The relay board is designed for controlling high-power electrical loads using a low-voltage control signal.
The module is built around a 12 V DC electromagnetic relay, driven by a transistor and an optocoupler mounted on the PCB. The control input is galvanically isolated by the optocoupler, providing safe separation between the control electronics and the power circuit.
The board is suitable for use as an electronic switch or relay module for controlling fans, motors, lamps, high-power LEDs, and other loads. It can be easily driven by microcontrollers, logic circuits, and various electronic control systems.
Two LEDs provide clear visual indication - one indicates power supply presence, and the other shows the presence of an input control signal.

Warning:
When operating with voltages above 24 V, all safety regulations for working with high voltage must be strictly observed.

Technical Specifications:
Supply voltage: 12 V DC (polarity must be observed).
Control input voltage: 5 - 12 V DC (polarity must be observed).
Galvanic isolation: optocoupler.
Indication:
- Power LED - D3,
- Input signal LED - D2.
Relay type: electromagnetic.
Relay output contacts:
- NO - normally open,
- COM - common,
- NC - normally closed.
Contact ratings:
- 15 A / 125 V AC,
- 10 A / 240 V AC,
- 15 A / 24 V DC.
Maximum contact current: 15 A.
Maximum switching voltage:
- 240 V AC,
- 100 V DC.
PCB dimensions: 53 x 29 mm.

This product is a DIY assembly kit.
It is also available as a fully assembled module - Product code 1685 (separate product).