A small assembled modular residual current circuit breaker

Abstract

The present invention discloses a small assembled modular leakage protection circuit breaker. The circuit breaker unit includes at least one circuit breaker, and the leakage protection unit includes a leakage protection housing, a leakage protection electronic circuit PCB board, and a zero-sequence current transformer. On the side walls of the circuit breaker housing near the upper and lower terminal connection positions of the circuit breaker, an upper port channel and a lower port channel are respectively provided. The upper port channel includes a plurality of holes for respectively passing through the leakage detection lead-out wire and the leakage detection return wire. The leakage detection lead-out wire and the leakage detection return wire are in one-to-one correspondence and are connected to the upper port terminal. The solder joints of the leakage detection lead-out wire and the corresponding leakage detection return wire are arranged outside the housing of the circuit breaker. An opening part is provided on the leakage protection housing. The small assembled modular leakage protection circuit breaker provided by the present invention has a simple structure, convenient wiring, high combination and assembly efficiency, and has the characteristics of small volume, low cost, and simplified process.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and particularly to a small assembled combined leakage protection circuit breaker. Background Art

[0002] The assembled leakage protection switch is applicable to the situation where when a person gets an electric shock or the grid leakage current exceeds the rated value, the residual current action can quickly cut off the faulty power supply within a short time to protect the safety of the person and the electrical equipment. It also has the functions of providing overload, short - circuit, and under - voltage protection for the equipment. The existing assembled leakage circuit breaker includes a leakage module and a circuit breaker. Both the live wire and the neutral wire of the leakage circuit breaker need to pass through the zero - sequence current transformer, and the zero - sequence current transformer is usually arranged in the leakage module of the leakage circuit breaker. For the live wire connected in the circuit breaker to pass through the zero - sequence current transformer, the live wire in the circuit breaker needs to be wound from the outside of the leakage circuit breaker to the leakage module and pass through the zero - sequence current transformer in the leakage module. The wiring length of the line is relatively long, and the wiring in the circuit breaker and the leakage module is also relatively complex. In addition, in order to protect the external lead, a lead cover needs to be installed outside, which increases the volume of the leakage circuit breaker, causing a large amount of repeated waste of raw materials and occupation of space. In addition, during the production process of the leakage circuit breaker, it is necessary to combine the circuit breaker and the leakage module for production and manufacturing, and the welding and fixing process of the connecting wires is complex. Summary of the Invention

[0003] The purpose of the present invention is to provide a small assembled combined leakage protection circuit breaker, which has a simple structure, convenient wiring, high combination and assembly efficiency, and has the characteristics of small volume, low cost, and simplified process.

[0004] To achieve the above - mentioned purpose, the present invention provides the following solution:

[0005] A small assembled combined leakage protection circuit breaker includes a circuit breaker unit and a leakage protection unit assembled together. The circuit breaker unit and the leakage protection unit pull the leakage lock through a leakage protection release, and push the circuit breaker lock to force the circuit breaker unit to disconnect and act. The circuit breaker unit includes at least one circuit breaker, and the leakage protection unit is arranged outside the housing of the circuit breaker. The leakage protection unit includes a leakage protection housing, a leakage protection electronic circuit PCB board, and a zero - sequence current transformer;

[0006] On the side wall of the circuit breaker housing near the positions of the upper - port wiring terminal and the lower - port wiring terminal of the circuit breaker, an upper - port channel and a lower - port channel are respectively arranged. The upper - port channel includes a plurality of holes for respectively passing through the leakage detection lead - out wire and the leakage detection return wire. The leakage detection lead - out wire and the leakage detection return wire correspond one by one and are connected to the upper - port wiring terminal. The lower - port channel is used for passing through the power supply lead connected to the lower - port wiring terminal, and the power supply lead provides working power for the leakage protection electronic circuit PCB board;

[0007] The leakage detection lead wire passes through the zero-sequence current transformer and is then welded to the corresponding leakage detection return wire, and the welding point is arranged outside the housing of the circuit breaker; the power supply lead wire is welded to the PCB board of the leakage protection electronic circuit.

