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Role of the circuit-breaker auxiliary contacts

Mar 24, 2017

Series in the operating circuit breaker auxiliary contact:
(1) the trip coil close coil manufacturers are designed according to the short-time power, after the jump, closing operation is completed through DL-contact control circuit automatically cut off in order to ensure the safety of jumps and closing coil;
(2) jump, closing the start circuit of contacts (contact hand operation, the relay contact) due to its breaking capacity restrictions, does not cut off the control circuit of the current well, if they disconnect the operating current will arc during the operation, resulting in contacts are burned. Auxiliary contacts disconnect the circuit breaker capacity, operated by auxiliary contacts disconnect the circuit breaker current can arc well, protect the control switch and relay contacts are burned to the ground.