Circuit breaker Part 10: Operation and Control Part 2

Limit switch:

The limit switch is monitoring the closing spring charging status.

Auxiliary contacts:

Auxiliary contacts are contacts that show the circuit breaker position.

At least one contact is used in each control circuit (trip/close) to control the coil supply. Contacts not used in control circuits are normally connected to terminals for customer use.

Impulse contact / Wiping contact:

A contact that gives a short impulse during contact movement.

Local / Remote / Disconnected selector switch:

The local/remote/disconnected selector switch is used to switch between remote operating and local operating (via the open/close switch). 

It also has a disconnected position where the operation is not possible. However, a protection trip bypass can be supplied that makes it possible to trip the circuit breaker remotely even in disconnected position.

Trip / Close switch:

The trip/close switch is used for control operations when the local/remote (/ disconnected) switch is in local position.