[0008] An opening is provided on the leakage protection housing. When the circuit breaker unit and the leakage protection unit are assembled together, the zero-sequence current transformer that has completed the wire threading and welding process is inserted into the leakage protection unit from the opening.

[0009] Optionally, the leakage protection unit further includes a neutral wire, an upper neutral wire terminal, and a lower neutral wire terminal. The neutral wire passes through the zero-sequence current transformer, and both ends of the neutral wire are respectively connected to the upper neutral wire terminal and the lower neutral wire terminal.

[0010] Optionally, the circuit breaker unit includes an A-phase circuit breaker, a B-phase circuit breaker, and a C-phase circuit breaker arranged adjacent to each other. The A-phase circuit breaker is arranged adjacent to the leakage protection unit. A-phase upper channels, B-phase upper channels, and C-phase upper channels are respectively provided on the housings of the A-phase circuit breaker, the B-phase circuit breaker, and the C-phase circuit breaker; a C-phase leakage detection lead wire and a C-phase leakage detection return wire pass through the C-phase circuit breaker, a B-phase leakage detection lead wire and a B-phase leakage detection return wire pass through the B-phase circuit breaker, and an A-phase leakage detection lead wire and an A-phase leakage detection return wire pass through the A-phase circuit breaker.

[0011] The C-phase leakage detection lead wire and the C-phase leakage detection return wire sequentially pass through the C-phase upper channel, the B-phase upper channel, and the A-phase upper channel. The C-phase leakage detection lead wire passes through the zero-sequence current transformer and is welded to the C-phase leakage detection return wire; the B-phase leakage detection lead wire and the B-phase leakage detection return wire sequentially pass through the B-phase upper channel and the A-phase upper channel. The B-phase leakage detection lead wire passes through the zero-sequence current transformer and is welded to the B-phase leakage detection return wire; the A-phase leakage detection lead wire and the A-phase leakage detection return wire pass through the A-phase upper channel. The A-phase leakage detection lead wire passes through the zero-sequence current transformer and is welded to the A-phase leakage detection return wire.

[0012] Optionally, the circuit breaker unit includes an A-phase circuit breaker. An A-phase leakage detection lead wire and an A-phase leakage detection return wire pass through the A-phase circuit breaker. An A-phase upper channel is respectively provided on the housing of the A-phase circuit breaker. The A-phase leakage detection lead wire and the A-phase leakage detection return wire pass through the A-phase upper channel. The A-phase leakage detection lead wire passes through the zero-sequence current transformer and is welded to the A-phase leakage detection return wire.

[0013] Optionally, the opening part is a partial opening structure provided on the leakage protection housing.

[0014] Optionally, the leakage protection housing is a snap-cover structure, and the opening part is the opening side of the snap-cover structure.

[0015] Optionally, the leakage protection housing includes an assembled upper structure and a lower structure, and the opening part is the joint of the upper structure and the lower structure.

[0016] Optionally, the leakage protection electronic circuit PCB board includes an upper PCB board and a lower PCB board stacked up and down, and the upper PCB board and the lower PCB board are welded together through a pin row.

[0017] Optionally, the upper port channel or the lower port channel is a groove opening to the outside, and a plug board is arranged on the groove.

[0018] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention: for the small assembled combined leakage protection circuit breaker provided by the present invention, the leakage monitoring device is arranged at the upper port of the circuit breaker. When people touch the metal part at the lower port of the circuit breaker, the leakage protection unit also plays a role in protecting life safety; on the housing of the circuit breaker, there are upper port channels and lower port channels for passing through each lead. If there are multiple circuit breakers, the upper port channels and lower port channels on the housings of multiple circuit breakers are mutually communicated. The leakage detection lead-out wires and leakage detection return wires of each circuit breaker sequentially pass through the corresponding upper port channels, making full use of the internal structure of the circuit breaker housing, eliminating the need to set external wiring ports, simplifying the structure, saving materials, and reducing the volume of the circuit breaker; and the leakage detection lead-out wires and leakage detection return wires are two independent wires. Outside the circuit breaker housing, they pass through the zero-sequence current transformer and then are welded, avoiding internal wiring construction inside the circuit breaker housing, simplifying the production process, facilitating wiring operation, improving wiring efficiency, and saving time and effort; an opening part is provided on the leakage protection housing, which can be directly covered outside the zero-sequence current transformer after the circuit breaker structure is produced, and the relevant lines are covered inside, making the combined assembly more efficient and convenient; by installing a zero line, a zero line input terminal, a zero line output terminal and related supporting components on the leakage protection housing, the function of the zero line circuit breaker can be realized by using the leakage protection unit; each phase circuit breaker can also be produced in a standardized manner, improving the production efficiency of the leakage protection circuit breaker. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic diagram of welding and assembly of the (3P+N) / L type three-phase leakage circuit breaker according to an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of welding and assembly of the (1P+N) / L type single-phase leakage circuit breaker according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of welding and assembly of the 3P / L type three-phase (without neutral line) leakage circuit breaker according to an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of welding and assembly of the 2P / L type single-phase leakage circuit breaker according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the (3P+N) / L type leakage protection unit according to an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the (1P+N) / L type single-phase leakage protection unit according to an embodiment of the present invention;

