Circuit breaker moving contact with arc contact

Abstract

The invention relates to the technical field of circuit breakers, and especially discloses circuit breaker moving contact with an arc contact. The circuit breaker moving contact comprises a contact system, a contact support, contact springs, a connecting shaft and a flexible connector, wherein the contact system comprises a plurality of contact pieces, the contact pieces are all sleeved on the connecting shaft, the end parts, which are located at two sides of the connecting shaft, of each contact piece are respectively a butt joint end abutted against the contact spring and a connecting end connected with the flexible connector, the side edge of each connecting end is provided with a limiting rod for the butt joint of the connecting end, the middle part of the limiting rod is provided witha concave cavity, the bottom surface of the concave cavity is lower than the surface of the other positions of the limiting rod, the connecting end of at least one contact piece is in butt joint withthe bottom surface of the concave cavity to form an arc contact, the other contact pieces form a main contact, and the butt joint end of the arc contact protrudes out of the butt joint end of the main contact. By adopting the structure, the circuit breaker moving contact with the arc contact which can effectively protect the main contact and can provide reliable high breaking capacity and long electric service life under high voltage.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a moving contact structure of a circuit breaker. Background technique [0002] At present, the moving contacts of circuit breakers generally include contact supports, rotating shafts, bottom brackets, contact springs, contact sheets, soft connections, moving contact busbars and contact covers. The head side plate, the rotating shaft is located between the two contact side plates. The flexible connection electrically connects the contact piece and the moving contact busbar, the moving contact busbar is fixed on the bottom bracket, and the bottom bracket is fixed on the circuit breaker base. The lower end of the contact side plate is rotatably clamped on the bottom bracket, the moving contact busbar is fixed on the bottom bracket, the contact piece is sleeved on the rotating shaft, and the contact cover is covered on the front of the moving contact. [0003] After the sh...

AI Technical Summary

Problems solved by technology

[0003] After the circuit breaker has completed the circuit breaker short-circuit breaking test or electrical life, the silver spots on the moving contacts cause serious arc burn and corrosion, which affects the subsequent post-test verification, and also makes it difficult to improve the short-circuit breaking capacity of the circuit breaker

To solve this problem, on the one hand, start with the material of the silver dots to make the silver dots more wear-resistant and anti-ablation, which will greatly increase the cost

On the other hand, increase the opening distance between the dynamic and static contacts, but it is very difficult to implement for the limited volume and compact circuit breaker products

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