Fig.13It is a structural schematic diagram of the present invention with the upper cover plate removed.

[0034] Fig.14 It is a schematic diagram of the structure of the present invention with the upper cover plate, circuit board and middle frame removed.

[0035] Fig.15 It is a structural diagram of embodiment 2 of the present invention.

[0036] Description of main symbols:

[0037] 1: Shell, 11: Bottom frame, 111: Lower support platform, 112: Lower arc cavity, 113: Pin, 12: Middle frame, 121: Upper support platform, 122: Upper arc cavity, 13: Upper cover, 14: Notch hole, 2: Opening and closing drive module, 21: Motor group, 211: Drive shaft, 22: Transmission gear assembly, 221: Bevel gear, 222: Face gear, 223: Spur gear, 224: Final spur gear, 225: Connecting boss, 23: Clearance space, 24: Stopper, 3: Connecting rod mechanism, 31: jump button, 32: lock button, 33: U-shaped rod, 34: tension spring, 4: quick release module, 41: electromagnet, 42: push rod, 43: transmission lever, 431: hinge hole, 432: connecting hole, 51: static contact assembly, 52: moving contact assembly, 6: circuit breaker handle, 61: connecting part, 611: transmission boss, 612: through hole, 613: square shaft hole, 62: handle part, 63: positioning block, 7: circuit board, 8: position sensor, 9: torsion spring, 10: zero-sequence current transformer, 20: square shaft. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment 1

[0040] like Figure 1 to Figure 4 As shown, this embodiment discloses a neutral pole structure of a small circuit breaker, including a housing 1, a switch-on and switch-off drive module 2, a connecting rod mechanism 3, a quick release module 4, a circuit board 7, and a circuit breaker handle 6. A static contact assembly 51 and a moving contact assembly 52 are arranged in the housing, the switch-on and switch-off drive module 2 and the connecting rod mechanism 3 are connected to the circuit breaker handle 6, and the connecting rod mechanism 3 is linked to the other pole (L pole) of the small circuit breaker.

[0041] The housing 1 includes a bottom frame 11, a middle frame 12 and an upper cover 13 which are connected in sequence. The opening and closing drive module 2, the quick release module 4, the connecting rod mechanism 3, the static contact assembly 51, the moving contact assembly 52 and the circuit breaker handle 6 are installed between the bottom frame 11 and the middle frame 12, and the circuit board 7 is installed between the middle frame 12 and the upper cover 13. The bottom frame 11, the middle frame 12 and the upper cover 13 are also provided with a notch hole 14 for installing the zero-sequence current transformer 10. The zero-sequence current transformer 10 is installed in the notch hole 14 and connected to the circuit board 7 to detect the current in the circuit breaker.

[0042] like Figure 6 , 7 As shown, the opening and closing drive module 2 includes: a motor group 21 and a transmission gear assembly 22. The motor group 21 is axially provided with a drive shaft 211, and the motor group 21 includes a motor and a reduction mechanism. The motor group 21 is electrically connected to the circuit board 7. The transmission gear assembly 22 is connected to the drive shaft 211. In order to minimize the use space, the transmission gear assembly 22 of this embodiment includes: a bevel gear 221, a face gear 222, a spur gear 223 and a final spur gear 224. The bevel gear 221 is axially connected to the drive shaft 211, the bevel gear 221 is meshed with the face gear 222, the spur gear 223 is coaxially arranged above the face gear 222, the spur gear 223 and the face gear 222 are designed as an integral whole or are hinged as a whole, and the final spur gear 224 is meshed with the spur gear 223.

[0043] like Figure 7 As shown, a gap space 23 is provided between the driving shaft 211 and the bevel gear 221 .

[0044] The quick release module 4 includes an electromagnet 41, a push rod 42 and a transmission lever 43. The electromagnet 41 is arranged at the side end of the motor group 21, and the electromagnet 41 is electrically connected to the circuit board 7. The electromagnet 41 is arranged axially perpendicular to the drive shaft 211, and a spring (not shown in the figure) is installed in the electromagnet 41 to drive the push rod 42 and reset the moving iron core. The head end of the push rod 42 is axially connected to the electromagnet 41, the middle part of the push rod 42 is arranged in the gap space 23, and the end of the push rod 42 is connected to the transmission lever 43.

