Arc striking and arc running structure

Abstract

The invention relates to the field of a low-voltage electrical appliance, in particular to an arc striking and arc running structure. The arc striking and arc running structure comprises a static arcrunning way, a movable arc running way, an upper pole plate and a lower pole plate, wherein the static arc running way is connected with a static contact, the movable arc running way is matched with amovable contact, the upper pole plate and the lower pole plate are arranged in parallel, the distance between the upper pole plate and the lower pole plate is d, the static arc running way is arranged between the upper pole plate and the lower pole plate and is arranged opposite to the movable arc running way, the static arc running way comprises a static arc running way arc part, the static arcrunning way arc part protrudes towards the movable arc running way and is connected with the static arc running way, the movable contact is arranged at maximum opening distance, a tangential line is led from a tail end of the movable contact to the static arc running way arc part, the tangential line and the static arc running way arc part are tangent at a tangential point b, the distance betweenthe tail end of the movable contact and the tangential point b is r, a circle C0 is made by taking the tangential point b as a circle center and r as radius, the circle C0 and the movable arc runningway intersects at a point e, the vertical distance between the point e and the lower pole plate is d1, and d1 is smaller than or equal to d fourth. By the arc striking and arc running structure, rapidjump of an arc is achieved, and serious ablation of the arc to an arc extinguishing chamber is prevented.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to an arc striking and arc running structure. Background technique [0002] In the existing switching devices, such as miniature circuit breakers, the fault current is usually broken by breaking the contacts and extinguishing the arc. The arc extinguishing process of the miniature circuit breaker mainly includes the following stages: the contacts are opened to generate arcs, Arc elongation and jumping, arc running, arc burning and arc extinguishing in the arc extinguishing chamber, among which, the process of arc jumping and arc running is crucial to the breaking of the entire fault current. [0003] The existing arc striking and arc running structure, in the process of breaking the fault current, the jumping of the arc is difficult, and the current limiting ability of the short circuit current is insufficient, so that the energy of the arc in the breaking process is...

AI Technical Summary

Problems solved by technology

[0003] The existing arc striking and arc running structure, in the process of breaking the fault current, the jumping of the arc is difficult, and the current limiting ability of the short circuit current is insufficient, so that the energy of the arc in the breaking process is high, and it is easy to damage the arc extinguishing chamber. severe ablation

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