CHQ-DRC2/DIN(SCI) Dual Relay Controller - DIN Enclosure with SCICHQ DRC2 DIN(SCI) Dual Relay Controller DIN Enclosure with SCI Manufactured by Hochiki, this Hochiki CHQ DRC2 DIN (SCI) Dual Relay Controller DIN Enclosure With SCI is a Dual Relay Controller designed to provide two general purpose relay outputs, each output can be driven separately for control of such devices as dampers or for control of plant and equipment shutdown. The monitored input can be used for local power supply fault monitoring or as a