125A small residual-current circuit breaker

Abstract

A 125A small residual-current circuit breaker comprises a plurality of air switch modules which are arranged side by side and a residual-current release module which is arranged side by side with the air switch modules, one end of each of the air switch modules and the residual-current release module is provided with an installation cavity which is composed of a base and an upper cover, and the base is also internally provided with a middle cover which is used for fixing a wiring terminal. A magnetic ring loop is arranged between the wiring terminal and the air switch module, one end of the magnetic ring loop is electrically connected with the wiring terminal, and the other end of the magnetic ring loop is electrically connected with an air switch coil in the air switch module. Through the design of the base and the upper cover, the lengths of the air switch and the electric leakage tripper are prolonged, the integrated structural design is realized, the risk of unreliable connection caused by splicing is eliminated, meanwhile, the magnetic ring loop is directly arranged in the mounting cavity, and the magnetic ring loop is directly connected with an air switch coil in the air switch of the wiring terminal box, so that the reliability of the wiring terminal box is improved. An additional fastening mechanism is omitted, temperature rise points are reduced, and the product safety is higher.

Description

Technical Field

[0001] The utility model specifically relates to a 125A small leakage circuit breaker. Background Art

[0002] The existing multi-pole leakage circuit breakers are assembled horizontally through multi-stage circuit breaker units and leakage circuit breaker modules, such as Schneider's Vigi C120 leakage circuit breaker, and also assembled up and down, such as Changshu CH3LH-125 leakage circuit breaker, in which the leakage circuit breaker module is horizontally installed with a leakage circuit breaker mechanism, a leakage tripping mechanism and a zero-sequence transformer.

[0003] However, the splicing connection method has risks in terms of connection reliability. At the same time, due to the use of additional fastening mechanisms, the temperature rise at the connection will be high, affecting safety and reliability. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a 125A small leakage circuit breaker.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A 125A small leakage circuit breaker comprises a plurality of air switch modules arranged side by side and leakage release modules arranged side by side with the air switch modules, and one end of the air switch module and the leakage release module is provided with an installation chamber consisting of a base and an upper cover, a middle cover for fixing a wiring terminal is also provided in the base, and a magnetic ring loop is provided between the wiring terminal and the air switch module, and one end of the magnetic ring loop is electrically connected to the wiring terminal, and the other end is electrically connected to the air switch coil inside the air switch module.

[0007] One end of the shell of the combined air switch module and leakage release module is provided with a mounting surface matched with the base, and the rear side of the base extends toward the shell to form a mounting plate that can be fixedly arranged on the mounting surface.

[0008] The mounting plate is provided with a plurality of limiting holes at intervals along the width direction.

[0009] The limiting hole is in a strip shape.

[0010] The mounting surface is provided with a limiting boss matched with the limiting hole.

[0011] A plurality of buckles are also arranged on the inner side of the mounting surface.

[0012] The front end of the base is provided with a plurality of mounting grooves for fixing the wiring terminals.

[0013] A plurality of heat dissipation holes are arranged in the installation groove.

[0014] The base and the upper cover are respectively fixedly connected to the housings of the air switch module and the leakage tripping device module through pins.

[0015] Advantages of the present utility model: Through the design of the base and the upper cover, the lengths of the air switch and the leakage tripping device are extended to achieve an integrated structural design, eliminating the risk of unreliable connection caused by splicing. At the same time, the magnetic ring circuit is directly arranged in the installation chamber, and the magnetic ring circuit is directly connected to the air switch coil inside the air switch of the terminal box, eliminating the need for additional fastening mechanisms and reducing the temperature rise points, making the product safer. Brief Description of the Drawings

[0016] Figure 1 It is a structural schematic diagram of the present utility model.

[0017] Figure 2 It is a structural schematic diagram of the present utility model (with the upper cover omitted).

[0018] Figure 3 It is a top view of the present utility model (with the upper cover omitted).

[0019] Figure 4 It is a structural schematic diagram of the installation surface of the present utility model.

[0020] Figure 5 It is a structural schematic diagram of the base of the present utility model. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying 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 the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] It should be noted that all the 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.

[0023] As shown in the figure, the utility model discloses a 125A miniature residual current circuit breaker, which includes a plurality of air switch modules 1 arranged side by side and a leakage tripping device module 2 arranged side by side with the air switch module. Each module is provided with an independent housing, and each module is arranged side by side with each other. Its width is determined by the number of air switch modules arranged side by side and the width of the leakage tripping device module. One end of the air switch module and the leakage tripping device module is provided with an installation chamber composed of a base 3 and an upper cover 4. The base and the upper cover can be riveted and fixed by passing pins through the air switch modules and the leakage tripping device modules arranged side by side, so that the whole is in an integrated structure, eliminating the splicing point and reducing the occurrence probability of fault points.

[0024] At the same time, the bottom of one end of the air switch module and the leakage tripping device module arranged side by side is provided with an installation surface, which is used to cooperate with the installation plate at the bottom of the base, so as to make the two better connected.

[0025] A middle cover 5 for fixing the wiring terminal is also arranged in the base. A magnetic ring circuit 7 is arranged between the wiring terminal and the air switch module. One end of the magnetic ring circuit is electrically connected to the wiring terminal 6, and the other end is respectively electrically connected to the air switch coil inside the air switch module.

[0026] The magnetic ring circuit directly connects the wiring terminal and the air switch coil. Compared with the previous splicing method, it eliminates the fastening mechanism for connecting the magnetic ring circuit and the air switch module, thereby avoiding the temperature rise between the wiring boards fastened by the fastening mechanism. At the same time, the design of the wiring terminal at one end of the air switch module is eliminated. Only an inlet 11 needs to be set on the housing of the air switch module. The wire of the magnetic ring circuit directly enters the housing through the inlet and is welded and fixed to the internal air switch coil, reducing the process difficulty, making the magnetic ring circuit simpler and the installation more convenient.

