Tested, complete package low labor mount next to any circuit breaker panel to sequence 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. Diagnostic LEDs and internal ON - OFF test switches speed installation for testing and troubleshooting. Cabinet and all components connected to high voltage are UL listed low voltage electronics are isolated. 4, 8 or 10 20/30A circuits, 120 or 240 volt models available. Up to 6 One Touch remote control locations possible. Kill function uses external contact for instantaneous shutdown.