The Viking Firecycle® Multi-Cycle OH Detector is a heat sensitive, normally closed, electrical detector, which operates at a fixed temperature. It is rate compensating and features automatic recycling. The detection units are connected with fire-resistant detector cable in series from and to the Firecycle® III Multi-Cycle Control Panel. When a detector is heated to the temperature set point, a mechanical switch opens and breaks the series circuit interrupting the flow of current. When the temperature drops below the set point, the circuit is re-established.