[0026] Figure 7 Schematic diagram of the structure of the 3P / L type three-phase (without neutral line) leakage protection unit according to an embodiment of the present invention;

[0027] Figure 8 Schematic diagram of the structure of the 2P / L type single-phase leakage protection unit according to an embodiment of the present invention;

[0028] Figure 9 Schematic diagram of the assembly of the (3P+N) / L three-phase leakage circuit breaker according to an embodiment of the present invention;

[0029] Figure 10 Schematic diagram of the assembly of the (1P+N) / L single-phase leakage circuit breaker according to an embodiment of the present invention;

[0030] Figure 11 Schematic diagram of the assembly of the 3P / L single-phase leakage circuit breaker according to an embodiment of the present invention;

[0031] Figure 12 Schematic diagram of the assembly of the 2P / L single-phase leakage circuit breaker according to an embodiment of the present invention;

[0032] Figure 13 Explosion diagram of the (3P+N) / L type leakage circuit breaker according to an embodiment of the present invention;

[0033] Figure 14 First schematic diagram of the structure of the leakage protection housing according to an embodiment of the present invention;

[0034] Figure 15This is the second structural schematic diagram of the leakage protection housing according to the embodiment of the present invention;

[0035] Figure 16 This is the third structural schematic diagram of the leakage protection housing according to the embodiment of the present invention;

[0036] Figure 17 This is the structural schematic diagram of the double - layer PCB board according to the embodiment of the present invention;

[0037] Reference numerals: 1, A - phase circuit breaker; 1 - 1, B - phase circuit breaker; 1 - 2, C - phase circuit breaker; 1 - 3, N - pole neutral - line circuit breaker; 2, leakage protection unit; 3, leakage protection unit housing; 4, neutral zero - line; 5, zero - sequence current transformer; 6, zero - line switch mechanism; 7, upper - port wiring terminal of the zero - line; 8, lower - port wiring terminal of the zero - line; 9, circuit breaker housing; 10, A - phase leakage detection lead - out wire; 11, A - phase leakage detection return wire; 12, C - phase leakage detection lead - out wire channel; 13, C - phase leakage detection return wire channel; 14, leakage protection electronic circuit PCB board; 15, leakage protection electromagnetic tripping device; 16, circuit breaker tripping link; 17, circuit breaker handle; 18, leakage reset button; 19, B - phase leakage detection lead - out wire; 20, B - phase leakage detection return wire; 21, B - phase leakage detection lead - out wire channel; 22, B - phase leakage detection return wire channel; 23, C - phase leakage detection lead - out wire; 24, C - phase leakage detection return wire; 25, A - phase leakage detection lead - out wire channel; 26, blind plug; 27, lower - port channel; 28, plugging board; 29, local opening structure; 30, upper structure; 31, lower structure; 32, upper PCB board; 33, lower PCB board.

[0038] Point X is the welding point of the A - phase leakage detection lead - out wire and the return wire.

[0039] Point Y is the welding point of the B - phase leakage detection lead - out wire and the return wire.

