relay
electrically operated switch
solid-state relay
electronic switching device in which a small control signal controls a larger load current or voltage
protective relay
relay device designed to trip a circuit breaker when a fault is detected
time relay
electrical switch with time delay
Reed relay
electromagnetic relay employing a reed switch
earth leakage circuit breaker
electrical safety device
contactor
electronic circuit element serving as a switch
staircase timer
Timed electrical lighting switch
mercury relay
relay using mercury metal
signal relay
electrical component used in controlling train movement