... Exit signals, Exhaust fans, Other auxiliary devicesSpecifications:Power Source: VST-R598-0: 100 ~ 240V AC 50 ~ 60Hz VST-R598-1: 100 ~ 120V ... max(VST-R598-0) Contact Rating: 5A max at 220V AC or 28V DCAmbient Humidity: 10%~90%Interconnect Models: This ... heat, smoke/CO, and CO alarm models: S598 series, H598 series, CPS598 series, C598 series. These are low-voltage interconnect alarms with a YELLOW ...