An electromagnetic leakage circuit breaker

Abstract

The application discloses an electromagnetic type electric leakage circuit breaker and relates to the technical field of circuit breakers, which comprises a 2P circuit breaker, an electric leakage protection mechanism and an additional circuit breaker. The electric leakage protection mechanism comprises a shell two, the inside of the shell two is provided with a controller and a zero sequence current transformer, the inside of the shell two is fixedly provided with a limiting plate, and the inside of the shell two is provided with a conductive assembly and a connection switching unit. The application is provided with multiple pairs of conductive wires which pass through the zero sequence current transformer. When an additional circuit breaker needs to be added for arranging a temporary power supply line, the 2P circuit breaker and the additional circuit breaker can share one electric leakage protection mechanism. The circuit arrangement cost is saved, the occupied space of the temporary distribution box is greatly reduced, and the situation that the distribution box is insufficient in space is avoided. In addition, when the electric leakage protection mechanism detects electric leakage, all circuit breakers can be tripped at the same time, and the risk of electric shock in the temporary power supply scene is reduced.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more particularly to an electromagnetic residual current circuit breaker. Background Technology

[0002] A circuit breaker is a protective electrical device used in power distribution systems to connect, carry, and disconnect normal circuit current, and to automatically cut off fault current when faults such as overload or short circuit occur in the circuit. Its core function is to ensure the safety of circuits and electrical equipment, and to prevent faults from escalating and causing equipment damage, fire, or electric shock accidents.

[0003] The principle of an electromagnetic circuit breaker is that when the circuit is short-circuited or overloaded, it will trip through a built-in electromagnetic trip unit or thermal trip unit. To further improve safety, the circuit breaker can also be equipped with a leakage current detection module. When the leakage current detection module detects leakage current in the line, it controls the electromagnetic trip unit to automatically trip, thereby realizing the leakage current protection function.

[0004] However, in traditional electromagnetic residual current circuit breakers (RCCBs), the circuit breaker and the residual current detection module are integrally formed and cannot be separated. In some temporary power supply scenarios, such as construction sites, outdoor construction, and temporary exhibitions, circuit breakers need to be frequently added or removed due to adjustments during the construction phase and the addition or removal of equipment. If a complete RCCB is used for each new circuit, it will lead to a significant increase in costs. Moreover, after reducing the number of circuits, the removed RCCBs will be left idle. In addition, since the RCCB includes a residual current detection module, it is relatively wide. Using multiple sets will occupy a lot of space in the distribution box and affect the circuit layout in temporary power supply scenarios. Summary of the Invention

[0005] The purpose of this invention is to address the problem that, under cost constraints, traditional residual current circuit breakers are not convenient to add or remove flexibly in temporary power supply scenarios, and that using multiple sets simultaneously will occupy a large amount of space in the temporary distribution box, affecting the circuit layout in temporary power supply scenarios. Therefore, an electromagnetic residual current circuit breaker is proposed.

[0006] To achieve the above objectives, the present invention employs the following technology: an electromagnetic leakage circuit breaker comprising a 2P circuit breaker, a leakage protection mechanism, and an additional circuit breaker; the leakage protection mechanism comprises a housing second, inside which a controller and a zero-sequence current transformer are installed; inside which a limit plate is fixed; and inside which conductive components and a connection switching unit are provided.

[0007] The conductive component includes six conductive lines that pass through the zero-sequence current transformer and are equidistant and parallel to each other around the center point of the zero-sequence current transformer. Both ends of the conductive lines are connected to electrode posts. The top and bottom of the limiting plate are fixed with fixing plates that are fixed to the electrode posts. Terminal block one and terminal block two are fixedly installed on the bottom of the housing two.

[0008] One pair of conductive wires is connected in series with the circuit where the 2P circuit breaker is located through the connection switching unit; when adding an additional circuit breaker, the additional circuit breaker is connected to the other pair of conductive wires through terminal one, so that the leakage protection mechanism can simultaneously provide leakage protection for the additional circuit breaker.

