Molded case circuit breaker

Abstract

The invention relates to a molded case circuit breaker. The molded case circuit breaker includes a surge protection module arranged in an upper cover and a power carrier module, wherein the surge protection module is arranged above a handle, the power carrier module is arranged at one side of the handle, the surge protection module and the power carrier module are respectively electrically connected with a wiring board, an A phase loop is provided with an A phase conductive copper bar, a B phase loop is provided with a B phase conductive copper bar, a C phase loop is provided with a C phase conductive copper bar, the A phase conductive copper bar, the B phase conductive copper bar and the C phase conductive copper bar are consistent in structure, one end of the A phase conductive copper bar is connected with a moving contact, the other end of the A phase conductive copper bar is connected with a wiring terminal, the A phase conductive copper bar is provided with a Z-shaped bending portion, and a current transformer is sleeved at the bending portion. The molded case circuit breaker is advantaged in that the size of the breaker is reduced through changing the structure of a conductive system, and the molded case circuit breaker has lightning protection and long distance carrier wave communication functions.

Description

technical field [0001] The invention relates to the low-voltage electric field, in particular to a molded case circuit breaker. Background technique [0002] Molded case circuit breakers can protect power lines and mechanical equipment in real time. When the lines and equipment are overloaded or short-circuited or undervoltage faults, they can automatically cut off the circuit. Molded case circuit breakers are usually installed in power distribution cabinets. One side of the circuit breaker is electrically connected to the busbar output by the transformer, and the other side of the molded case circuit breaker is electrically connected to the user's home line. [0003] The existing molded case circuit breakers have the following defects: 1. The structural design of the conductive system of the molded case circuit breaker is unreasonable, and the conductive system occupies a large internal space of the circuit breaker, so the molded case circuit breaker has large volume and po...

AI Technical Summary

Problems solved by technology

[0003] The existing molded case circuit breakers have the following defects: 1. The structural design of the conductive system of the molded case circuit breaker is unreasonable, and the conductive system occupies a large internal space of the circuit breaker, so the molded case circuit breaker has large volume and poor performance. Reliable defects; 2. When the power distribution cabinet is struck by lightning, the instantaneous ultra-high voltage generated by the lightning strike will not be grounded by the transformer for charge release, but will directly lead to the user's home, causing burnout and damage to the electrical appliances on the user's home side ; 3. Molded case circuit breakers lack the ability to communicate with terminal equipment, and cannot immediately determine the specific location of the fault when the line fails, which greatly increases the difficulty of maintenance

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