CHQ-DRC/OEM(SCI) Hochiki Dual Relay Controller with IsolatorManufactured by Hochiki, this Hochiki CHQ DRC OEM (SCI) Hochiki Dual Relay Controller With Isolator 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 shut down. The monitored input can be used for local power supply fault monitoring or as a general purpose input. A back box is also available (CHQ BACKBOX)