Description and classification of contacts

The contacts are important components of high voltage circuit breakers, switch cabinets, disconnectors, and earthing switches. Their performance directly affects the quality and service life of these high voltage electrical appliances.

In the high-voltage and ultra-high-voltage SF6 circuit breaker system, the arc contact currently used is mainly CuW alloy. The arc-arc contact in the past arc contact is a finger-spring structure. This structure is complicated and the spring works hot. Its use reliability is degraded.

As the core component of the medium and high voltage switchgear, the contact acts as a breaking and conducting function, and is widely used in various high voltage load switches, SF6 circuit breakers, on-load tap-changers, and large breaking capacity isolating switches and grounding switches. in.

The contacts are mainly divided into rivet type electrical contacts, powder metallurgy contacts, chip contacts and the like.

Rivet contacts are mainly used in various relays, contactors, small switches, thermostats, etc.

The chip contacts are mainly used in contactors, circuit breakers, thermostats, intelligent switches and the like.

Powder metallurgy contacts are mainly used in circuit breakers, line protection switches, fault current protection switches, leakage protection switches, sliding brushes, etc.

The materials of the contacts mainly include Ag, FAg, AgNi, AgSnO2, AgCdO and the like.