Siemens ZN-31U

DescriptionThe Siemens ? Fire Safety dual-contact zone module (Model ZN-31U) is designed to provide two (2) detector line circuits that incorporate contact-type devices. These devices may be manual boxes, waterflow switches, thermal detectors, relay contacts, etc. Each circuit provides ?Class B? supervision. Model ZN-31U also contains two (2) red LED Alarm lamps and two (2) yellow LED Trouble lamps ? one of each for each circuit.