Neutral pole structure of miniature circuit breaker

Abstract

The invention discloses a neutral pole structure of a small circuit breaker, which includes an incoming line terminal (15) and an outgoing line terminal (14), which are respectively located at two ends of a circuit breaker bottom case (16); an opening and closing operating mechanism, which It includes a moving contact (8) and a static contact (7) for breaking the line; it also includes a circuit board (13), and the two ends of the circuit board (13) are respectively fixedly connected to the bottom case (16) and On the upper cover, which is close to the side wall of the bottom case (16), the board surface of the circuit board (13) is vertically arranged with the bottom case and / or the upper cover; the neutral pole of the circuit breaker is also Including an arc extinguishing chamber (11), the arc extinguishing chamber (11) is placed at the lower part of the bottom case (16), and its arc extinguishing grid extends close to the moving contact (8) and the static contact (7) direction setting. This structure solves the problem that the neutral pole arc extinguishing effect of the miniature circuit breaker in the prior art is poor, resulting in poor short-circuit breaking capacity.

Description

technical field [0001] The invention belongs to the field of low-voltage electrical appliances, in particular to a neutral pole structure of a small circuit breaker. Background technique [0002] The structure of the neutral pole of the existing miniature circuit breaker is limited by the space, and the neutral pole is not equipped with an arc extinguishing chamber, and the arc extinguishing performance is poor, resulting in poor short-circuit breaking capacity and severe burning of the moving contact of the neutral pole by the arc . [0003] Chinese patent CN2541948Y discloses a small circuit breaker. The N-pole circuit breaker includes an electronic circuit board placed at the bottom of the base, a handle, a push rod assembly, a moving contact, a static contact, a lock, a jumper, and the like. The base and the top cover form the shell of the miniature circuit breaker. The push rod assembly is connected with the handle, and the push rod assembly can push the moving contac...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the space utilization of the neutral pole of the miniature circuit breaker in the prior art is unreasonable, resulting in the inability to place the arc extinguishing device, resulting in poor arc extinguishing effect and poor short-circuit breaking capacity

Images