[0040] Point Z is the welding point of the C - phase leakage detection lead - out wire and the return wire. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0042] The purpose of the present invention is to provide a small - sized assembled combined leakage protection circuit breaker and its production process, which has the characteristics of simple structure, convenient wiring, high combination and assembly efficiency, small volume, low cost, and simplified process.

[0043] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] As Figures 1 - 13 shown, the small assembled modular leakage protection circuit breaker provided by the present invention includes a circuit breaker unit and a leakage protection unit 2 assembled together. The circuit breaker unit and the leakage protection unit 2 drive a leakage lock through a leakage protection tripping device, and push a circuit breaker latch to force the circuit breaker unit to trip. The leakage protection tripping device includes a leakage protection electromagnetic tripping device 15, a circuit breaker tripping link 16, a circuit breaker handle 17, and a leakage reset button 18; the circuit breaker unit includes at least one circuit breaker, and the leakage protection unit is arranged outside the housing of the circuit breaker. The leakage protection unit 2 includes a leakage protection housing 3, a leakage protection electronic circuit PCB board 14, and a zero-sequence current transformer 5;

[0045] On the side walls of the circuit breaker housing near the upper and lower terminal connection positions of the circuit breaker, an upper port channel and a lower port channel 27 are respectively arranged. The upper port channel includes a plurality of holes for respectively passing through a leakage detection lead-out wire and a leakage detection return wire. The leakage detection lead-out wire and the leakage detection return wire correspond one by one and are connected to the upper port terminal; the lower port channel 27 is used for passing through a power lead connected to the lower port terminal, and the power lead provides a working power supply for the leakage protection electronic circuit PCB board 14;

[0046] Before the circuit breaker unit and the leakage protection unit 2 are assembled together, the leakage detection lead-out wire passes through the zero-sequence current transformer 5 and then is welded to the corresponding leakage detection return wire, and the welding point is arranged outside the housing of the circuit breaker; the power lead is welded to the leakage protection electronic circuit PCB board 14;

[0047] An opening part is arranged on the leakage protection housing. When the circuit breaker unit and the leakage protection unit 2 are assembled together, the zero-sequence current transformer 5 that has completed the wire threading and welding process is installed into the leakage protection unit 2 from the opening part.

[0048] In the first embodiment, as Figure 1 , 5, as shown in Figures 9 and 13, constitutes a (3P+N) / L type three-phase leakage circuit breaker. The circuit breaker unit includes the phase A circuit breaker 1, phase B circuit breaker 1-1, and phase C circuit breaker 1-2 arranged adjacent to each other. The phase A circuit breaker 1 is arranged adjacent to the leakage protection unit 2. Phase A upper port channels, phase B upper port channels, and phase C upper port channels are respectively arranged on the housings of the phase A circuit breaker 1, phase B circuit breaker 1-1, and phase C circuit breaker 1-2. A phase C leakage detection lead-out wire and a phase C leakage detection return wire pass through the phase C circuit breaker 1-2. A phase B leakage detection lead-out wire 19 and a phase B leakage detection return wire 20 pass through the phase B circuit breaker 1-1. A phase A leakage detection lead-out wire 10 and a phase A leakage detection return wire 11 pass through the phase A circuit breaker 1.

[0049] The phase C leakage detection lead-out wire 23 and the phase C leakage detection return wire 24 sequentially pass through the phase C upper port channel, phase B upper port channel, and phase A upper port channel. The phase C leakage detection lead-out wire 23 passes through the zero-sequence current transformer 5 and is welded to the phase C leakage detection return wire 24 to form a Z welding point. The phase B leakage detection lead-out wire 19 and the phase B leakage detection return wire 20 sequentially pass through the phase B upper port channel and phase A upper port channel. The phase B leakage detection lead-out wire 19 passes through the zero-sequence current transformer 5 and is welded to the phase B leakage detection return wire 20 to form a Y welding point. The phase A leakage detection lead-out wire 10 and the phase A leakage detection return wire 11 pass through the phase A upper port channel. The phase A leakage detection lead-out wire 10 passes through the zero-sequence current transformer 5 and is welded to the phase A leakage detection return wire 11 to form an X welding point. The phase A upper port channel, phase B upper port channel, and phase C upper port channel can each be provided with 8 holes, including a phase A leakage detection wire channel 25, a phase A leakage detection return wire channel, a phase B leakage detection wire channel 21, a phase B leakage detection return wire channel 22, a phase C leakage detection wire channel 12, and a phase C leakage detection return wire channel 13. The phase A upper port channel, phase B upper port channel, and phase C upper port channel are mutually connected.