[0045] like Fig.10 As shown, a hinge hole 431 is provided in the middle of the transmission lever 43, and a pin 113 is provided on the bottom frame 11. The hinge hole 431 is installed in the pin 113 to realize the hinge connection of the transmission lever 43. A connection hole 432 is provided at the connection end of the transmission lever 43 and the push rod 42, and the other end of the transmission lever 43 is contact-connected with the final spur gear 224 of the transmission gear assembly 22. The push rod 42 is L-shaped, and one end of the push rod 42 is axially connected to the electromagnet 41, and the other end is inserted into the connection hole 432 to realize the connection with the transmission lever 43. Fig. 9As shown, a stopper 24 is provided below the final spur gear 224 , and the end of the transmission lever 43 contacts the stopper 24 .

[0046] like Figure 3 , Figure 5 As shown, at the position corresponding to the push rod 42 on the bottom frame 11, two groups of upwardly convex lower support platforms 111 are arranged on both sides of the driving shaft 211, and the upper surfaces of the lower support platforms 111 are provided with lower arc-shaped cavities 112 corresponding to the diameter of the push rod; at the position corresponding to the push rod 42 on the middle frame 12, a downwardly convex upper support platform 121 is arranged, and the lower surface of the upper support platform 121 is provided with an upper arc-shaped cavity 122 corresponding to the diameter of the push rod 42, and the push rod 42 is arranged between the upper arc-shaped cavity 122 and the lower arc-shaped cavity 112.

[0047] like Figure 7 As shown, the circuit breaker handle 6 includes a connecting portion 61 and a handle portion 62. The connecting portion 61 is coaxially mounted on the final spur gear 224 and driven to rotate by the final spur gear 224. The handle portion 62 extends out of the housing. A torsion spring 9 is installed below the connecting portion 61 of the circuit breaker handle 6 to facilitate elastic reset of the circuit breaker handle 6. Fig.12 As shown, a transmission boss 611 is provided below the connection portion 61 of the circuit breaker handle, and a through hole 612 is provided on the transmission boss 611, and the through hole 612 is provided for the U-shaped rod 33 of the connecting rod mechanism 3 to be inserted and connected. A connection boss 225 is provided above the final spur gear 224, and the connection boss 225 is contact-connected with the transmission boss 611. A square shaft hole 613 is provided above the connection portion 61 of the circuit breaker handle 6 for connecting the other pole circuit breaker handles. Figure 1 As shown, one end of a square shaft 20 is inserted into the square shaft hole 613, and the other end is connected to the L-pole circuit breaker handle to realize the linkage of the two poles. In other embodiments, the circuit breaker handle 6 of the present invention may also only include the connecting portion 61, and the circuit breaker handles of other poles are provided with a handle portion, and the circuit breaker handles of other poles drive the circuit breaker handle 6 of the present invention to be linked.

[0048] like Fig.13 As shown, a plurality of position sensors 8 are arranged on the circuit board 7, and a positioning block 63 for touching the position sensor 8 for position detection is arranged on the connection portion 61 of the circuit breaker handle 6. When the circuit breaker handle 6 is actuated, the positioning block 63 rotates to a position where it touches different position sensors 8, and the position sensor 8 converts the position information of the circuit breaker handle 6 into an electrical signal. One pin of the torsion spring 9 abuts against the positioning block 63, and the other pin abuts against the inner wall of the housing to achieve elastic reset.

[0049] like Fig.14 , Figure 8 , Fig. 9As shown in the figure, the connecting rod mechanism 3 includes a lock catch 32, a trip catch 31, a U-shaped rod 33 and a tension spring 34. The contact assembly includes a static contact assembly 51 and a moving contact assembly 52 electrically connected to the circuit board 7. The static contact assembly 51 is a bent terminal, and the moving contact assembly 52 is connected to the circuit board 7 through a soft connection 53. The static contact assembly 51 is installed on the housing, and the lock catch 32, the trip catch 31 and the moving contact assembly 52 are hinged on the bottom frame 11. The side end of the moving contact assembly 52 is connected to the side wall of the housing 1 through a tension spring 34. The lock catch 32 is touched and rotated to unlock the trip catch 31, and the trip catch 31 pops open. Under the action of the tension spring, the moving contact assembly 52 opens. One end of the U-shaped rod 33 is connected to the trip catch 31, and the other end is connected to the connecting hole of the circuit breaker handle 6.

