NGA-703 is a fully monitored device which permits the interfacing of third party equipment with the Fire Alarm Control panel using three normally open dry contact connections while also providing three changeover output relays to control ancillary equipment. The connections to the input are monitored for fault (open or short circuit) and Alarm conditions.

The output relays require an external 24 V DC supply. Relay operation is confirmed by onboard Red The LEDS, A Yellow general Fault LED is also provided. NGA-703 occupies three consecutive addresses on the detection Loop.