Which parts of the miniature circuit breaker trip are made, under which circumstances
Auxiliary contacts (auxiliary switches) - set according to the combination of control electromagnets and other auxiliary circuit appliances. At present, more are used micro-switches with heating current (Ith) 3A and 6A.
Alarm contact (alarm switch) - Reflects that the circuit breaker is turned on due to line fault (overload, short circuit) and sounds, light alarm, its heating current is small, generally less than 3A or lower.
Shunt release - a tripping device for long-distance operation to trip the circuit breaker. Its control voltage is AC 380V (400V), 220V (230V), DC 220V, 110V, 24V, etc.
Undervoltage release - A tripping device that prevents damage to the line or motor due to insufficient line voltage. It is the same as the line voltage. It usually has AC 380V (400V), 220 (230V), DC 110V, 220V, etc.
2, external accessories
External rotation handle - suitable for circuit breakers on the switchgear or drawer cabinet door panel, split circuit breaker, can play the interlocking function, the complete electrical equipment can only open the door when the power is off.
The electric operating mechanism is composed of an electromagnet or a motor, and can be remotely controlled instead of a manual closing () or an open (OFF) circuit breaker. Mechanical interlocking, self-locking.
3, miniature circuit breaker standard
Miniature circuit breakers developed, developed and applied in China Miniature circuit breaker protection type circuit breakers comply with GB1963 (equivalent to IEC898) household and similar household places overcurrent protection circuit breakers. The residual current protection type circuit breaker (leakage circuit breaker) shall comply with GB6829, GB16917IEC100) and EC755 standards.