electrical relay, which is intended to be energized by a quantity, the value of which is either within its operative range or effectively zero NOTE - 'All-or-nothing relays' include both 'elementary relays' and 'time relays'.an electrical relay which is intended to be energized by a quantity whose value is either within its operative range or effectively zero
An electrical relay which is intended to be energized by a quantity, whose value is either higher than that at which it picks up or lower than that at which it drops out.