[0009] As a further description of the electromagnetic leakage circuit breaker of the above technology: an electrode plate is fixed on the side of the electrode post away from the center point of the zero-sequence current transformer, and the connection switching unit includes two copper plates, which are respectively in contact with the two paired electrode plates and connected in series with the circuit where the 2P circuit breaker is located.

[0010] As a further description of the electromagnetic leakage circuit breaker of the above technology: the connection switching unit also includes a turntable 1 rotatably connected to the limiting plate, and two copper plates 1 are symmetrically fixed on the turntable 1.

[0011] As a further description of the electromagnetic leakage circuit breaker described above: the terminal block is provided with two pairs of conductive wires, which are not connected in series with the circuit in which the 2P circuit breaker is located, and are respectively connected to the two pairs of terminal blocks through wires.

[0012] As a further description of the electromagnetic leakage circuit breaker of the above technology: the second terminal is provided with three pairs, and the three pairs of the second terminal are respectively connected to the electrode posts at the bottom of the three pairs of conductive wires through wires.

[0013] As a further description of the electromagnetic leakage circuit breaker described above, it also includes a second detection mechanism, which includes a turntable 2 rotatably connected to the bottom of a limiting plate. Two copper plates 2 are fixed on the turntable 2, symmetrical about the center point of the turntable 2. The two copper plates 2 are respectively connected to the two ends of a test resistor 2 through wires.

[0014] As a further description of the electromagnetic leakage circuit breaker described above, it also includes a first detection mechanism, which includes a conductive sheet 1 and a conductive sheet 2 respectively fixed to a turntable 1 and a turntable 2. The conductive sheet 1 and the conductive sheet 2 are electrically connected to a switch and a test resistor 1 is connected in series in the circuit.

[0015] As a further description of the electromagnetic residual current circuit breaker described above: the 2P circuit breaker includes a housing, a trip unit is installed inside the housing, and an operating handle is rotatably connected to one side of the housing.

[0016] As a further description of the electromagnetic leakage circuit breaker described above: the auxiliary circuit breaker is of the same model as the 2P circuit breaker, and the operating handle of the auxiliary circuit breaker is slidably connected to a pin that is inserted into an adjacent operating handle.

[0017] In summary, due to the adoption of the above-mentioned technology in the electromagnetic residual current circuit breaker, the beneficial effects of this invention are:

[0018] 1. This application features multiple pairs of conductive wires passing through the zero-sequence current transformer. When additional circuit breakers are needed to arrange temporary power supply lines, the conductors of the additional circuit breakers are connected in series with one pair of conductive wires through terminal block one and electrode post. When the controller detects a line leakage through the zero-sequence current transformer, it controls the trip unit to open the contacts in the 2P circuit breaker. At this time, the operating handle on one side of the housing drives the operating handle of the additional circuit breaker downward to the open position through the pin, causing all additional circuit breakers to trip simultaneously. The modular design of the additional circuit breakers in this application facilitates the flexible addition or reduction of power circuits in temporary circuit layouts and facilitates the rapid arrangement of temporary power lines. Moreover, the 2P circuit breaker and the additional circuit breaker can share a single leakage protection mechanism, saving circuit layout costs while significantly reducing the space occupied by the temporary distribution box and avoiding insufficient space in the distribution box. In addition, the leakage protection mechanism can cause all circuit breakers to trip simultaneously when leakage is detected, reducing the risk of electric shock in temporary power supply scenarios.

[0019] 2. After the leakage current trips, manually slide the pin to separate the operating handle of the circuit breaker. Since the circuit breaker on the leakage circuit will automatically trip after being closed, the other circuit breakers can be closed smoothly. Therefore, by closing each circuit breaker in sequence, the leakage circuit can be identified, achieving the effect of rapid location of the leakage circuit, which facilitates timely maintenance of the leakage circuit.

