The SCR module

Single phase SSR voltage regulator

For the 25A model:

Typenr Input Output
SSR-1VD25A 0-10VDC 0-250VAC 25A
SSR-1VF25A 0-5VDC 0-250VAC 25A
SSR-1LA25A 4-20mA 0-250VAC 25A


  • Max input current: 12mA
  • Operation temperature: -20°C to 80°C
  • Max off-state leakage current: 2mA
  • Dielectric strength: 2500V
  • Certificates: CE, ROHS
  • Load current choice: 10A, 25A, 40A, 50A, 60A, 80A, 100A, 120A
  • Weight: 100g


  • Only suitable for resistive load.
  • Not applicable to inductive load and capacitive load, such as transformers, motors, ventilators, etc.
  • Choose your resistive load to not go over 70% of the model load: If you have a 70A resistive load, choose the 100A model.
  • Use a heat sink for the larger loads. The module has a flat metal underside, meant to be mounted on a heat sink with thermal paste.


The connection of a heater element to the module

Experiment with ESP8266 NodeMCU and Tasmota PWM

See Experiment with ESP8266 NodeMCU and Tasmota PWM.

This experiment proves that the SCR module chops off the leading edge.

The module at work: cutting the leading edge at 50%