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Power Controls > Solid State Relays > Watlow Series SSR

Watlow solid state relays (SSR) offer many of the advantages of solid state power controllers, but at a lower cost. Watlow's extensive knowledge in power controller design led to the development of a special fast cycle input card that enables a solid state relay to operate from a standard 4-20mA instrumentation command signal. Test results show that zero-cross solid state relays in combination with the fast cycle card promote better temperature control and longer heater life than slow cycle relays. Through a time proportional cycle rate of 1⁄10 of a second, heater life will be extended.

Watlow provides all of the components necessary for trouble-free operation. This includes two standard convenience items: a thermal foil to ensure proper thermal transfer from the relay to the heat sink and belleville washers to ensure that the relay is mounted with sufficient pressure to enable good heat transfer. Matched semiconductor fuses and heat sinks are available to complete the power switching package.

Features & Benefits

  • Fast cycle cardIncreases heater lifeOptimizes temperature control: Allows for higher watt density heaters
  • Zero cross firing: Results in minimal electrical noise
  • Back-to-back SCR design: Withstands harsh or hostile industrial environments
  • UL® recognized File #E151484 and #E73741 CSA certified up to 600VAC,
  • File #LR700195 VDE 60950 License #40021401, File #1995500 up to 480VAC, CE
  • Meets applications requiring agency approval



Single Loop Controllers


Spec Sheet (pdf)


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