A circuit breaker with independent opening and closing for each pole

Abstract

The utility model relates to a circuit breaker of independent split of each pole, through three groups of operation unit and wiring unit along the width direction parallel layout in the shell inside, realize modularization design, this not only greatly facilitates production assembly process, reduces production cost and assembly difficulty, simultaneously, compact layout can make full use of the shell inside space, significantly reduce the overall volume of circuit breaker, make it realize more function in limited space, improve space utilization, each group of operation unit is equipped with independent arc extinguishing subassembly, phase wiring terminal piece extends to arc extinguishing subassembly and sets up static contact, arc can be introduced and be extinguished fast when generating, effectively prevent arc to cause damage to internal component, auxiliary push rod assembly and operating mechanism, handle assembly cooperate, ensure that contact point can reliably split, electromagnetic release component integrates and installs in operating mechanism, can accurate perception fault current and drive operating mechanism fast action when trouble, cut off circuit in time.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a circuit breaker that allows each pole to open and close independently. Background Technology

[0002] As a key device to ensure the safe operation of circuits, the reliability of circuit breakers directly affects the continuity of power supply. Traditional circuit breakers usually adopt a three-phase shared operating mechanism design. When a fault occurs in one phase, the entire circuit breaker will trip simultaneously, causing other normal phases to be forced to lose power as well. This design cannot meet the high reliability requirements in critical scenarios, because a single fault may lead to a large-scale power outage and cause serious losses. With the increasing requirements for power supply continuity, the market urgently needs a circuit breaker that can avoid the failure of the entire system due to a single fault. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a circuit breaker with highly integrated, highly reliable, fast response and convenient maintenance, which allows each pole to be independently opened and closed.

[0004] To achieve the above objectives, this utility model employs a circuit breaker with independent switching for each pole, comprising a housing. Inside the housing, three sets of operating units and a wiring unit are arranged side-by-side along the width direction. Each operating unit includes an arc-extinguishing assembly, an auxiliary push rod assembly, a handle assembly, an operating mechanism, and an electromagnetic trip unit assembly. The top of the arc-extinguishing assembly is provided with an auxiliary push rod assembly, and an operating mechanism is provided on one side. A handle assembly is mounted on the operating mechanism via a pin. An electromagnetic trip unit is mounted on the side of the operating mechanism away from the arc-extinguishing assembly. The wiring unit includes three sets of phase line terminal pieces and outgoing line terminal pieces corresponding to the three sets of operating units in position, and a set of common terminal pieces and common outgoing line terminal pieces for connecting the neutral line. Each set of phase line terminal pieces extends into the arc-extinguishing assembly of the corresponding operating unit and has a stationary contact at its end.

[0005] The advantages of the above structure are as follows: By adopting a circuit breaker structure with independent opening and closing for each pole, three sets of operating units and wiring units are arranged side by side along the width direction inside the housing to achieve modular design. This not only greatly facilitates the production and assembly process and reduces production costs and assembly difficulty, but also makes full use of the internal space of the housing, significantly reducing the overall size of the circuit breaker, enabling it to achieve more functions in a limited space and improving space utilization. Each operating unit is equipped with an independent arc extinguishing component, and the phase line wiring terminal extends into the arc extinguishing component and is equipped with a static contact. When an arc is generated, it can be quickly introduced and extinguished, effectively preventing the arc from damaging the internal components. The auxiliary push rod assembly works in conjunction with the operating mechanism and handle assembly to ensure reliable opening and closing of the contacts. The electromagnetic trip unit assembly is integrated into the operating mechanism, which can accurately sense the fault current and drive the operating mechanism to act quickly and cut off the circuit in time when a fault occurs.