[0050] In the (3P+N) / L type three-phase leakage circuit breaker, the leakage protection unit 2 further includes a neutral zero line, an upper zero line terminal 7 and a lower zero line terminal 8. The neutral zero line 4 passes through the zero-sequence current transformer 5, and both ends of the neutral zero line 4 are respectively connected to the upper zero line terminal 7 and the lower zero line terminal 8. Thus, an N-pole zero line circuit breaker can be formed by using the leakage protection unit. A zero line switch mechanism 6 is arranged between the upper zero line terminal 7 and the lower zero line terminal 8, so that when the live wire is cut off by the circuit breaker, the neutral zero line 4 in the leakage protection unit 2 is also in an open state. The (3P+N) / L type three-phase leakage circuit breaker is an assembled structure of a 3-pole circuit breaker that only has three live wires A, B, and C protected by the circuit breaker and the neutral line N is not protected by the circuit breaker and the leakage protection unit. The neutral line N is arranged inside the leakage protection unit, passes through the zero-sequence current transformer and is directly connected across the upper and lower terminal blocks. Or a neutral zero line switch mechanism can be arranged inside the leakage protection unit, so that when the three circuit breakers cut off the three-phase live wires, the neutral zero line is also disconnected by the zero line switch mechanism. The advantage of this is that the components with leakage protection functions are placed in the space inside the zero line circuit breaker, and all the leakage detection lines and the working power supply lines of the electronic circuit board are introduced into the leakage protection unit from the internal channels, so that the leakage protection function is added without increasing the volume of the ordinary bipolar or quadrupole circuit breaker.

[0051] In the second embodiment, as Figure 3 、 7 、11 shown, a 3P / L type three-phase (without neutral line) leakage circuit breaker is formed. The difference between it and the (3P+N) / L type three-phase leakage circuit breaker is that the leakage protection unit 2 does not include structures such as a neutral zero line, an upper zero line terminal 7 and a lower zero line terminal 8.

[0052] In the third embodiment, as Figure 2 、 6As shown in FIGS. 9 and 10, a (1P+N) / L type single-phase leakage circuit breaker is formed. The circuit breaker unit includes a circuit breaker, namely, phase A circuit breaker 1. A phase A leakage detection lead-out wire and a phase A leakage detection return wire extend out of the phase A circuit breaker 1. A phase A upper port channel is respectively provided on the housing of the phase A circuit breaker. The phase A leakage detection lead-out wire 10 and the phase A leakage detection return wire 11 pass through the phase A upper port channel. The phase A leakage detection lead-out wire 10 passes through the zero-sequence current transformer 5 and is welded to the phase A leakage detection return wire 11. In the (1P+N) / L type single-phase leakage circuit breaker, it is an assembly structure of a single-pole circuit breaker without circuit breaker protection for the neutral and zero line 4 and the leakage protection unit. The neutral and zero line 4 is arranged inside the leakage protection unit 2, and after passing through the zero-sequence current transformer 5, it is connected to the upper port wiring terminal 7 and the lower port wiring terminal 8 of the zero line. Or a zero-line switch mechanism 6 can be arranged inside the leakage protection unit, so that when the circuit breaker cuts off the live wire A, the neutral and zero line 4 is also disconnected by the zero-line switch mechanism. The advantage of this is that the components with leakage protection function are placed in the space inside the zero-line circuit breaker. All the leakage detection lines and the working power supply lines of the electronic circuit board are introduced into the leakage protection unit from the internal channels, so as to realize the addition of the leakage protection function without increasing the volume of the ordinary double-pole or four-pole circuit breaker.

[0053] In the fourth embodiment, as Figure 4 、 8 、12 shown, a 2P / L type single-phase leakage circuit breaker is formed. The difference between it and the (1P+N) / L type single-phase leakage circuit breaker is that the leakage protection unit 2 does not include structures such as the neutral and zero line, the upper port wiring terminal 7 of the zero line and the lower port wiring terminal 8 of the zero line, but a separate N-pole circuit breaker can be provided.

