Crydom spf series 25a solid state relay sip panel mount crydom spf240a25 this 25a solid state relay has an operating voltage of 12 to 280v ac and a control voltage of 90 to 140v ac the ssr features an integrated heatsink design that provides excellent thermal management the relay has an optically separated scr output and also features low leakage current in off state mode and high peak current making it suitable for a wide range of heavy industrial applications crydom spf240a25 solid stat