Surge plugs are used for the secondary protection of computers, video
equipment, TV, alarms and other electronic equipment. They are available
in the normal 16A round pin.
These plugs are fitted with an over current and thermal fuse. In the rare
event of varistor failure, the varistors are disconnected from the mains
supply, preventing any dangerous temperature rise. The fault indication
LED which is normally lit will go OFF to indicate the faulty protection has
been disconnected. Mains power will still be available to the unprotected
equipment.