Magnetic ring primary winding loop of 125A small residual-current circuit breaker

Abstract

A 125A small residual current circuit breaker magnet ring primary winding loop comprises a current transformer and a current conductor penetrating through the current transformer, one end of the current conductor is electrically connected with a wiring board of a wiring terminal, and the other end of the current conductor is electrically connected with an air switch coil of an air switch module. The design of a wiring board connected with the air switch module is omitted, use of a fastening mechanism is omitted, the production cost is reduced, the current conductor and the air switch are directly welded and fixed, the production process is simplified, the current transformer is penetrated after welding, damage to the current transformer is reduced, and the service life of the current transformer is prolonged. Meanwhile, the temperature rise performance of the joint of the two parts is improved through welding and fixing.

Description

Technical Field

[0001] The utility model specifically relates to a primary winding circuit of a magnetic ring of a 125A small leakage circuit breaker. Background Art

[0002] Existing multi-pole leakage circuit breakers are assembled horizontally by multi-stage circuit breaker units and leakage circuit breaker modules. For example, the Vigi C120 leakage circuit breaker of Schneider, and there is also an up-and-down splicing assembly, such as the Changshu CH3LH-125 leakage circuit breaker. Among them, a leakage breaking mechanism, a leakage tripping mechanism and a zero-sequence current transformer are sequentially installed horizontally in the leakage circuit breaker module.

[0003] The splicing connection method causes one end of the primary winding of the magnetic ring circuit inside it to be electrically connected to the wiring terminal, and a connecting plate needs to be set at the other end, and it is connected to the multi-stage circuit breaker unit through a fastening mechanism.

[0004] For example, in the Chinese patent CN 215496602 U applied by the applicant himself, it discloses a leakage circuit breaker, which specifically discloses that a first conductive plate 320 connected to a phase current-carrying member is provided on a current transformer module 3, and second conductive plates 25 are correspondingly provided on a circuit breaker module 1 and a leakage tripping device module 2. The fastener 4 can be a conventional fastening screw. Threaded connection holes are opened on both the first conductive plate 320 and the second conductive plate 25, and the fastening screw passes through the threaded connection holes on the first conductive plate 320 and the second conductive plate 25 and is fixed together. That is, one end of the primary winding of the magnetic ring circuit needs to be firmly connected through two conductive plates. Due to the existence of the two conductive plates, there is a possibility of temperature rise at this place. At the same time, the use of multiple conductive plates will increase the product cost. Summary of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a primary winding circuit of a magnetic ring of a 125A small leakage circuit breaker.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A primary winding circuit of a magnetic ring of a 125A small leakage circuit breaker, which includes a current transformer and a current conductor passing through the current transformer. One end of the current conductor is electrically connected to a wiring board of a wiring terminal, and the other end of the current conductor is electrically connected to an air switch coil of an air switch module.

[0008] The current conductor is a PE wire.

[0009] The current conductor is a metal row.

[0010] The current conductor is electrically connected to the air switch coil through a spot welding process.

[0011] The current conductor and the terminal block are electrically connected by spot welding process.

[0012] Advantages of the utility model: This application eliminates the design of the terminal block for connecting to the air switch module, thereby eliminating the use of fastening mechanisms, reducing production costs, directly welding and fixing the current conductor to the air switch, simplifying the production process, realizing welding first and then passing through the current transformer, reducing damage to the current transformer, and at the same time, welding and fixing improves the temperature rise performance at the connection between the two. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the utility model applied to a small leakage circuit breaker.

[0014] Figure 2 It is a schematic structural diagram of the utility model. Detailed Embodiments

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0017] As shown in the figure, the present utility model discloses a magnetic ring primary winding circuit for a 125A small leakage circuit breaker, which is mainly applied to a 125A small leakage circuit breaker. There is a chamber in the circuit breaker for installing the magnetic ring primary winding circuit.

[0018] Furthermore, it includes a current transformer 3 and a current conductor 1 passing through the current transformer. One end of the current conductor is electrically connected to the terminal block 2 of the wiring terminal, and the other end of the current conductor is electrically connected to the air switch coil 4 of the air switch module. Specifically, the current conductor and the terminal block are welded and fixed on the side close to the current transformer, and this welding can be spot welding. Specifically, the other end of the current conductor passes through the housing of the air switch module and enters its interior, and is directly welded and fixed to the internal air switch coil, and this welding can be spot welding.

[0019] By using the spot welding process, the current conductor can be processed first, so that it can be spot-welded to the circuit breaker coil and then passed through the current transformer. This can avoid the previous method of using a connecting plate, which requires passing the connecting plate through the current transformer, thereby avoiding damage to the current transformer.

[0020] At the same time, the spot welding connection between the circuit breaker coil and the current conductor can directly carry out automated production of the component, and then the connection between the two can be completed directly before assembly, which can improve production efficiency. Secondly, spot welding fixation prevents the joint between the two from having cold welding and other phenomena, thereby reducing the defective rate.

[0021] The current conductor is a PE conductor. By utilizing the flexible and bendable properties of the PE conductor, the angle of the PE conductor can be adjusted so that the conductor can be better welded and fixed to each terminal.

[0022] Specifically, the current conductor may also be a metal bar, which may be a copper bar, and when in use, the connection between the corresponding air switch module and the wiring terminal is achieved through multiple bending.

[0023] At the same time, the magnetic ring primary winding circuit proposed in the present application directly connects the terminal block of the terminal block and the circuit breaker coil. Compared with the magnetic ring primary winding circuit that previously adopted a fastening mechanism, the present application omits the structure of the connection between it and the circuit breaker module, such as the conductive plates that cooperate with each other and the fastening mechanism that locks the conductive plates, thereby saving parts costs and improving temperature rise performance.

[0024] The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A 125A small leakage circuit breaker magnetic ring primary winding circuit, characterized in that: It comprises a current transformer and a current conductor passing through the current transformer, one end of the current conductor is electrically connected to a wiring board of a wiring terminal, and the other end of the current conductor is electrically connected to an air switch coil of an air switch module.

2. The 125A small leakage circuit breaker magnetic ring primary winding circuit according to claim 1, characterized in that: The current conductor is a PE conductor.

3. The 125A small leakage circuit breaker magnetic ring primary winding circuit according to claim 1, characterized in that: The current conductor is a metal bar.

4. A 125A small leakage circuit breaker magnetic ring primary winding circuit according to claim 1, 2 or 3, characterized in that: The current conductor is electrically connected to the open coil by a spot welding process.

5. A 125A small leakage circuit breaker magnetic ring primary winding circuit according to claim 1, 2 or 3, characterized in that: The current conductor is electrically connected to the terminal plate by a spot welding process.

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