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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
240vac Kits
16-ch PWM Controller
PowerSSR Tail
ZeroCross Tail
PowerState Tail
CB500 Circuit Breaker
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PowerSSR Tail

(PN 80125) 


$19.99 each 

In stock!


A power cord for phase control of up to 300 watts of power to 120vac non-inductive loads.



  • Solid-state triac switching; longer service life, no audible contact click and faster response time.
  • Controls power to loads up to 300 watts, non-inductive, with a 3vdc (3ma) to 12vdc (30ma) steady or pulsed control signal.
  • Provides random (not zero-cross) switching suitable for 120vac phase-control dimmer applications for incandescent and LED light strings. Use the ZeroCross Tail to safely obtain the necessary zero-crossing sync pulse. View video.
  • Connects directly to I/O pin of the Arduino, Raspberry Pi, Beaglebone or other 3.3 or 5 volt MCU.
  • 5300vrms isolation between ac circuit and signal connection.
  • Built-in LED indicates status of control signal.
  • No exposed 120vac voltages and no dangerous 120vac wiring required. Can be installed by non-technical users: Instruction sheet.
  • Plugs into standard 120vac 3-prong household outlets, power strips, and extension cords.



  • AC input: NEMA 5-15P Plug, standard 120vac with ground.
  • AC output: NEMA 5-15R Receptacle, standard 120vac with ground.
  • Load capacity: 120vac, 300 watts maximum continuous load, non-inductive.
  • Switching device: Solid-state triac.
  • DC input: 3-12vdc (3-30ma), terminal block accepts #14-30 AWG wire..
  • Operate times: Suitable for 60hz phase control of incandescent and LED light strings.
  • DC to ac circuit isolation: Optically isolated >5,000vrms.
  • Indicator: LED indicates when dc side is energized.
  • Protection: AC side protected with 150vac MOV. DC side is transient free.
  • Mounting: Two #6 screws or free standing.
  • Indoor use only.

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.