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3959_0 AC Solid State Relay 280V 25A

Product Code: 3959
Excl. VAT: £18.66 Incl. VAT: £22.39
  • Buy 5 for £17.68 (£21.22 incl. tax) each and save 6%
  • Buy 10 for £16.52 (£19.82 incl. tax) each and save 12%
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The 3953_0 AC Solid State Relay can be used to switch loads of up to 120A at 20VAC using the digital output from a Phidget I/O board.

Package includes:

  • A Heat Transfer Pad

  • TMOV20RP200E varistor

If your SSR is overheating, you should consider getting a heat sink for safety. Heat sinks 3955 and 3956 are compatible with this device. This SSR comes with a heat transfer pad that can be placed between the metal base of the SSR and the surface it's mounted to in order to help encourage heat flow. It also comes with a varistor that can be used to protect your SSR against voltage spikes in some applications.

This SSR comes with a heat transfer pad and a TMOV20RP200E varistor. Use the heat transfer pad whenever mounting the SSR on a heat sink or metal surface. If you're switching a load at 120V or less, you can put the varistor across the load terminals in parallel with the rest of the load circuit in order to protect your relay from voltage spikes. If you're switching a load higher than 120V, do not use the varistor. For more information, see the Solid State Relay Primer.

 Product Features


Electrical Properties

Isolation Method Photoelectric
Dielectric Strength 2.5 kV AC
Control Voltage Min 4 V DC
Control Voltage Max 32 V DC
Load Voltage Max (AC) 280 V AC
Load Current Max (AC) 25 A
Load Surge Current 260 A
Turn-on Time Max 2 ms


Physical Properties

Length 57 mm
Width 43 mm
Height 25 mm
Operating Temperature Min -20 °C
Operating Temperature Max 80 °C


Other Properties

Manufacturer Part Number KD20C25AX

Product Attachments

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Whenever possible, items which are in stock are dispatched the same day, or the next working day.

Large and/or heavy items are dispatched by UPS courier service and these orders must be placed before 15:00hrs (GMT) to ensure same day dispatch.

Small items are normally sent using a Royal Mail service for UK orders, and International Airmail or UPS for overseas orders

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3959_0 AC Solid State Relay 280V 25A

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