1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino

1-Channel Relay Module with Optocoupler Isolation – DC 3.3V / 5V / 12V / 24V

Take full control of high-power loads in your electronics projects with this versatile 1-Channel Electromagnetic Relay Module. Designed for Arduino, Raspberry Pi, and a wide range of microcontroller platforms, this board features dual optocoupler isolation for stable, noise-free switching performance. Whether you're automating home devices, building a DIY control system, or prototyping industrial circuits, this module delivers reliable results every time.

Made in Mainland China.

Key Features

• Wide Voltage Compatibility: Supports DC 3.3V, 5V, 12V, and 24V power inputs — works seamlessly with virtually any microcontroller.
• High-Power Load Capacity: Normally open (NO) interface handles up to AC 250V/10A or DC 30V/10A for switching real-world loads.
• Dual Optocoupler Isolation: Strong drive capability with stable performance; low trigger current of just 5mA protects your control circuitry.
• High/Low Level Trigger Selection: Jumper-selectable high or low level trigger on each channel — maximum flexibility for your circuit design.
• Fault-Tolerant Design: Even if the control line is disconnected, the relay remains in its safe state — no accidental switching.
• Status Indicators: Green power LED and red relay status LED provide at-a-glance monitoring of module operation.
• User-Friendly Terminals: All interfaces are accessible via screw terminals — no soldering required for quick wiring.

Module Interface Guide

• DC+: Connect to positive power supply terminal (match relay voltage — 5V, 12V, etc.)
• DC–: Connect to negative (ground) power supply terminal
• IN: Control signal input — accepts high or low logic level from your microcontroller

Relay Output Terminals

• NO (Normally Open): Open circuit when relay is idle; closes to COM when activated
• COM (Common): Shared relay terminal
• NC (Normally Closed): Short-circuited to COM when relay is idle; opens when activated

Trigger Level Selection

• S1 Jumper: Selects high or low level trigger for relay channel 1
• Short COM to LOW → Low-level trigger active
• Short COM to HIGH → High-level trigger active

Technical Specifications

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Learn More About Electronics Safety

For guidance on electrical safety when working with relay modules and high-voltage circuits, visit the OSHA Electrical Safety resource page.

Frequently Asked Questions

Q: What voltages does this relay module support?

A: This 1-channel relay module supports a wide input voltage range of DC 3.3V, 5V, 12V, and 24V, making it compatible with Arduino, Raspberry Pi, ESP32, ESP8266, and most other microcontrollers and development boards.

Q: Can I use this relay module with Arduino to switch AC mains devices?

A: Yes. The normally open (NO) output terminal is rated for up to AC 250V / 10A, so it can switch standard mains-voltage devices when properly wired. Always follow appropriate electrical safety precautions when working with AC voltages.

Q: How do I select high or low level triggering?

A: Use the onboard S1 jumper to select the trigger level. Shorting COM to LOW configures the relay for low-level triggering (active LOW), while shorting COM to HIGH sets it for high-level triggering (active HIGH). This makes it easy to match your microcontroller's logic output.

Q: What does the dual optocoupler isolation do?

A: The dual optocoupler isolation electrically separates your microcontroller's control circuit from the relay's switching circuit. This protects your Arduino or other controller from voltage spikes and interference generated by the switched load, ensuring stable and safe operation.