[0006] This utility model is further configured such that the operating mechanism includes an operating bracket, and a jump catch is installed inside the operating bracket. An upper connecting rod is connected to the jump catch via a pin, and a lower connecting rod is hinged to the upper connecting rod via a hinge shaft. A rotating shaft is installed on the lower connecting rod through a shaft hole. A moving contact is provided inside the rotating shaft. One end of the moving contact is engaged inside the rotating shaft, and the other end extends into the arc extinguishing assembly to correspond to the stationary contact of the phase wire terminal piece, and a moving contact is provided at the end of the moving contact. A re-catch is provided at the end of the jump catch away from the arc extinguishing assembly, and a traction rod is connected to the re-catch. The traction rod is fixedly installed on the operating bracket via the re-catch. A locking shaft is provided between the re-catch and the jump catch. The locking shaft penetrates the wall of the operating bracket, and a locking buckle located inside the operating bracket is installed on the locking shaft. The operating bracket includes a front screw hole and a rear screw hole. The front screw hole is set vertically downward, and the rear screw hole is set inward. The operating mechanism forms a multi-link transmission system. A jump catch is installed within the operating bracket, connecting to an upper connecting rod via a pin. The upper connecting rod is then hinged to a lower connecting rod via a hinge shaft. The lower connecting rod is fitted with a rotating shaft through a shaft hole. A moving contact is installed within the rotating shaft. During operation, the force of the handle assembly is efficiently and precisely transmitted, ensuring smooth opening and closing of the moving contact and reducing the risk of mechanical failure. Simultaneously, one end of the moving contact is engaged within the rotating shaft, while the other end extends to the arc-extinguishing component, precisely corresponding to the stationary contact and setting the moving contact. This ensures that contact separation and moving contact rotation are synchronized, further improving switching performance and reducing arc generation. In addition, a re-clamp is set at the end of the trip stop away from the arc extinguishing component. The re-clamp is connected to the traction rod and fixed on the operating bracket. A locking shaft penetrating the wall is set between the re-clamp and the trip stop, and a locking buckle is installed on it to form a complete locking mechanism. During normal operation, it ensures the stability of the operating mechanism. In case of failure, the electromagnetic force of the electromagnetic trip device unlocks the locking buckle, and the operating mechanism quickly trips the circuit, cuts off the circuit in time, and protects the equipment line. The front screw hole on the operating bracket is changed to be set vertically downward, and the rear screw hole is changed to be set with an inward structure. This structural design makes the width of the mechanism narrower and the size more compact than similar products.

[0007] This utility model further comprises an electromagnetic trip unit assembly installed in the operating mechanism, including a magnetic yoke located below the latch and an armature bracket mounted on the yoke. An armature is mounted on the armature bracket, with one end of the armature mounted on the bracket and the other end extending through a bend to the space between the latch and the traction rod. A groove is provided on the traction rod, and a magnet is installed within the groove. By integrating the electromagnetic trip unit assembly into the operating mechanism, with one end of its armature extending between the latch and the traction rod, and a magnet installed within the groove of the traction rod, the rational layout ensures a clear and precise magnetic force path. In the event of a fault, the magnetic force can directly and effectively act on the latch mechanism, ensuring reliable tripping of the operating mechanism. This reduces operational errors caused by mechanical transmission problems or component misalignment, allowing the circuit breaker to disconnect the circuit in a very short time. This effectively prevents electrical equipment and lines from suffering severe damage due to prolonged exposure to fault current, greatly improving electrical safety.

[0008] This utility model is further configured with a housing including a base, a large cover on the base, and a middle cover on the large cover. A transparent cover is installed on the middle cover. A base plate is installed at the bottom of the base. The arc extinguishing component and the operating mechanism are installed inside the base. One end of the handle component is installed on the operating mechanism via a pin, and the other end extends to the outside of the middle cover via a handle groove in the large cover and an opening groove in the corresponding position of the middle cover. The large cover has a receiving groove for accommodating the auxiliary push rod component near the arc extinguishing component. The large cover has a placement groove for placing a magnet on the side of the traction rod away from the operating mechanism. The placement groove has an opening corresponding to the groove in the traction rod. One end of the magnet is engaged in the placement groove, and the other end is installed in the groove of the traction rod by interference fit. The large cover has a button groove on one side of the magnet. The button is installed in the button groove and is corresponding to the top side of the traction rod. The housing employs a layered design, with each component positioned clearly and compactly. The magnets are securely connected to the mounting slots of the cover and the grooves of the traction rod via snap-fit ​​and interference fit, ensuring the stability of the magnets during circuit breaker operation and preventing them from loosening or falling off due to vibration or external force. The buttons are installed in the button slot and correspond to the top side of the traction rod, ensuring accurate positioning and precise triggering of the traction rod during operation. This guarantees the reliability and stability of circuit breaker operation and reduces the risk of failure due to unstable component installation.

