1. Overview of switch accessories
Auxiliary contact: contact mechanically linked with the opening and closing mechanism of the main circuit of the circuit breaker, mainly used for displaying the opening and closing state of the circuit breaker, connected to the control circuit of the circuit breaker through the opening and closing of the circuit breaker, to its Relevant electrical appliances are controlled or interlocked.For example, output signals to signal lamps, relays, etc.Molded case circuit breaker frame rated current 100A is a single-break changeover contact, 225A and above is a bridge contact structure, and the agreed heating current is 3A; frame rated current 400A and above can be equipped with two normally open and two normally open Closed, the agreed heating current is 6A.The number of operating performances is the same as the total number of operating performances of the circuit breaker.
Alarm contact: the alarm contact used for circuit breaker accidents, and this contact will only act when the circuit breaker is tripped and broken. It is mainly used for free tripping and alarm when the load of the circuit breaker has overload, short circuit or undervoltage faults. The contact is converted from the original normally open position to the closed position, and the indicator light, electric bell, buzzer, etc. in the auxiliary circuit are connected to display or remind the fault tripping state of the circuit breaker.Since the probability of free tripping of the circuit breaker due to load failure is not too much, the life of the alarm contact is 1/10 of the life of the circuit breaker.The working current of the alarm contact generally does not exceed 1A.
