Moulded case circuit breaker with grounding

Abstract

The invention relates to a moulded case circuit breaker with grounding. The moulded case circuit breaker with grounding includes a base, a middle seat and an upper cover which are sequentially arranged, wherein the base is mounted on a guide rail, the middle seat is provided with a wiring board, one side of the wiring board is provided with a grounding sheet, a positioning groove is formed on themiddle seat, one end of the grounding sheet is electrically connected with the wiring board, the other end of the grounding sheet is arranged in the positioning groove, a grounding hole penetrating through the middle seat and the base is formed below the positioning groove, the other end of the grounding sheet is provided with a grounding screw, the grounding screw sequentially penetrates throughthe grounding sheet and the grounding hole and is then fixed on the guide rail, and the guide rail is connected with the ground. The moulded case circuit breaker is advantaged in that self grounding protection can be achieved, the instantaneous current generated by the lightning strike is introduced into the earth, damage to the molded case circuit breaker itself is avoided, moreover, user's homeappliances are protected from being affected, and a protective grounding mounting mode is simple and convenient.

Description

technical field [0001] The invention relates to a molded case circuit breaker, in particular to a grounded molded case circuit breaker. Background technique [0002] The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting, so as to realize the circuit over-current and short-circuit protection. Molded case circuit breakers are usually installed in power distribution cabinets. Most of the existing molded case circuit breakers are not equipped with grounding wires. One side of the molded case circuit breaker is electrically connected to the busbar output by the transformer. The other side is electrically connected to the user's home line. Although the transformer is equipped with grounding protection, the grounding of the transformer is unstable, and the distance from the transformer to the molded case circuit breaker is usually much greater than the distance from the molded case circuit breaker to the user's home. When ...

AI Technical Summary

Problems solved by technology

Molded case circuit breakers are usually installed in power distribution cabinets. Most of the existing molded case circuit breakers are not equipped with grounding wires. One side of the molded case circuit breaker is electrically connected to the busbar output by the transformer. The other side is electrically connected to the user's home line. Although the transformer is equipped with grounding protection, the grounding of the transformer is unstable, and the distance from the transformer to the molded case circuit breaker is usually much greater than the distance from the molded case circuit breaker to the user's home. When the current of the circuit breaker far exceeds its rated current, for example, the line is short-circuited or the power distribution cabinet is struck by lightning, the instantaneous current generated cannot be directly connected to the ground, which will not only affect the electrical appliances of subsequent users, but even cause serious safety hazards in the power distribution cabinet. ACCIDENT

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