[0009] This utility model is further configured as follows: the auxiliary push rod assembly includes an auxiliary box installed in a receiving slot and an auxiliary transparent cover snapped onto the auxiliary box. The auxiliary box contains a micro switch and an auxiliary push rod is inserted into it via an interference fit. The auxiliary push rod extends out of the auxiliary box through a push rod slot and is correspondingly positioned to the handle assembly. The interference fit ensures the auxiliary push rod is stably fixed within the auxiliary box, preventing it from shaking or falling off. The auxiliary transparent cover snaps onto the auxiliary box, providing good protection against dust and debris entering the box, preventing contamination and damage to the auxiliary push rod, and extending the service life of the auxiliary push rod assembly. Simultaneously, the transparent material design allows the operator to easily observe the status of the auxiliary push rod within the auxiliary box. When the handle assembly is activated, pushing upwards to close the circuit breaker will cause the handle to press against the auxiliary push rod, allowing it to slide within the auxiliary box and trigger the micro switch. Pulling downwards to open the circuit breaker will cause the auxiliary push rod to pop out after the handle's pushing force is removed, thus providing feedback on the open / closed status of each pole of the switch.

[0010] This utility model is further configured to include a heating element installed within the base, on which a bimetallic strip is mounted. One end of the bimetallic strip is attached to the heating element, and the other end extends to the traction rod. When an overload occurs in the circuit, the heating element is highly sensitive to changes in current, rapidly deforming the bimetallic strip and pushing the traction rod to achieve quick tripping. Working in conjunction with the bimetallic strip, it accurately senses the overload current in real time and triggers the tripping action, ensuring the safety of electrical equipment and circuits.

[0011] This utility model is further configured such that the outgoing terminal assembly and the common outgoing terminal assembly are mounted on the base, and each includes four rectangularly arranged wiring frames and a connecting plate. The connecting plate is snapped into the corresponding four wiring frames. Each wiring frame has a threaded hole, and a wiring screw is inserted into each threaded hole, with the end of the wiring screw abutting against the connecting plate. The wiring screw is covered with a terminal cover installed inside a large cover. By mounting both the outgoing terminal assembly and the common outgoing terminal assembly on the base, and with the four wiring frames arranged in a rectangle, stable support and fixed position are provided for the wires. The connecting plate is snapped into the wiring frame, and the wiring screw passes through the threaded hole and abuts against the connecting plate. This multiple fixing method ensures a firm connection of the wires, reduces faults caused by poor contact, and lowers the maintenance frequency. The terminal cover on the wiring screw protects the connection part.

[0012] This utility model further specifies that both the phase line terminal block and the common terminal block are stationary contacts. Each stationary contact includes a terminal and a contact end. The contact end extends in an arc shape into the arc-extinguishing assembly of the corresponding operating unit and has a stationary contact point at its end. The arc-shaped extension of the contact end by the stationary contact increases the contact area with the moving contact. When the circuit breaker is closed, the moving contact and the stationary contact on the arc-shaped contact end can make more thorough and tight contact, effectively reducing contact resistance, minimizing heat generation due to poor contact, improving the efficiency and stability of circuit transmission, and preventing equipment damage and safety accidents caused by localized overheating.

[0013] This utility model is further configured with a base containing current transformers corresponding to the three sets of operating units in position, and a zero-sequence current transformer for connecting the current transformers. By installing the three sets of current transformers corresponding to the three sets of operating units within the base, the magnitude and changes of the current in each phase circuit can be monitored independently and accurately. After the zero-sequence current transformer is connected to the three sets of current transformers, it comprehensively detects the zero-sequence current in the three-phase circuit, promptly detects changes in the zero-sequence current, and transmits the signal to the leakage current protection device of the circuit breaker, causing the circuit breaker to quickly disconnect the circuit, preventing electric shock accidents and electrical fires caused by leakage current, and ensuring personal and equipment safety.