[0020] 3. This application allows for switching of the conductive wire connected in series with the 2P circuit breaker via a connection switching unit. When the conductive wire is damaged, there is no need to replace the entire residual current circuit breaker. The backup conductive wire can be connected to the circuit simply by connecting the switching unit, quickly restoring the residual current protection function. This design significantly reduces maintenance costs and downtime in temporary power supply scenarios. Power supply can be quickly restored when the conductive wire is damaged, reducing project delays.

[0021] 4. The first detection mechanism can generate a current difference on a pair of conductive wires connected to it to simulate leakage and check whether the leakage protection mechanism is normal. Conductive plate one and conductive plate two are respectively installed on turntable one and turntable two. When the conductive wire connected to the 2P circuit breaker is switched, the first detection mechanism can still form a circuit with the conductive wire by turning turntable two to test whether the leakage protection mechanism is normal and improve the safety of the device.

[0022] 5. This application uses a second testing mechanism to form a circuit between a pair of connected conductive wires, thereby determining whether the conductive wires are normal by whether the leakage protection mechanism controls the 2P circuit breaker to trip, achieving a self-testing effect, avoiding the circuit from being unable to be protected by leakage due to damage to the conductive wires themselves, and this design can check whether the conductive wires are faulty when leakage occurs, avoiding ineffective troubleshooting. Attached Figure Description

[0023] Figure 1 An overall schematic diagram according to the present invention is shown;

[0024] Figure 2 An overall exploded view according to the present invention is shown;

[0025] Figure 3 A schematic diagram of the internal circuit elements of the housing according to the present invention is shown;

[0026] Figure 4 A schematic diagram of the installation of the current transformer according to the present invention is shown;

[0027] Figure 5 A schematic diagram of a turntable according to the present invention is shown;

[0028] Figure 6 The present invention is shown Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 A schematic diagram of the turntable 2 according to the present invention is shown;

[0030] Figure 8 A schematic diagram of a conductive component according to the present invention is shown;

[0031] Figure 9 A schematic diagram of the second detection mechanism according to the present invention is shown;

[0032] Figure 10 A simplified schematic diagram of the first detection state circuit according to the present invention is shown;

[0033] Figure 11 A simplified schematic diagram of the second detection state circuit according to the present invention is shown.

[0034] Legend:

[0035] 11. Housing 1; 12. Trip unit; 13. Operating handle; 14. Pin;

[0036] 21. Housing II; 22. Controller; 23. Zero-sequence current transformer; 24. Limiting plate; 25. Conductive component; 251. Conductive wire; 252. Fixing plate; 253. Electrode post; 254. Electrode sheet; 26. Connection switching unit; 261. Turntable I; 262. Copper sheet I; 27. Terminal block I; 28. Terminal block II;

[0037] 30. First testing unit; 31. Conductive sheet one; 32. Conductive sheet two; 33. Test resistor one; 34. Switch;

[0038] 40. Second testing unit; 41. Turntable 2; 42. Copper sheet 2; 43. Test resistor 2;

[0039] 50. Additional circuit breaker. Detailed Implementation

[0040] The electromagnetic residual current circuit breaker of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figures 1-11 As shown, the present invention provides an electromagnetic residual current circuit breaker, comprising a 2P circuit breaker, a residual current protection mechanism, and an auxiliary circuit breaker 50. The auxiliary circuit breaker 50 is of the same model as the 2P circuit breaker and is used to control the connection and disconnection of the neutral and live wires. The 2P circuit breaker and the residual current protection mechanism are integrally formed and cannot be separated. When a new circuit needs to be added for temporary power supply, the connection and disconnection of the new circuit can be controlled by adding the auxiliary circuit breaker 50 to ensure electrical safety.