[0050] The operating principle of this embodiment is described in detail as follows.

[0051] 1. The motor rotates forward or reversely, thereby driving the transmission gear assembly 22 to rotate, and the final spur gear 224 rotates clockwise or counterclockwise, thereby driving the circuit breaker handle 6 to rotate to close or open the circuit breaker.

[0052] 2. When overloaded or short-circuited, the lock 32 rotates to unlock the moving contact assembly 52 of the circuit breaker and open the circuit breaker.

[0053] 3. If Fig.11 As shown, when leakage occurs, the zero-sequence current transformer senses the current abnormality and transmits the signal to the circuit board. The circuit board 7 receives the signal of the leakage state, energizes the electromagnet 41, and the electromagnet 41 drives the push rod 42. The push rod 42 drives the transmission lever 43 to rotate so that the end of the transmission lever 43 touches the final spur gear 224, thereby realizing rapid automatic opening.

[0054] Embodiment 2

[0055] like Fig.15 As shown, the difference between this embodiment and the first embodiment is that the quick release module 4 includes an electromagnet 41 and a push rod 42. The head end of the push rod 42 is axially connected to the electromagnet 41, the middle part of the push rod 42 is arranged in the gap space 23, and the end of the push rod 42 is contact-connected with the lock 32 of the connecting rod mechanism 3.

[0056] The operating principle of this embodiment is described in detail as follows.

[0057] 1. The motor rotates forward or reversely, thereby driving the transmission gear assembly 22 to rotate, and the final spur gear 224 rotates clockwise or counterclockwise, thereby driving the circuit breaker handle 6 to rotate to close or open the circuit breaker.

[0058] 2. When overloaded or short-circuited, the lock 32 rotates to unlock the moving contact assembly 52 of the circuit breaker and open the circuit breaker.

[0059] 3. When the leakage protection is activated, the circuit board 7 detects the leakage state (which can be detected by the zero-sequence current transformer 10 or other methods such as manganese copper sampling resistor), energizes the electromagnet 41, and the electromagnet 41 drives the push rod 42, and the push rod 42 drives the lock 32 to rotate, so that the circuit breaker is opened.

[0060] In summary, the present invention and the L pole of the MCB form a two-pole product, which, in addition to the on-off control, also has the fast tripping function required for leakage protection, is highly practical, and is suitable for popularization and application.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A neutral pole structure of a small circuit breaker, comprising a housing, a switch-on / off drive module, a circuit board, a connecting rod mechanism and a circuit breaker handle installed in the housing, wherein the switch-on / off drive module and the connecting rod mechanism are connected to the circuit breaker handle, and the connecting rod mechanism is linked to other poles of the small circuit breaker, characterized in that: The opening and closing drive module comprises: A motor group, wherein a driving shaft is axially arranged on the motor group, and the motor group is electrically connected to the circuit board; A transmission gear assembly is connected to the drive shaft; a gap space is provided between the drive shaft and the transmission gear assembly, and the transmission gear assembly is connected to the circuit breaker handle; It also includes a quick release module, the quick release module includes: The electromagnet is arranged at the side end of the motor group and is electrically connected to the circuit board; The push rod has a head end axially connected to the electromagnet, a middle part arranged in the gap space, and a terminal end contact-connected with the transmission gear assembly or with the connecting rod mechanism.

2. The neutral pole structure of the miniature circuit breaker according to claim 1, characterized in that: It also includes a transmission lever, the middle part of which is hinged on the shell, one end of which is connected to the push rod, and the other end of which is in contact with the transmission gear assembly.