[0014] This utility model is further configured with a slot corresponding to the transparent cover in the middle cover. The slot houses a power module, a measurement unit module, and a three-phase carrier module, and also includes a battery slot containing a battery box. The slot in the middle cover, with its integrated power module, measurement unit module, and three-phase carrier module, allows for an orderly arrangement of functional modules, reducing wiring complexity and improving overall integration. The dedicated battery slot and battery box on the middle cover provide an independent and safe installation location for the battery. The battery box secures and protects the battery, preventing damage or poor contact due to shaking or collisions during product use, ensuring stable power supply, and improving the product's power supply reliability and stability. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0016] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present utility model.

[0017] Figure 3 This is an exploded view of the operating mechanism assembly according to an embodiment of the present invention.

[0018] Figure 4 This is a front view of the operating bracket according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the assembly of the electromagnetic trip unit according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the internal structure of the cover according to an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the auxiliary push rod assembly structure according to an embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of the wiring unit assembly structure according to an embodiment of the present utility model.

[0023] Figure 9 This is an exploded view of the outgoing terminal assembly installation according to an embodiment of this utility model.

[0024] Figure 10 This is a front view of the internal structure of the middle cover in an embodiment of this utility model. Detailed Implementation

[0025] like Figures 1-10 As shown, an embodiment of this utility model provides a circuit breaker with independent opening and closing for each pole, including a housing 1. Inside the housing 1, three sets of operating units 2 and wiring units 3 are arranged side by side along the width direction.

[0026] Each operating unit 2 includes a corresponding arc extinguishing component 4, auxiliary push rod component 5, handle component 6, operating mechanism 7, and electromagnetic trip unit component 8. The arc extinguishing component 4 has an auxiliary push rod component 5 on its top and an operating mechanism 7 on one side. The handle component 6 is mounted on the operating mechanism 7 via a pin (not shown). The electromagnetic trip unit component 8 is mounted on the side of the operating mechanism 7 away from the arc extinguishing component 4.

[0027] Operating mechanism 7 includes operating bracket 71, which houses a jump stop 72. The jump stop 72 is connected to an upper connecting rod 73 via a pin (not shown). The upper connecting rod 73 is hinged to a lower connecting rod 74 via a hinge shaft (not shown). The lower connecting rod 74 is fitted with a rotating shaft 75 via a shaft hole. A moving contact 76 is located inside the rotating shaft 75. One end of the moving contact 76 is engaged within the rotating shaft 75, and the other end extends into the arc-extinguishing assembly 4, corresponding to the stationary contact 35 of the phase line terminal 31. A moving contact 761 is located at the end of the jump stop 72 away from the arc-extinguishing assembly 4. A re-latch 77 is connected to the re-latch 77. The guide rod 78 and the traction rod 78 are connected and fixedly installed on the operating bracket 71 through the re-clamp 77. A locking shaft 79 is provided between the re-clamp 77 and the jump buckle 72. The locking shaft 79 penetrates the wall of the operating bracket 71. A lock 791 located inside the operating bracket 71 is installed on the locking shaft 79. The operating bracket 71 has two front screw holes 711 and two rear screw holes 712. The front screw holes 711 are designed with a vertical downward structure, and the rear screw holes 712 are designed with an inward flip structure. This design makes the mechanism narrower and more compact than similar products, improving the convenience of installation and saving space.

[0028] The electromagnetic trip unit 8 is installed in the operating mechanism 7. When the circuit breaker experiences overload or short circuit, the electromagnetic trip unit 8 can act quickly to disconnect the circuit breaker and protect the circuit. The electromagnetic trip unit 8 includes a magnetic yoke 81 located below the latch 791 and an armature bracket 82 installed on the magnetic yoke 81. An armature 83 is installed on the armature bracket 82. One end of the armature 83 is installed on the armature bracket 82, and the other end extends through a bend to the space between the latch 791 and the traction rod 78. A groove 781 is provided on the traction rod 78, and a magnet 782 is installed in the groove 781.

