Crydom PCV Series Proportional Power Controllers. Proportional power controllers in the SSR industry standard rectangular "hockey puck" package. Using a simple 2-10Vd.c. power source, voltages of up to 240Va.c. and currents of up to 40A are able to be easily and efficiently controlled. Typical applications include; resistive heating elements, rectified d.c. motors, industrial temperature control, conveyor speed control, light dimming, infrared and quartz heaters. Internal snubbers as standard Control circuit requires no calibration 2-10Vd.c. logic compatible input