[0042] Reference Figure 2 Both the 2P circuit breaker and the auxiliary circuit breaker 50 include a housing 11. An electromagnetic trip unit 12 is installed inside the housing 11. An operating handle 13 is rotatably connected to one side of the housing 11. When the circuit is short-circuited, the current passing through the housing 11 increases instantaneously. At this time, the housing 11 uses the large current to generate a strong magnetic field and uses the magnetic force as a driving force to disconnect the circuit, thereby achieving automatic tripping during short circuit.

[0043] Reference Figure 3 and Figure 4 The leakage protection mechanism includes a housing 21, inside which a controller 22 and a zero-sequence current transformer 23 are installed. Inside the housing 21, a limiting plate 24 for clamping and limiting the zero-sequence current transformer 23 is fixed. The controller 22 and the limiting plate 24 are connected by wires.

[0044] The principle of the leakage current protection mechanism is to detect the residual current in the circuit through the zero-sequence current transformer 23. When the residual current reaches the set threshold, the trip unit 12 is controlled to generate magnetic force, causing the 2P circuit breaker to trip.

[0045] Reference Figures 4-8In a traditional residual current circuit breaker, the neutral and live wires in the circuit where the circuit breaker is located pass through the zero-sequence current transformer 23. Under normal circumstances, the current values ​​passing through the neutral and live wires are the same, and the magnetic fields generated around them cancel each other out. In the event of a leakage, the current values ​​passing through the neutral and live wires are different. At this time, the zero-sequence current transformer 23 determines whether there is a leakage by detecting whether the magnetic fields of the neutral and live wires cancel each other out. Based on this principle, in order to save costs and space occupied by the distribution box in temporary power supply scenarios, and to protect multiple circuit breakers with a single residual current protection mechanism, a conductive component 25 is specially set inside the housing 21.

[0046] The conductive component 25 includes at least six conductive wires 251 that pass through the zero-sequence current transformer 23 and are equidistantly arranged around the center point of the zero-sequence current transformer 23 and are parallel to each other. For ease of description, this application takes the arrangement of six conductive wires 251 as an example. The six conductive wires 251 are paired up, and each pair of two conductive wires 251 is symmetrical about the center point of the zero-sequence current transformer 23. The function is that when a pair of two conductive wires 251 are connected to the neutral wire and the live wire of the circuit breaker respectively, the zero-sequence current transformer 23 can determine whether the circuit is leaking current by detecting whether the magnetic field generated by the current passing through the two conductive wires 251 cancels each other out. Among them, the pair of two conductive wires 251 are connected in series with the neutral wire and the live wire in the circuit where the 2P circuit breaker is located, and the remaining conductive wires 251 can be used to connect an external additional circuit breaker 50.

[0047] Both ends of the conductive wire 251 are connected to electrode posts 253. The top and bottom of the limiting plate 24 are fixed with fixing disks 252 that are fixed to the electrode posts 253. The bottom of the housing 21 is fixed with terminal block 27 and terminal block 28.

[0048] Reference Figure 2 and Figure 3 Terminal 1 27 has two pairs of conductors. Except for one pair of conductors 251 connected in series with the live and neutral wires of the 2P circuit breaker, the other two pairs of conductors 251 are connected to the two pairs of terminal 1 27 through wires. Terminal 2 28 has three pairs of conductors. The three pairs of terminal 28 are connected to the electrode posts 253 at the bottom of the three pairs of conductors 251 through wires.

[0049] When adding an additional circuit breaker 50, the neutral and live wires of the circuit where the additional circuit breaker 50 is located are connected to two pairs of terminals 27 respectively. At this time, the neutral and live wires of the circuit where the additional circuit breaker 50 is located are connected in series through terminals 27, electrode post 253 and one pair of conductive wires 251. Terminal 28, which is connected to the conductive wires 251 through a wire, is used for external circuit connection. After the circuit is connected, the current passes through the neutral and live wires, terminals 27, electrode post 253, conductive wires 251 and terminal 28 to supply power to external electrical equipment.

