The Load Bank control panel includes the load step switches, protection circuit alarm indicators and test instrumentation. All load steps are controlled by magnetic contactors which are activated by panel switches, one switch for each resistive step and each inductive step. In addition, a Master Load switch is provided to permit application of block loads. The Load Bank is monitored for system failures, including fan failure, overtemperature, ground fault and underfrequency (to protect inductive elements). Failure detection results in opening of contactor control circuit and activation of panel alarms light. An internal power supply provides control power of 24VDC for the load step contactors and protection circuits and 180VDC for the fan motor. The input to the control power-supply is switch selectable to either the power source under test or to an external 200-240VAC, 1-phase, 50/60Hz source. A 15' cable with plug is included for connection to external control power.