Low-voltage circuit breaker

Abstract

The invention relates to a low-voltage circuit breaker. The technical problem of long arc duration caused by the secondary electron emission of the conventional low-voltage circuit breaker is solved. The low-voltage circuit breaker comprises a shell, an arc extinguish chamber, a moving contact terminal and a fixed contact terminal, wherein the arc extinguish chamber, the fixed contact terminal and the moving contact terminal are arranged in the shell. The low-voltage circuit breaker is characterized by also comprising a contact terminal cover, wherein the contact terminal cover mainly comprising a base part and a gas production part connected with the base part; at least the gas production part is made from a gas production material; the gas production part is opposite to a spacing between the moving contact terminal and the fixed contact terminal; when the gas production part produces a gas, an arc enters the arc extinguish chamber; and moreover, the gas production part faces a moving contact on the moving contact terminal.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a low-voltage circuit breaker. Background technique [0002] The low-voltage circuit breaker currently on the market consists of a housing, a moving contact, a static contact, a yoke, an arc striker, an arc extinguishing chamber, and an operating mechanism. When the low-voltage circuit breaker of this structure is broken, an arc will be formed between the contacts of the moving contact and the static contact. Objects damaged by arcing. However, under the action of the strong electric field between the two contacts, the low-voltage circuit breaker with this structure still has some positive ions moving to the contacts of the contacts at high speed during the arc extinguishing process, hitting the contact surface and ejecting electrons, resulting in The second emission of electrons makes the arc last longer; and the low-voltage circuit breaker with this structure only uses the magnetic field ...

AI Technical Summary

Problems solved by technology

However, under the action of the strong electric field between the two contacts, the low-voltage circuit breaker with this structure still has some positive ions moving to the contacts of the contacts at high speed during the arc extinguishing process, hitting the contact surface and ejecting electrons, resulting in The second emission of electrons makes the arc last longer; and the low-voltage circuit breaker with this structure only uses the magnetic field between the yoke and the arc plate to introduce the arc into the arc extinguishing chamber, the effect of arc ignition is not good, and the arc stays longer. Long, resulting in poor breaking capacity of low-voltage circuit breakers

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