The brand LCTC has many different Solid State Relay modules, but here we describe a Solid State Regulator.

The SCR regulator module

Single phase SSR voltage regulator

This module exists in different load current ranges - here we describe the 25A version.

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

Specification

  • 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
Dimensions of the module without heatsink

Functions

  • 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.
Suitable heatsinks

Connections and result

The connection of a heater element to the module
Graph of the output voltage versus the input voltage

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%
The SSR-1VF25A module
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