[0050] It should be noted that, in order to avoid wiring confusion, the two terminals 27 and two terminals 28 connected to each pair of conductive wires 251 are arranged close together at the bottom of the housing 21.

[0051] Reference Figure 2 The operating handle 13 of the auxiliary circuit breaker 50 is slidably connected to a pin 14 that is inserted into the adjacent operating handle 13. After another auxiliary circuit breaker 50 is added, the operating handles 13 of the two auxiliary circuit breakers 50 are also connected by the pin 14. When the leakage protection mechanism detects leakage, it controls the trip unit 12 of the 2P circuit breaker to generate magnetic force, causing the 2P circuit breaker to trip. At this time, the operating handle 13 of the 2P circuit breaker deflects downward to the open position, and drives the operating handles 13 of the other auxiliary circuit breakers 50 to deflect synchronously through the pin 14, so that each auxiliary circuit breaker 50 trips synchronously. This design is used to disconnect all circuits at the same time when a leakage occurs in a certain circuit, minimizing the safety risk. It is suitable for temporary power supply scenarios with complex environments, non-professional personnel, and high mobility of equipment and personnel.

[0052] After the leakage current trips, the operating handle 13 of the circuit breaker is separated by manually sliding the pin 14. Since the circuit breaker on the leakage circuit will automatically trip after being closed, the other circuit breakers can be closed smoothly. Therefore, the leakage circuit can be identified by closing each circuit breaker in sequence, which facilitates timely maintenance of the leakage circuit.

[0053] Reference Figure 5 and Figure 6 An electrode plate 254 is fixed on the side of the electrode post 253 away from the center point of the zero-sequence current transformer 23. A connection switching unit 26 is provided between the electrode plate 254 and the live and neutral wires of the 2P circuit breaker. The connection switching unit 26 includes a turntable 261 rotatably connected to the limiting plate 24. Two copper plates 262 are fixed on the turntable 261 symmetrically around the center point of the turntable 261. The two copper plates 262 are respectively in contact with the two paired electrode plates 254 and are connected in series with the circuit where the 2P circuit breaker is located through a wire.

[0054] One side of the turntable 261 penetrates the side wall of the housing 21 and protrudes outward. By manually turning the turntable 261, the turntable 261 drives the copper plate 262 to rotate, which can adjust the position of the copper plate 262 and switch the electrode plate 254 connected to the copper plate 262. This allows the live and neutral wires of the 2P circuit breaker to be connected to the electrode posts 253 at both ends of different conductive wires 251 through the copper plate 262 and the electrode plate 254. Thus, when one pair of conductive wires 251 is damaged, the remaining conductive wires 251 can be connected for use, ensuring the normal use of the leakage circuit breaker and reducing maintenance costs and downtime in temporary power supply scenarios.

[0055] Reference Figure 7Based on the above design, in order to facilitate the detection of whether the conductive wire 251 is normal, a second detection mechanism 40 is set inside the housing 21. The second detection mechanism 40 includes a turntable 41 rotatably connected to the bottom of the limiting plate 24. Two copper plates 42 are fixed on the turntable 41 symmetrical about the center point of the turntable 41. A test resistor 43 is installed inside the turntable 41. The two copper plates 42 are respectively connected to the two ends of the test resistor 43 through wires.

[0056] One side of turntable 41 penetrates the side wall of housing 21 and protrudes outward. Manually turning turntable 41 causes copper sheet 42 to deflect and contact the electrode plate 254 at the bottom of conductive wire 251. At this time, as... Figure 11 As shown, the live and neutral wires, a pair of conductive wires 251, copper sheet 2 42 and test resistor 2 43 form a circuit. The function of conductive wire 251 can be determined by whether the leakage protection mechanism drives the 2P circuit breaker to trip. By rotating the turntable 2 41, the conductive wire 251 connected in series can be switched, thereby realizing the self-test of each conductive wire 251.

