Three phase
Firing mode: 
Zero cross

3227 is available as a Custom OEM model only. Contact the factory for more information.

The model 3227 SCR power controller, linearly controls, with respect to a command signal, the electrical power applied to three-phase resistive load. It does this by zero-cross operation of silicon controlled rectifiers (SCRs) which are connected in two of the three load leads.


The command signal may be a mA current signal, a 0 to 5 Vdc signal, a 0 to 10 Vdc signal or a potentiometer. The 3227 provides electrical isolation of the command signals allowing either grounded or ungrounded com- mands.


Three fast acting fuses within the controller protect the SCRs from fault currents. These fuses can, in many situations, also be relied upon to protect the load from fault currents.