Residual current operated circuit breaker

Abstract

The invention discloses a residual current operated circuit breaker, which comprises a base and a cover plate. A concave cavity is formed in one side of the base; the electric leakage protection module comprises a zero sequence mutual inductor and a tripping mechanism. The tripping mechanism comprises a tripping coil, the zero sequence mutual inductor comprises a magnetic ring and a secondary winding. A first wire and a second wire are further included and matched with the magnetic ring in a penetrating mode. The tripping coil comprises a coil framework and a coil winding; a circuit board is connected between the secondary winding and the tripping coil; the first wire and the second wire are both wound on the zero sequence mutual inductor and penetrate through an inner hole of the zero sequence mutual inductor at least twice, a plurality of discrete components used for achieving filtering of output signals of the mutual inductor and switching devices are arranged on the circuit board,and the secondary winding and the tripping coil are electrically connected through the discrete components. The device is convenient to install, the existing product structure can be simplified, and the product weight and the production cost are reduced.

Description

technical field [0001] The invention relates to a residual current operated circuit breaker. Background technique [0002] The residual current operated circuit breaker is a circuit breaker with leakage protection function. Its shell is generally composed of a base and a cover plate. There are concave cavities on both sides of the base. The cover plate can seal the cavity. It accommodates the leakage protection module and the circuit breaker module. The leakage protection module includes internal components such as zero-sequence transformer, tripping mechanism, circuit board, moving and static contacts, and arc extinguishing chamber. Some of the internal components include tension springs, moving contacts Heads, connecting rods, swing rods, etc. need to be positioned or rotated through shafts. One end of these shafts is inserted and fixed on the base, and the other end is inserted and fixed on the fixed plate connected to the base. The cover plate The inner side is usually ...

AI Technical Summary

Problems solved by technology

[0004] (1) The production or purchase cost of the circuit board is relatively high, and the volume is relatively large, which occupies more space inside the housing, which is not conducive to the miniaturization and compactness of the overall structure of the product, and the sensitivity and reliability are also poor;

[0005] (2) The tripping coil and the circuit board are independent of each other. During assembly, the two need to be installed separately, and the tripping coil and the circuit board need to be electrically connected through wires, which not only occupies a lot of space inside the housing space, and it is easy to shake, which is not conducive to the cover assembly between the base and the cover;

[0006] (3) The spring in the tripping coil lacks an effective positioning structure, and it is easy to come out during the closing process of the cover plate, which is inconvenient to assemble;

[0007] (4) The other end of the shaft needs to be fixed by a fixing plate, and the setting of the fixing plate will bring about the problems of increasing the overall volume of the product, increasing the weight, increasing the cost, and increasing the production process;

[0008] (5) The moving contact piece and the static contact piece of the test device are easy to contact with the circuit board during use, resulting in a short circuit and affecting the test function

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