[0057] Reference Figure 2 and Figure 5-7 Inside the housing 21, a first detection mechanism 30 is also provided. Since the first detection mechanism 30 needs to be adapted to the position of the conductive line 251 connected to the circuit of the switching unit 26, the first detection mechanism 30 includes a conductive sheet 31 and a conductive sheet 32 ​​that are fixed to the turntable 261 and the turntable 41 respectively. A switch 34 is electrically connected between the conductive sheet 31 and the conductive sheet 32, and a test resistor 33 is connected in series in the circuit. The conductive sheet 31 and the test resistor 33 are both installed inside the housing 21.

[0058] When switch 34 is pressed, if Figure 10 As shown, a loop is formed between the live and neutral wires, a pair of conductive wires 251, conductive sheet 31, conductive sheet 32, test resistor 33, and switch 34. At this time, no current flows through the position where one of the conductive wires 251 passes through the zero-sequence current transformer 23. The magnetic field formed by the pair of conductive wires 251 cannot be canceled, simulating a leakage current situation. When the zero-sequence current transformer 23 detects a leakage current, the controller 22 controls the 2P circuit breaker to trip, thereby determining whether the controller 22 and the zero-sequence current transformer 23 are normal, and ensuring the safety of the circuit.

[0059] After the conductor 251 connected in series with the 2P circuit breaker is switched, the electrode post 253 connected in series with the conductor plate 31 and the conductor 251 are changed. At this time, the position of the conductor plate 32 is adjusted by rotating the turntable 41 so that the conductor plate 32 and the other conductor 251 symmetrical to the above conductor 251 are connected in series through the electrode post 253. Thus, the first detection mechanism 30 can continue to detect whether the leakage protection mechanism is intact.

[0060] It should be noted that, since turntable 261 and turntable 41 need to be deflected, the wires connected to conductive sheet 31, conductive sheet 32 ​​and copper sheet 262 all need to have a certain length reserved.

[0061] Working principle: When setting up a temporary circuit, the neutral and live wires are connected to the top of the 2P circuit breaker. The neutral and live wires at the bottom of the 2P circuit breaker are connected to two copper plates 262 through wires. The two copper plates 262 are respectively in contact with the two electrode plates 254 at the top of a pair of conductive wires 251. The terminal 28 connected to the bottom electrode post 253 of the pair of conductive wires 251 through wires is used to connect external electrical equipment.

[0062] When the zero-sequence current transformer 23 detects leakage current, the controller 22 controls the trip unit 12 to trip the 2P circuit breaker, thereby achieving the circuit protection effect.

[0063] When the 2P circuit breaker is closed, the rotary table 41 is turned to drive the copper sheet 42 to rotate and contact the electrode 254, so that a pair of conductive wires 251 are connected to the circuit. At this time, the current in the two conductive wires 251 is the same. If the leakage protection mechanism does not trip the 2P circuit breaker, it can be determined that the pair of conductive wires 251 are intact. Otherwise, it is necessary to switch the conductive wires 251.

[0064] Manually turn the turntable 261 to rotate the copper sheet 262, switch the electrode 254 that is in contact with the copper sheet 262, and connect another pair of conductive wires 251 to the circuit through the electrode post 253 and the electrode 254.

[0065] When adding an additional circuit breaker 50, the live and neutral wires below the additional circuit breaker 50 are connected to a pair of terminals 27 via wires. At this time, the circuit where the additional circuit breaker 50 is located is connected in series with a pair of conductive wires 251 through terminals 27, electrode posts 253, and each pair of conductive wires 251 can still maintain magnetic field cancellation.

[0066] The manual sliding pin 14 is inserted into the operating handle 13 of the 2P circuit breaker. When the leakage protection mechanism detects leakage and causes the 2P circuit breaker to trip, the operating handle 13 of the 2P circuit breaker deflects downward to the open position. The pin 14 drives the operating handle 13 of the auxiliary circuit breaker 50 to deflect, causing the auxiliary circuit breaker 50 to trip synchronously, thereby realizing leakage protection for the auxiliary circuit breaker 50.

