3321A Three Phase Power Controller

The model 3321A controller is a three phase distributive Zero Cross SCR controller. Distributive zero-cross control implies that the load voltage is switched on or off only when the instantaneous value of the sinusoidal supply voltage is zero and that the load power is controlled by varying the number of electrical cycles that power is applied to and removed from the load.

The controller is capable of accepting mA command signals, DC voltage signals, or it may be controlled by a potentiometer. The command signal input is isolated from the line and load voltages.