Solid State Relays for Power Switching


A range of low cost solid state relays for resistive loads with AC or DC triggers

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Solid State Relays

Using solid state relays, it is possible to achieve a very smooth power flow to the load. Switching cycles as low as 1 second are normal using these devices. When mounted correctly with heat transfer paste on a correctly sized heat sink, they will switch reliably for many years. Please seek advice if using close to maximum current rating. A red LED shows when power is on (where fitted).

Fan cooling is recommended for applications above 40 amps continuous

  • Zero cross switching
  • Internal RC snubber
  • Input / output  optical isolation 600V
  • AC-90 to 280V rating at each current capacity
  • 3-32 V DC trigger voltage or 90-280V AC according to model
  • Trigger current draw 10-20mA depending on voltage for DC  2-5mA for AC
  • Turn on voltage 3VDC  or 90 VAC
  • Turn off voltage 1 VDC or 10 VAC

Downloads:   Data sheet

Additional information


10A 240V AC – DC trigger, 10A 240V AC – AC trigger, 25A 240V AC – DC trigger, 25A 240V AC – potentiometer control, 40A 380VAC – AC trigger, 40A 380VAC, 4-32VDC input, 50A 380VAC – AC trigger, 80A 240VAC – AC trigger