12V 1Ch Relay Module with Optocoupler

The 12V 1Ch Relay Module with Optocoupler is a single-channel relay board that uses an optocoupler to provide complete electrical isolation between the low-voltage control circuit — where the Arduino or microcontroller sends the signal — and the high-voltage load circuit where the relay contact switches up to 240VAC at 10A. The optocoupler works by converting the control signal into a light pulse inside a sealed component, which then triggers the relay without any direct electrical connection between the two sides has no electrical path back to the Arduino or signal circuit.

This 12v relay module uses a 12V DC coil, making it suited for projects that already have a 12V supply available — such as automotive, industrial, and home automation builds running on 12V DC adapters or batteries. The optocoupler relay module’s galvanic isolation is what sets it apart from basic relay modules without optocoupler protection — in a basic module.

The signal circuit and relay circuit share a common ground, whereas this 1 channel relay module keeps them completely separated, which is the safer design choice for any build that switches mains voltage loads. This relay module is ideal for optocoupler-isolated 12V industrial and automation switching project.

Related Product:

• Checkout NE555 Delay Timer Switch 12V Relay Module

Features:

• Optocoupler isolation completely separates signal from relay circuit
• Prevents load-side faults from reaching and damaging Arduino GPIO
• 12V DC coil suits automotive, and 12V adapter project builds
• Single channel controls one independent load with full isolation protection

Technical Specifications:

Applications:

• Isolated 240VAC load switching from Arduino via 12V relay module
• For relay module with optocoupler isolation safety demo
• 12V control panel relay switching with galvanic isolation
• 1 channel relay module for optocoupler isolation circuit

Package Includes:

• 1 x 12V 1Ch Relay Module with Optocoupler