Molded case earth leakage circuit breaker

Abstract

The invention discloses a molded case earth leakage circuit breaker, which can more quickly lead electric arcs and arcing into an arc-extinguishing cover so as to improve the breaking ability of the circuit breaker. The molded case earth leakage circuit breaker comprises a wiring terminal, an operating mechanism, a heat element and a moving contact which are all arranged on a base; a transformer is electrically connected with a circuit breaker; an arc extinguishing chamber is arranged on the base; the arc-extinguishing cover is inserted in the arc extinguishing chamber; the arc-extinguishing cover comprises side plates and a plurality of arc-extinguishing grid plates; the arc-extinguishing grid plates are fixed on oppositely-arranged side plates; the arc-extinguishing grid plates are arranged at intervals along the height direction of the side plate; a static contact is fixedly connected with the base; the static contact comprises a static contact arm and a contact; an arc-starting pin electrically connected with the arc-extinguishing grid plate located at the bottom is arranged on the arc-extinguishing grid plate; the arc-starting pin extends out towards the oblique downward direction; and the end part of the arc-starting pin is closer to the contact of the static contact than the root part of the arc-starting pin.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a plastic shell type leakage protection circuit breaker. Background technique [0002] At present, the plastic shell leakage protection circuit breakers on the market include bases, operating mechanisms, heating elements, transformers, circuit boards, live wire terminals, neutral wire terminals, arc extinguishing covers, live wire moving contacts, and neutral line moving contacts. contacts and static contacts. Among them, the arc chute consists of two side plates and several grid pieces. Each grid piece is roughly U-shaped, and the grid pieces are fixed on the opposite side plates at an oblique angle. The grid pieces are arranged in sequence along the height direction of the side plates, and the bottommost grid piece has a grid foot. The arc extinguishing cover is installed on the base, the grid foot is located on the static contact and an insulating pad ma...

AI Technical Summary

Problems solved by technology

[0003] 1. In the traditional structure, the wires are fastened by screws. Because the screws are loose during use, there is a gap between the connections of the wire harnesses that make up the wires. After the power is turned on, the temperature of the wires will rise and mistaken for overload

[0004] 2. There are many electronic components welded on the circuit board, which inevitably generates a certain magnetic field. Since the circuit board is installed adjacent to the transformer, the magnetic field can interfere with the transformer, resulting in malfunction of the circuit breaker

[0005] 3. The distribution of parts is unreasonable, so that the space on the base cannot be fully utilized, resulting in a larger overall size and increased manufacturing costs

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