Contact wrapping type arc striking structure and contact mechanism

Abstract

The invention discloses a contact wrapping type arc striking structure and a contact mechanism. The structure is characterized in that an end tab matched with the structure of the contact plate is fixed on the contact plate, the end tab is made of ferromagnetic materials, a wrapping opening is formed in the end tab, and the contact is correspondingly arranged on the inner side of the wrapping opening. The structure has the advantages that the contact is arranged on the inner side of the wrapping opening, so that the contact is wrapped by the arc striking plate, the periphery of the contact isprotected by magnetic field force, an electric arc can be pushed away under the action of a magnetic field, the contact is protected, the electric arc damage is reduced, the arc striking plate is matched with the contact plate in structure, and the arc striking plate can be flush with a contact angle as much as possible. Therefore, the arc curve is prevented from moving, the arc can smoothly movealong the end tab, the arc is rapidly led into the arc extinguishing device, the breaking index of the circuit breaker is effectively improved, and the electrified service life of the contact is effectively prolonged.

Description

technical field [0001] The invention relates to an arc extinguishing and arc starting device of a circuit breaker, in particular to a contact wrapping type arc starting structure and a contact mechanism. Background technique [0002] When the moving and static contacts in the circuit breaker are separated due to a fault such as a short circuit in the circuit, an arc will be generated between the moving and static contacts, which delays the opening time of the switch, reduces the breaking performance of the switch, and even causes the circuit breaker to break. The load and circuit breaker components in the battery are severely burned. [0003] Therefore, in the contact mechanism, an arc strike structure is often provided, so that the arc generated when the moving and static contacts are separated can be quickly and smoothly introduced into the grid arc extinguishing chamber and extinguished. [0004] However, the existing arc striking device is either bulky, takes up space, ...

AI Technical Summary

Problems solved by technology

[0004] However, the existing arc striking device is either bulky, takes up space, and the effect of arc striking is not good, resulting in the residence time of the arc in the moving contact and the static contact being too long, thus easily causing contact burnout

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