M.S. Switch

An M.S. switch is a mains voltage switch that can be connected to an RPT, 5 or 8 disc camlock to form a keyswitch. Once the camlock is connected to the M.S. 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 circuit breakers and switchgears or anywhere a key may be required to control or isolate electrical power.