[0027] One end of the housing of the combined air switch module and the leakage tripping device module is provided with an installation surface 8 adapted to the base. The rear side of the base extends towards the housing direction to form an installation plate that can be fixedly arranged on the installation surface. The installation plate is slightly higher than the bottom surface of the base. When the installation plate is placed on the installation surface, the installation surface covers the entire installation plate, and the bottom surface of the entire circuit breaker forms a complete surface.

[0028] A plurality of limiting holes 32 are arranged at intervals along the width direction of the installation plate 39. The width direction is the same as the width direction of the air switch module. The limiting holes are strip-shaped. Limiting bosses 10 adapted to the limiting holes are arranged on the installation surface. Through the cooperation of the limiting bosses and the limiting holes, the extrusion of the internal space of the installation chamber is reduced. At the same time, since the primary circuit of the magnetic ring circuit of 125A occupies a large space, the cooperation of the limiting bosses and the limiting holes can also reduce the installation difficulty between the base and the housing. The fixation of the two can be completed simply by snapping, which is convenient for subsequent riveting and fixing.

[0029] On the inner side of the installation surface, several buckles 9 are also provided. The design of the buckles is to limit the installation plate to closely adhere to the installation surface, reduce the gap between the two, improve the electrical performance. At the same time, a notch 33 is provided at the mating part of the installation plate. The installation plate and the installation surface are mated by embedding through the notch direction and clamping to one side, reducing the installation difficulty.

[0030] At the front end of the base, several installation grooves 31 for fixing the terminal blocks 6 are provided. The terminal blocks are pressed by the middle cover in each installation groove, and a limiting structure 34 for limiting the wiring board of the terminal block is provided on the side wall of each installation groove. The limiting structure is a convex portion arranged oppositely, and a limiting space matching the front end of the wiring board is formed between the front end surface of the convex portion and the front side wall of the installation groove.

[0031] At the same time, several supporting ribs 36 are provided at the bottom of the installation groove for supporting the wiring frame of the terminal block, so that it always remains in place.

[0032] Several heat dissipation holes 37 are provided in the installation groove, and the heat dissipation holes are arranged between the respective supporting ribs. Since the temperature rise of 125A is relatively large, several heat dissipation holes are provided for heat dissipation. The design of the heat dissipation holes here can greatly reduce the temperature rise at the terminal block.

[0033] The base and the upper cover are respectively fixedly connected to the shells of the air switch module and the leakage tripping module through pins. After the pins pass through the whole, they are fixed by press riveting, so as to form an integrated design.

[0034] The air switch module and the leakage tripping module can be spliced first, then the base is mated with the installation surface, then the middle cover and the upper cover are installed in sequence, and finally the three modules are fixed by inserting fasteners such as pins into the connection holes.

[0035] The middle cover is fixedly arranged on the base, and the middle cover and the base are fixedly connected by screws. At the same time, an inverted buckle 35 is provided at the position where the base is mated with it, and a bayonet is correspondingly provided on the middle cover, and the two form a snap-fit. The snap-fit design can rely on this fit to fix the terminal block during installation, so as to prevent the middle cover from falling off when locking the screws.

[0036] On the inner sides of the two side walls of the base, inner side walls 38 extending towards the shell are provided. When the base is mated with the shell, the inner side walls are placed inside the side walls of the shell, thereby sealing the gap at the connection between the base and the shell.

[0037] In this application, by providing an installation chamber at the front end of the air switch and the leakage tripping module, the width of the two is not changed, and only a space for placing the magnetic ring circuit is increased in length. Compared with the previous splicing structure, it can ensure the design of the minimum size.

[0038] The embodiments should not be regarded as limitations to the present utility model, but any improvements made based on the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A 125A miniature residual current circuit breaker, characterized in that: It includes a number of air switch modules arranged side by side and a leakage tripping device module arranged side by side with the air switch modules. One end of the air switch modules and the leakage tripping device module is provided with an installation chamber composed of a base and an upper cover. A middle cover for fixing wiring terminals is also provided in the base. A magnetic ring circuit is arranged between the wiring terminals and the air switch modules. One end of the magnetic ring circuit is electrically connected to the wiring terminals, and the other end is respectively electrically connected to the air switch coils inside the air switch modules.

2. The miniature residual current circuit breaker of 125A according to claim 1, characterized in that: One end of the housing of the combined air switch modules and the leakage tripping device module is provided with an installation surface adapted to the base. The rear side of the base extends towards the housing direction to form an installation plate that can be fixedly arranged on the installation surface.

3. A 125A miniature residual current circuit breaker according to claim 2, characterized in that: A number of limiting holes are arranged at intervals along the width direction of the installation plate.

4. A 125A small leakage circuit breaker according to claim 3, characterized in that: The limiting holes are strip-shaped.

5. A 125A miniature residual current circuit breaker according to claim 3 or 4, characterized in that: Limiting bosses adapted to the limiting holes are provided on the installation surface.

6. A 125A miniature residual current circuit breaker according to claim 2, characterized in that: A number of buckles are also provided inside the installation surface.

7. A 125A small leakage circuit breaker according to claim 1, characterized in that: A number of installation grooves for fixing wiring terminals are provided at the front end of the base.

8. A 125A miniature residual current circuit breaker according to claim 7, characterized in that: A number of heat dissipation holes are provided in the installation grooves.

9. A 125A miniature residual current circuit breaker according to claim 1, characterized in that: The base and the upper cover are respectively fixedly connected to the housings of the air switch modules and the leakage tripping device module through pins.

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