3. The neutral pole structure of the miniature circuit breaker according to claim 2, characterized in that: The connecting end of the transmission lever and the push rod is provided with a connecting hole, the electromagnet is arranged axially perpendicular to the driving shaft, the push rod is L-shaped, one end of the push rod is axially connected to the electromagnet, and the other end is inserted into the connecting hole.

4. The neutral pole structure of the miniature circuit breaker according to claim 1, characterized in that: The connecting rod mechanism includes a lock buckle, a trip buckle, a tension spring and a U-shaped rod. A static contact assembly and a moving contact assembly electrically connected to the circuit board are arranged in the housing. The static contact assembly is installed on the housing. The lock buckle, the trip buckle and the moving contact assembly are hinged on the housing. The side end of the moving contact assembly is connected to the housing through the tension spring. One end of the U-shaped rod is connected to the trip buckle, and the other end is connected to the circuit breaker handle. The lock buckle is rotated by the touch to unlock the trip buckle, the trip buckle pops open, and the tension spring opens the moving contact assembly.

5. The neutral pole structure of the miniature circuit breaker according to claim 4, characterized in that: A transmission boss is arranged below the circuit breaker handle, a through hole is opened in the middle of the transmission boss, one end of the U-shaped rod is inserted into the through hole to realize the connection with the circuit breaker handle, and a connecting boss is arranged above the transmission gear assembly, and the connecting boss is contact-connected with the transmission boss.

6. The neutral pole structure of the miniature circuit breaker according to claim 4, characterized in that: The end of the push rod is in contact connection with the lock catch.

7. The neutral pole structure of the miniature circuit breaker according to claim 2, characterized in that: The transmission gear assembly includes a bevel gear, a face gear, a spur gear and a final spur gear. The bevel gear is axially connected to the drive shaft, the bevel gear is meshed with the face gear, the spur gear is coaxially arranged above the face gear, the final spur gear is meshed with the spur gear, a stopper is arranged below the final spur gear, and the end of the transmission lever is in contact with the stopper.

8. The neutral pole structure of the miniature circuit breaker according to claim 7, characterized in that: The spur gear and the face gear are designed as one piece or are hinged together.

9. The neutral pole structure of a miniature circuit breaker according to claim 7, characterized in that: The circuit breaker handle comprises a connecting portion and a handle portion, wherein the connecting portion is coaxially mounted on the final spur gear, a square shaft hole for coaxially connecting other circuit breaker handles is arranged above the connecting portion, and the handle portion extends out of the housing.

10. The neutral pole structure of the miniature circuit breaker according to claim 9, characterized in that: A torsion spring for resetting is installed above the connecting part of the circuit breaker handle; and a spring for pushing the push rod and the moving iron core to reset is installed in the electromagnet.

11. The neutral pole structure of a miniature circuit breaker according to any one of claims 1 to 10, characterized in that: The housing comprises a bottom frame, a middle frame and an upper cover which are connected in sequence; the opening and closing drive module, the quick release module, the terminal block group and the circuit breaker handle are installed between the bottom frame and the middle frame; and the circuit board is installed between the middle frame and the upper cover.

12. The neutral pole structure of a miniature circuit breaker according to claim 11, characterized in that: A convex lower support platform is provided on both sides of the driving shaft at a position corresponding to the push rod on the bottom frame, and a lower arc-shaped cavity corresponding to the diameter of the push rod is provided on the upper surface of the lower support platform; a convex upper support platform is provided on the middle frame at a position corresponding to the push rod, and an upper arc-shaped cavity corresponding to the diameter of the push rod is provided on the lower surface of the upper support platform, and the push rod is arranged between the upper arc-shaped cavity and the lower arc-shaped cavity.

13. The neutral pole structure of a miniature circuit breaker according to claim 11, characterized in that: A position sensor is arranged on the circuit board, and a positioning block for touching the position sensor for position detection is arranged on the connecting part of the circuit breaker handle. The positioning block abuts against one pin of the torsion spring, and the other pin of the torsion spring abuts against the inner wall of the shell.

14. The neutral pole structure of the miniature circuit breaker according to claim 11, characterized in that: It also includes a zero-sequence current transformer electrically connected to the circuit board. The bottom frame, the middle frame and the upper cover are provided with notch holes for installing the zero-sequence current transformer.

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