SCR Power Controller Products

3 Phase, Zero Cross (3 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
3321A Three Zero Cross120-575 Vac 10-70 Amps @ 55°C Accepts most commands.
3337 Three Zero Cross208-575 Vac 200-750 Amps @ 55°C Accepts most commands. Features include: Sync-guard, Trans-guard, shorted SCR detection and on-board line fusing for most frame sizes.
FUSION Three Phase Three (3 Leg or 2 Leg Operation) Phase Angle or Zero Cross24 - 600 Vac, 45 - 65 Hz 50 - 1200 Amps The FUSION three phase ac power controller is a phase angle or zero cross fired controller which linearly controls, with respect to the setpoint, the AC voltage, current, or true power applied to a three phase electrical load. The 3 phase controller can be ordered in either 2 or 3 leg control with 2 leg being limited to zero cross firing. Control is achieved for 3 leg by three pairs of inverse parallel SCR’s or in 2 leg by 2 pairs of inverse parallel SCR’s.
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