[0054] As Figure 14 shown, the opening part is a local opening structure 29 provided on the leakage protection housing.

[0055] As Figure 15 shown, the leakage protection housing is a snap-cover structure, and the opening part is the opening side of the snap-cover structure.

[0056] As Figure 16 shown, the leakage protection housing includes an assembled upper structure and a lower structure, and the opening part is the joint 31 between the upper structure 30 and the lower structure.

[0057] As Figure 17 shown, the leakage protection electronic circuit PCB board includes an upper PCB board 32 and a lower PCB board 33 stacked up and down, and the upper PCB board 32 and the lower PCB board 33 are welded together by a pin row.

[0058] As Figure 4As shown, the upper port channel is a groove opening to the outside, and a plug plate for sealing is provided on the groove; similarly, the lower port channel can also be a groove opening to the outside, and a plug plate for sealing is provided on the groove.

[0059] The working principle of the present invention is as follows: Connect the external load and the mains wire correctly to the small assembled combined leakage circuit breaker of the present invention according to the markings, and close the circuit breaker handle 17 to connect the power supply. Under normal circumstances, the difference between the round-trip currents of the live wire and the N neutral wire of the circuit breaker passing through the zero-sequence current transformer 5 flowing through the load is less than the standard specified value, and there is no tripping action output from the leakage protection electronic circuit PCB board 14; when the leakage current of the external load exceeds the limit, the leakage protection electronic circuit PCB board 14 generates an output, and the electromagnetic tripping device 15 quickly triggers the circuit breaker tripping link 16, and at the same time lifts the leakage reset button 18, causing the circuit breaker to trip and cut off the power. At this time, the leakage protection electronic circuit PCB board 14 also powers off and stops working. After the leakage fault is eliminated, manually press the reset button 18, and then the handle 17 can be closed again.

[0060] For the small assembled combined leakage protection circuit breaker provided by the present invention, upper port channels and lower port channels for passing through each lead are provided on the housing of the circuit breaker. If there are multiple circuit breakers, the upper port channels and lower port channels on the housings of the multiple circuit breakers are mutually communicated. The leakage detection lead-out wires and leakage detection return wires of each circuit breaker sequentially pass through the corresponding upper port channels, making full use of the internal structure of the circuit breaker housing, eliminating the need to set external wiring ports, simplifying the structure, saving materials, and reducing the volume of the circuit breaker; and the leakage detection lead-out wires and leakage detection return wires are two independent wires, which are welded after passing through the zero-sequence current transformer outside the circuit breaker housing, avoiding internal wiring construction inside the circuit breaker housing, simplifying the production process, facilitating wiring operation, improving wiring efficiency, and saving time and effort; an opening part is provided on the leakage protection housing, which can be directly covered outside the zero-sequence current transformer after the circuit breaker structure is produced, and the relevant lines are covered, making the combined assembly more efficient and convenient; by installing the neutral wire, neutral wire input terminal, neutral wire output terminal and related supporting components on the leakage protection housing, the function of the neutral wire circuit breaker can be realized by using the leakage protection unit; each phase circuit breaker can also be standardized in production, improving the production efficiency of the leakage protection circuit breaker.

[0061] In this specification, each embodiment is described in a progressive manner. The key points of each embodiment are the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0062] In this text, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. To sum up, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A small assembled combined leakage protection circuit breaker, comprising a circuit breaker unit and a leakage protection unit assembled together, characterized in that: The circuit breaker unit includes at least one circuit breaker, the leakage protection unit is arranged outside the housing of the circuit breaker, and the leakage protection unit includes a leakage protection housing, a leakage protection electronic circuit PCB board and a zero-sequence mutual inductor; An upper channel and a lower channel are respectively provided on the side wall of the circuit breaker housing near the upper terminal and the lower terminal of the circuit breaker, wherein the upper channel comprises a plurality of holes for respectively passing through a leakage detection lead wire and a leakage detection return wire, the leakage detection lead wire and the leakage detection return wire correspond to each other one by one and are connected to the upper terminal; the lower channel is used for passing through a power lead wire connected to the lower terminal, and the power lead wire provides working power for the leakage protection electronic circuit PCB board; The leakage detection lead wire passes through the zero-sequence mutual inductor and is then welded to the corresponding leakage detection return wire, and the welding point is arranged outside the housing of the circuit breaker; the power lead wire is welded to the leakage protection electronic circuit PCB board; The leakage protection housing is provided with an opening. When the circuit breaker unit and the leakage protection unit are assembled together, the zero-sequence mutual inductor that has completed the threading and welding process is installed into the leakage protection unit through the opening.

