RS-232 control relay panel for AV and lighting. Adds serial circuit control to an existing breaker panel via latching switched relays. Tested, complete package, low labor, mount next to circuit breaker panel to control AC power "hot" lines. Time proven, reliable, G-E RR7P3 latching relays snap in and have low voltage plug-in connectors. Low power consumption, no continuous relay coil current, runs cool for long life.