The ETS-20-DR Emergency Lighting Control Device allows the use of auxiliary generator or inverter power on switched fixtures in power failure situations. The ETS-20-DR senses the loss of normal AC power and bypasses local control devices such as switches, occupancy sensors, or timers, providing emergency power to the fixtures regardless of the control setting. The ETS-20-DR allows for operation of the load at full light output until normal power is restored or for as long as the generator or inverter supply is available. The ETS-20-DR will work in conjunction with any fixture on the designated 20 amp circuit per rated specifications.