2. The small assembled modular residual current circuit breaker according to claim 1, characterized in that, The leakage protection unit also includes a neutral zero line, a neutral line upper terminal and a neutral line lower terminal. The neutral zero line passes through the zero-sequence mutual inductor, and two ends of the neutral zero line are respectively connected to the neutral line upper terminal and the neutral line lower terminal.

3. The small assembled modular residual current circuit breaker according to claim 1 or 2, characterized in that, The circuit breaker unit comprises an A-phase circuit breaker, a B-phase circuit breaker and a C-phase circuit breaker which are arranged adjacent to each other. The A-phase circuit breaker is arranged adjacent to the leakage protection unit. The housings of the A-phase circuit breaker, the B-phase circuit breaker and the C-phase circuit breaker are respectively provided with an A-phase upper opening channel, a B-phase upper opening channel and a C-phase upper opening channel; a C-phase leakage detection lead wire and a C-phase leakage detection return wire are passed through the C-phase circuit breaker, a B-phase leakage detection lead wire and a B-phase leakage detection return wire are passed through the B-phase circuit breaker, and an A-phase leakage detection lead wire and an A-phase leakage detection return wire are passed through the A-phase circuit breaker; The C-phase leakage detection lead wire and the C-phase leakage detection return wire pass through the C-phase upper channel, the B-phase upper channel and the A-phase upper channel in sequence, and the C-phase leakage detection lead wire passes through the zero-sequence mutual inductor and is welded together with the C-phase leakage detection return wire; the B-phase leakage detection lead wire and the B-phase leakage detection return wire pass through the B-phase upper channel and the A-phase upper channel in sequence, and the B-phase leakage detection lead wire passes through the zero-sequence mutual inductor and is welded together with the B-phase leakage detection return wire; the A-phase leakage detection lead wire and the A-phase leakage detection return wire pass through the A-phase upper channel, and the A-phase leakage detection lead wire passes through the zero-sequence mutual inductor and is welded together with the A-phase leakage detection return wire.

4. The small assembled modular residual current circuit breaker according to claim 1 or 2, characterized in that, The circuit breaker unit includes an A-phase circuit breaker. An A-phase leakage detection lead-out wire and an A-phase leakage detection return wire pass through the A-phase circuit breaker. An A-phase upper port channel is respectively arranged on the housing of the A-phase circuit breaker. The A-phase leakage detection lead-out wire and the A-phase leakage detection return wire pass through the A-phase upper port channel. The A-phase leakage detection lead-out wire passes through the zero-sequence current transformer and is welded to the A-phase leakage detection return wire.

5. The small assembled modular residual current circuit breaker according to claim 1, characterized in that, The opening part is a local opening structure arranged on the leakage protection housing.

6. The small assembled modular residual current circuit breaker according to claim 1, characterized in that, The leakage protection housing is a snap-cover structure, and the opening part is the opening side of the snap-cover structure.

7. The small assembled modular residual current circuit breaker according to claim 1, characterized in that, The leakage protection housing includes an assembled upper structure and a lower structure, and the opening part is the splicing interface between the upper structure and the lower structure.

8. The small assembled modular residual current circuit breaker according to claim 1, characterized in that, The leakage protection electronic circuit PCB board includes an upper PCB board and a lower PCB board stacked up and down, and the upper PCB board and the lower PCB board are welded together through a pin row.

9. The small assembled modular residual current operated circuit breaker according to claim 1, characterized in that, The upper port channel or the lower port channel is a groove opening to the outside, and a plug plate is arranged on the groove.

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