| Pin | Name | Function |
|---|---|---|
| 1 | VCC | Module logic power, 5V |
| 2 | GND | Ground |
| 3 | IN | Trigger input - LOW energizes the relay on most boards |
| 4 | COM | Common terminal for the switched load |
| 5 | NO | Normally Open - closes when relay is energized |
| 6 | NC | Normally Closed - opens when relay is energized |
Summary
Single-channel relay board that lets a low-voltage logic signal (5V) switch a high-power AC or DC load. Isolates the microcontroller from mains-level circuits — go-to part for controlling lamps, pumps, and appliances.
- Coil/trigger voltage: 5V
- Coil power draw: ~0.36W (~71mA)
- Max switching load: 10A @ 250VAC / 10A @ 30VDC
- Trigger type: Active LOW (most common boards)