[0029] The housing 1 includes a base 11, a large cover 12 covering the base 11, and a middle cover 13 covering the large cover 12. A transparent cover 14 is installed on the middle cover 13. A base plate 15 is installed at the bottom of the base 11. The arc extinguishing assembly 4 and the operating mechanism 7 are installed inside the base 11. One end of the handle assembly 6 is installed on the operating mechanism 7 via a pin (not shown), and the other end extends to the outside of the middle cover 13 through the handle groove provided in the large cover 12 and the corresponding opening groove provided in the middle cover 13. The large cover 12 has a position near the arc extinguishing assembly 4. A receiving groove 121 is provided to accommodate the auxiliary push rod assembly 5. The auxiliary push rod assembly 5 includes an auxiliary box 51 installed in the receiving groove 121 and an auxiliary transparent cover 52 snapped onto the auxiliary box 51. A micro switch 53 (not shown) is provided inside the auxiliary box 51, and an auxiliary push rod 54 is inserted into it via an interference fit. The auxiliary push rod 54 extends out of the auxiliary box 51 through a push rod slot and is correspondingly positioned to correspond with the handle assembly 6. In addition, the large cover 12 is located on the side of the traction rod 78 away from the operating mechanism 7. A placement groove 122 is provided on the side for placing a magnet 782. The placement groove 122 has an opening corresponding to the groove 781 on the traction rod 78. One end of the magnet 782 is engaged in the placement groove 122, and the other end is installed in the groove 781 of the traction rod 78 by interference fit. At the same time, a button groove 123 is provided on one side of the magnet 782 on the large cover 12. The button 124 is installed in the button groove 123 and corresponds to the top side of the traction rod 78. A heating element 9 is also installed in the base 11. A double metal 91 is installed on component 9. One end of the double metal 91 is installed on the thermal element 9, and the other end extends to the traction rod 78. The base 11 is also equipped with a current transformer 111 that corresponds to the three sets of operating units 2 in position and a zero-sequence current transformer 112 for connecting the current transformer 111. The middle cover 13 has a slot corresponding to the transparent cover 14. The slot is equipped with a power module 141, a measurement unit module 142, and a three-phase carrier module 143. The slot is also equipped with a battery slot, and the battery slot is equipped with a battery box 144.

[0030] Wiring unit 3 includes three sets of phase wire terminal pieces 31 and outgoing terminal assemblies 32, which correspond to the three sets of operating units 2 in position, and a set of common terminal pieces 33 and common outgoing terminal assemblies 34 for connecting the neutral wire. The three sets of phase wire terminal pieces 31 and the set of common terminal pieces 33 are all stationary contacts. The stationary contact includes a terminal 311 for connecting to the conductor and a contact end 312 for contacting the moving contact. The contact end 312 extends in an arc shape into the arc-extinguishing assembly 4 of the corresponding operating unit 2 and is provided at the end. A stationary contact 35 is provided. Three sets of outgoing terminal assemblies 32 and one set of common outgoing terminal assemblies 34 are installed on the base 11. Each of them includes four rectangularly arranged wiring frames 321 and a connecting plate 322. The connecting plate 322 is installed inside the corresponding four wiring frames 321 by snap-fit. Each wiring frame 321 is provided with a threaded hole. A wiring screw 323 is inserted into each threaded hole. The end of the wiring screw 323 abuts against the connecting plate 322. A terminal cover 324 installed inside the large cover 12 is provided on the wiring screw 323.

[0031] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A circuit breaker with independent opening and closing for each pole, characterized in that: The device includes a housing. Inside the housing, three sets of operating units and a wiring unit are arranged side-by-side along the width direction. Each set of operating units includes an arc-extinguishing component, an auxiliary push rod component, a handle component, an operating mechanism, and an electromagnetic trip unit component. The top of the arc-extinguishing component is equipped with an auxiliary push rod component, and an operating mechanism is provided on one side. The handle component is mounted on the operating mechanism via a pin. The electromagnetic trip unit is mounted on the side of the operating mechanism away from the arc-extinguishing component. The wiring unit includes three sets of phase wire terminal pieces and outgoing terminal pieces corresponding to the three sets of operating units in position, and one set of common terminal pieces and common outgoing terminal pieces for connecting the neutral wire. Each set of phase wire terminal pieces extends into the arc-extinguishing component of the corresponding operating unit and is provided with a stationary contact at its end.