[0067] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the electromagnetic leakage circuit breaker and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. An electromagnetic residual current circuit breaker, comprising a 2P circuit breaker, a residual current protection mechanism, and an additional circuit breaker (50), wherein the residual current protection mechanism comprises a housing second (21), wherein a controller (22) and a zero-sequence current transformer (23) are installed inside the housing second (21), and a limit plate (24) is fixed inside the housing second (21), characterized in that, The interior of the second housing (21) is provided with a conductive component (25) and a connection switching unit (26). The conductive component (25) includes six conductive wires (251) that pass through the zero-sequence current transformer (23) and are equidistant and parallel to each other around the center point of the zero-sequence current transformer (23). Both ends of the conductive wires (251) are connected to electrode posts (253). The top and bottom of the limiting plate (24) are fixed with fixing disks (252) that are fixed to the electrode posts (253). The bottom of the housing (21) is fixed with terminal block one (27) and terminal block two (28). One pair of conductive wires (251) is connected in series with the circuit where the 2P circuit breaker is located through the connection switching unit (26); when an additional circuit breaker (50) is added, the additional circuit breaker (50) is connected to another pair of conductive wires (251) through terminal one (27), so that the leakage protection mechanism can simultaneously provide leakage protection for the additional circuit breaker (50).

2. The electromagnetic residual current circuit breaker according to claim 1, characterized in that, The electrode post (253) is fixed with an electrode piece (254) on the side away from the center point of the zero-sequence current transformer (23). The connection switching unit (26) includes two copper plates (262). The two copper plates (262) are in contact with the two paired electrode pieces (254) and connected in series with the circuit where the 2P circuit breaker is located.

3. An electromagnetic residual current circuit breaker according to claim 2, characterized in that, The connection switching unit (26) also includes a turntable (261) rotatably connected to the limiting plate (24), and two copper plates (262) are symmetrically fixed on the turntable (261).

4. An electromagnetic residual current circuit breaker according to claim 1, characterized in that, The terminal block (27) is provided with two pairs of conductive wires (251) that are not connected in series with the circuit where the 2P circuit breaker is located. These two pairs of conductive wires are connected to the two pairs of terminal blocks (27) respectively through wires.

5. An electromagnetic residual current circuit breaker according to claim 1, characterized in that, The second terminal block (28) is provided with three pairs, and the three pairs of the second terminal blocks (28) are respectively connected to the electrode posts (253) at the bottom of the three pairs of conductive wires (251) through wires.

6. An electromagnetic residual current circuit breaker according to claim 3, characterized in that, It also includes a second detection mechanism (40), which includes a turntable (41) rotatably connected to the bottom of the limiting plate (24). Two copper plates (42) are fixed on the turntable (41) symmetrical about the center point of the turntable (41). The two copper plates (42) are respectively connected to the two ends of the test resistor (43) through wires.

7. An electromagnetic residual current circuit breaker according to claim 6, characterized in that, It also includes a first detection mechanism (30), which includes a first conductive sheet (31) and a second conductive sheet (32) fixed to a first turntable (261) and a second turntable (41) respectively. A switch (34) is electrically connected between the first conductive sheet (31) and the second conductive sheet (32), and a test resistor (33) is connected in series in the circuit.

8. An electromagnetic residual current circuit breaker according to claim 1, characterized in that, The 2P circuit breaker includes a housing (11), inside which a trip unit (12) is installed, and an operating handle (13) is rotatably connected to one side of the housing (11).

9. An electromagnetic residual current circuit breaker according to claim 8, characterized in that, The additional circuit breaker (50) is the same model as the 2P circuit breaker, and the operating handle (13) of the additional circuit breaker (50) is slidably connected with a pin (14) inserted into the adjacent operating handle (13).

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