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A safer way for Makers and DIY'ers to control mains ac power with a microcontroller.

PowerSwitch Tail II
PowerSwitch Tail II Kit
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PowerSwitch Tail IIU-120 Kit for 110-120vac mains

(PN 82135)  



PowerSwitch Tail IIU-240 Kit for 200-240vac mains

(PN 82235)



 These products are no longer available. Please order our new PSTK kits. This page is provided for information only. 

A customizable PowerSwitch Tail for global applications. (Power cords are not included)





  • Two versions*: PST IIU-120 for 100-120vac devices and PST IIU-240 for 200-240vac devices. Both provide single pole switching at 20 amps and 5300vrms isolation.
  • User provides power cords to match country of use. Cords solder directly to PCB pads or connect with optional euro style terminal blocks.
  • Wide actuation voltage range and low current requirement. Kit includes resistors to optimize actuation voltage from 3 to 24vdc at 5 to 10 ma.
  • Drive directly from microcontroller pin with as little as 3vdc @ 3ma. Suitable for use with battery operated controllers.
  • Two wire signal connection. Does not require a separate dc power supply other than the actuating signal.
  •  No exposed ac wiring when used with included case.
  •  LED status indicator shows when dc side is energized.


Kits include PCB, case, selected resistor values for input optimization and other components. Power cords are not included. Soldering is required for assembly. See the assembly instructions.

*Conversion from one model to the other is not possible without replacing key components.

Our liability is limited to the purchase price of this product only. By using this product you agree that, LLC can not be held liable for any damages or injuries resulting from use, misuse, or repair. This product is for indoor use only.