2. The circuit breaker with independent switching on and off of each pole according to claim 1, characterized in that: The operating mechanism includes an operating bracket. A jump catch is installed inside the operating bracket. An upper connecting rod is connected to the jump catch via a pin. A lower connecting rod is hinged to the upper connecting rod via a hinge shaft. A rotating shaft is installed on the lower connecting rod through a shaft hole. A moving contact is located inside the rotating shaft. One end of the moving contact is engaged inside the rotating shaft, and the other end extends into the arc-extinguishing assembly, corresponding to the stationary contact of the phase wire terminal piece. A moving contact is also located at the end of the moving contact. A re-catch is located at the end of the jump catch away from the arc-extinguishing assembly. A traction rod is connected to the re-catch and fixedly installed on the operating bracket via the re-catch. A locking shaft is located between the re-catch and the jump catch, penetrating the wall of the operating bracket. A locking buckle located inside the operating bracket is installed on the locking shaft. The operating bracket includes a front screw hole and a rear screw hole. The front screw hole is vertically downward, and the rear screw hole is inwardly oriented.

3. The circuit breaker with independent switching for each pole according to claim 2, characterized in that: The electromagnetic trip unit assembly is installed in the operating mechanism and includes a magnetic yoke located below the latch and an armature bracket mounted on the magnetic yoke. An armature is mounted on the armature bracket, one end of the armature is mounted on the armature bracket, and the other end extends through a bend to the space between the latch and the traction rod. A groove is provided on the traction rod, and a magnet is installed in the groove.

4. The circuit breaker with independent switching on and off of each pole according to claim 1, characterized in that: The housing includes a base, a large cover on the base, and a middle cover on the large cover. A transparent cover is installed on the middle cover. A base plate is installed at the bottom of the base. The arc extinguishing component and the operating mechanism are installed inside the base. One end of the handle component is installed on the operating mechanism via a pin, and the other end extends to the outside of the middle cover via a handle groove in the large cover and an opening groove in the corresponding position of the middle cover. The large cover has a receiving groove for accommodating the auxiliary push rod component near the arc extinguishing component. The large cover has a placement groove for placing a magnet on the side of the traction rod away from the operating mechanism. The placement groove has an opening corresponding to the groove on the traction rod. One end of the magnet is engaged in the placement groove, and the other end is installed in the groove of the traction rod by interference fit. The large cover has a button groove on one side of the magnet. The button is installed in the button groove and is positioned corresponding to the top side of the traction rod.

5. The circuit breaker with independent switching on and off of each pole according to claim 4, characterized in that: The auxiliary push rod assembly includes an auxiliary box installed in the receiving slot and an auxiliary transparent cover snapped onto the auxiliary box. The auxiliary box is equipped with a micro switch and an auxiliary push rod is inserted through an interference fit. The auxiliary push rod extends out of the auxiliary box through a push rod slot and is correspondingly set with the handle assembly.

6. The circuit breaker with independent switching on and off of each pole according to claim 4, characterized in that: The base is also equipped with a heating element, on which a double metal plate is mounted. One end of the double metal plate is mounted on the heating element, and the other end extends to the traction rod.

7. The circuit breaker with independent switching for each pole according to claim 1, characterized in that: The outgoing terminal assembly and the common outgoing terminal assembly are mounted on the base, and each includes four rectangularly arranged wiring frames and a connecting plate. The connecting plate is snapped into the corresponding four wiring frames. Each wiring frame is provided with a threaded hole, and a wiring screw is inserted into each threaded hole. The end of the wiring screw abuts against the connecting plate. The wiring screw is covered with a terminal cover installed inside the large cover.

8. The circuit breaker with independent switching on and off of each pole according to claim 1, characterized in that: Both the phase wire terminal block and the common terminal block are stationary contacts. The stationary contact includes a terminal block and a contact end. The contact end extends in an arc shape into the arc extinguishing component of the corresponding operating unit and has a stationary contact point at its end.

9. The circuit breaker with independent switching on and off of each pole according to claim 4, characterized in that: The base also contains current transformers that are positioned corresponding to the three sets of operating units, and a zero-sequence current transformer for connecting the current transformers.

10. The circuit breaker with independent switching on and off of each pole according to claim 4, characterized in that: The middle cover has a slot corresponding to the transparent cover. The slot contains a power module, a measurement unit module, and a three-phase carrier module. The slot also contains a battery compartment containing a battery box.

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