Spring Return Switches provide contacts that are held closed only when the switch is turned against the mechanism spring. The mechanism returning the contacts to their original state upon release of the actuator.
This type of switches are known as ''Momentary switches''.
TNC switch is a three position switch when it is in close position it put the circuit breaker in operation by energizing the closing coil and when it is in a trip position it will trip the circuit by energizing the trip coil in the circuit breaker.
The Wide range of Rish Rotary CAM switches cover most application with different contact design, contact material and terminals allow their use as control switches, instrumentation switches , motor control switches and Electronic circuitory.