A C.K. switch is a low voltage switch that can be connected to a 5 or 8 disc cam lock or radial pin tumbler (RPT) lock to form a keyswitch. Once the lock is connected to the C.K. switch, it is used as part of a circuit which is controlled or activated by a key.
These switches are normally found on applications such as fire alarm systems and fuse boxes or anywhere a key may be required to control or isolate electrical power.