Auxiliary Contact: Contact with the circuit breaker main circuit, the mechanism of the mechanical connection, mainly for the display of the circuit breaker sub-state, and connected to the circuit breaker control circuit through the circuit breaker in the separation, the relevant electrical control or interlock. For example, to signal lights, relays and other output signals. Molded case circuit Breaker Shell class rated current 100A is a single breakpoint conversion contact, 225A and above for the bridge contact structure, the contracted heating current of 3 A, the Shell frame class rated current 400A and above can be installed two normally open, two normally closed, the contracted heating current of 6 a.
The number of operating performance is the same as the total operating performance of the circuit breaker. Alarm Contact: For the circuit breaker accident alarm contact, and this contact only when the circuit breaker tripping break only action, mainly for the load of the circuit breaker overload short-circuit or under-voltage and other faults, such as free tripping, alarm contact from the original normally open position into a closed position, the auxiliary line in the indicator or bell, buzzer, etc. Displays or alerts the fault tripping status of the circuit breaker. As the circuit breaker due to load failure and free tripping of the probability of not too much, so the life of the alarm contact is 1/10 of the circuit breaker life.
The operating current of the alarm contact is generally no more than 1A. Shunt tripping device: The shunt tripping device is a kind of tripping device which is excited by voltage source, and its voltage is independent of the main circuit voltage. The shunt tripping device is an accessory for remote control of the separation gate. The circuit breaker can be reliably divided when the supply voltage is equal to any voltage between 70%-110% of the rated control supply voltage. Shunt tripping device is a short-term work system, coil power-on time generally can not exceed 1S, otherwise the line will be burnt. Molded case circuit breaker to prevent the coil from burning, in the shunt tripping Coil Series A micro-switch, when the shunt tripping device through the armature suction, micro-switch from the normally closed state to the normally open, because the shunt off the power of the control line is cut off, even if the artificial hold the button, the shunt coil will never power this will avoid the formation of the coil burning loss. When the circuit breaker is closed again, the Microswitch is re-located in the NC position.