SCR Power Controller Products

3 Phase, Zero Cross (2 Leg Control)

The term Zero-Cross (synchronous operation of SCR's) is derived from the fact that the SCR's are turned on only when the instantaneous value of the sinusoidal wave is zero. In Zero-Cross operation, power is applied for a number of continuous half-cycles and then removed for a number of half-cycles to achieve the desired load power in the same manner as power would be controlled with a mechanical switching device. The frequency of the on-off cycles can be extremely fast because there is no limit to the number of switching operations the SCR can perform.

Model Phase Mode Voltage Current Highlights
3020 Three Zero Cross120-575 Vac 10-70 Amps @ 55°C Powered off of the 4/20mA loop, so no control transformer is required.
3021A Three Zero Cross120-575 Vac 10-70 Amps @ 55°C Accepts most commands.
3021B Three Zero Cross120-575 Vac 10-70 Amps @ 55°C Accepts most commands. Sync-guard smoothes out line current draw when multiple controllers are in use.
3027 Three Zero Cross120-575 Vac 85-750 Amps @ 55°C Accepts most commands. Features include: Sync-guard, Trans-guard and on-board line fusing for most frame sizes.
3037 Three Zero Cross120-575 Vac 85-750 Amps @ 55°C Accepts most commands. Features include: Sync-guard, Trans-guard, Shorted SCR detection and on-board line fusing for most frame sizes.
Custom Whether you need a modification to a standard power control product or a completely new custom design, we are ready to assist you. Read more about our Custom OEM Products
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