EMS18A - Energy Management SwitchAIMS Power EMS18A Energy Management Switch to Prevent Tripping of Breakers The Energy Management Switch (EMS) provides a cost effective solution for power management and added protection for applications using inputs from an inverter, shore OR generator that have a single 20A branch circuit. The EMS is designed to be used anywhere where two loads share the power from a single 20A branch circuit that normally require their own breaker. Most common