1-Channel 5V Relay Module (SPDT, Opto-Isolated, High-Level Trigger)
The 1-Channel 5V Relay Module (SPDT) allows your microcontroller — such as Arduino, Raspberry Pi, PIC, AVR, or ARM —
to control high-voltage devices like lights, fans, motors, and home appliances safely and easily.
Equipped with an opto-isolated input, it provides complete protection to your control circuit from voltage spikes.
This compact, reliable, and beginner-friendly module can switch up to
10A at 250V AC or 30V DC, making it perfect for automation, IoT, and robotics projects.
⚙️ Key Features
- ✅ 1-Channel 5V control relay module (SPDT type)
- ✅ High-level trigger input for direct MCU control
- ✅ Handles up to 250V AC / 10A or 30V DC / 10A
- ✅ Opto-isolated input for circuit safety and reliability
- ✅ Status indicator LED shows relay activation
- ✅ Compatible with Arduino, AVR, PIC, ARM, Raspberry Pi, etc.
- ✅ Screw terminals for easy wiring
- ✅ Compact design with mounting holes for installation
- ✅ Complies with international safety standards
Important Note
Some modules may have a printing error (e.g., “250VAC → 30VAC” or “125VAC → 28VAC”).
Please note that the actual working specification remains correct: 250VAC / 30VDC at 10A.
Technical Specifications
| Channels | 1 |
| Relay Type | SPDT (Single Pole Double Throw) |
| Trigger Type | High-Level Trigger |
| Control Voltage | 5V DC |
| Switching Voltage (AC) | Up to 250V AC @ 10A |
| Switching Voltage (DC) | Up to 30V DC @ 10A |
| Input Control Signal | 5V Logic (HIGH = Relay ON) |
| Isolation | Opto-Isolated Input |
| Indicators | Power LED & Relay Status LED |
| Mounting Holes | 4 holes (Ø 3.1mm) for easy installation |
| Dimensions | ~43mm × 17mm × 18mm |
Pin Description
| Pin | Description |
|---|---|
| VCC | +5V Power Supply |
| GND | Ground Connection |
| IN | Control Signal (High = Relay ON) |
Connection Diagram
Relay Output Terminals
| Terminal | Description |
|---|---|
| COM | Common Connection |
| NC | Normally Closed (connected to COM when relay is OFF) |
| NO | Normally Open (connected to COM when relay is ON) |
Additional Features
- ✔ One normally closed (NC) and one normally open (NO) contact
- ✔ Built-in pull-down circuit to prevent false triggering
- ✔ Power indicator lamp for easy troubleshooting
- ✔ High-impedance controller pin for stable signal input
- ✔ Can control a variety of high-current devices and equipment
- ✔ Standard TTL level logic compatible
Applications
- Home Automation Systems
- IoT Control and Monitoring
- Robotics Projects
- Smart Switches and Lighting
- DIY Electronics and Prototyping
- Load Switching for AC/DC Devices
Package Includes
- 1 × 1-Channel 5V Relay Module (SPDT, High-Level Trigger)
Tip: For improved safety, always use proper insulation when switching high-voltage AC loads.
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