The Exitronix RELAY-120 or RELAY-277 Emergency Lighting Control Device allows local switch control of designated emergency luminaires when emergency power is provided by a generator or inverter. The RELAY-120 or RELAY-277 senses the loss of normal AC power and bypasses the local switch device allowing emergency power directly to the fixture regardless of switch position. The RELAY-120 or RELAY-277 are rated for any lamp load up to 3.8A @ 120VAC or 1.7A @ 277VAC of continuous power including LED loads per NEMA 410 standards. The RELAY-120 or RELAY-277 are ideal solutions for achieving increased energy savings in accordance with most energy efficiency standards. This is achieved by eliminating the need to operate the designated emergency fixtures 24/7 when emergency power is sourced from a generator or inverter.