Three Phase Air and Oil VAP automatic rectifiers are furnished with the same features as the single-phase units.

VAP rectifiers are available with voltage, current, and potential control modes.

• Constant Voltage Control mode: In this mode of operation, the rectifier output voltage is adjusted up or down by the operator and is held constant at the set point. The rectifier's output current changes as load resistance changes.

• Constant Current Control mode: When a constant current rectifier is specified, the operator has the ability to adjust the output control to a maximum desired level. The rectifier automatically adjusts its output voltage to maintain the desired current level as load resistance changes.

• Constant Potential Control mode: The operator has the capability of setting the desired reference to structure potential. The rectifier automatically adjusts its output voltage to maintain the desired structure potential as the actual potential attempts to change.