Take Control of Your High-Power Projects

Unlock the potential of your microcontroller with our 12V Opto-Isolated Relay Module. Whether you're a hobbyist working with an Arduino, Raspberry Pi, ESP32, or a professional building a custom automation system, this module provides a safe and reliable way to control high-voltage and high-current devices like lights, motors, fans, and solenoids.

Available in 2, 4, or 8-channel configurations, you can choose the perfect fit for your project's needs.

Key Features

• Flexible Channel Options: Choose from 2, 4, or 8 channels to match the scale of your project, from simple a simple switch to complex multi-device automation.
• High/Low Level Trigger (Selectable): A built-in jumper allows you to set each channel to trigger on either a HIGH signal (e.g., 3.3V/5V) or a LOW signal (0V/GND). This provides maximum compatibility with virtually any microcontroller.
• True Optocoupler Isolation: Each relay channel is equipped with a genuine optocoupler, creating an electrical barrier between your delicate microcontroller and the high-power output circuit. This protects your logic board from voltage spikes and ground loop interference.
• High-Current Relays: Equipped with high-quality Songle SRD-12VDC-SL-C relays, each channel can handle heavy loads up to 10A at 250VAC or 10A at 30VDC.
• Status Indicator LEDs: Each channel has two onboard LEDs: a power indicator (Green) and a relay status indicator (Red) that lights up when the relay is active, making debugging your circuit a breeze.
• Stable & Reliable: Features screw terminal blocks for secure input and output connections, and mounting holes for easy installation in your enclosure.

How to Use the High/Low Trigger

This module offers maximum flexibility with its trigger selection:

1. Locate the Jumper: Find the 3-pin jumper block for the module (or for each channel on multi-channel boards).
2. Set to Low Level Trigger: Place the jumper cap to connect the L pin and the COM pin. The relay will activate when your I/O pin sends a LOW (0V) signal.
3. Set to High Level Trigger: Place the jumper cap to connect the H pin and the COM pin. The relay will activate when your I/O pin sends a HIGH (e.g., 5V) signal.

Specifications

• Coil Voltage: 12V DC
• Available Channels: 2, 4, 8
• Relay Model: Songle SRD-12VDC-SL-C
• Max Load Rating: 10A 250VAC / 10A 125VAC / 10A 30VDC / 10A 28VDC
• Trigger Voltage: 3.3V - 12V (Compatible with most microcontrollers)
• Trigger Current: ~5mA per channel
• Isolation: Optocoupler
• Output Terminals: Normally Open (NO), Common (COM), Normally Closed (NC)