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5V 1-Channel Relay Module, Low-Level Trigger Relay Board with Optocoupler Isolation, 10A 250VAC/30VDC Relay Switch, Screw Terminals, Arduino AVR PIC ARM DSP MCU Compatible
The 5V 1-Channel Relay Module is a reliable switching board that lets microcontrollers safely control higher-voltage or higher-current devices such as lamps, fans, solenoids, pumps, and other appliances.
The 5V 1-Channel Relay Module is a reliable switching board that lets microcontrollers safely control higher-voltage or higher-current devices such as lamps, fans, solenoids, pumps, and other appliances. It uses a 5V coil relay rated up to 10A (typical resistive rating) and features optocoupler isolation to help reduce electrical noise and improve protection between your control side and the load side.
This module is designed for easy integration with popular development boards including Arduino, AVR, PIC, ARM, and DSP MCUs. With a low-level trigger input, the relay turns ON when the input pin is driven LOW, which is convenient for many microcontroller setups.
Key Features & Benefits
- Low-Voltage Control of High-Power Loads: Control AC or DC loads using a simple GPIO signal
- Low-Level Trigger: Relay activates when IN = LOW (logic low)
- Optocoupler Isolation: Improves safety/noise immunity and reduces interference to MCU
- High Switching Capability: 10A relay for common home/DIY loads (use within rating)
- Indicator LED: Visual status for power and relay activation (typical)
- Screw Terminals: Secure COM/NO/NC connections for quick wiring
Pinout / Connections (Typical)
Control Side (3-pin header):
| Pin | Function |
|---|---|
| VCC | 5V supply |
| GND | Ground |
| IN | Trigger input (LOW = ON) |
Load Side (Screw terminals):
| Terminal | Meaning |
|---|---|
| COM | Common |
| NO | Normally Open (connects to COM when relay ON) |
| NC | Normally Closed (connects to COM when relay OFF) |
Typical Specifications
| Item | Details |
|---|---|
| Module Type | 1-channel relay module |
| Coil Voltage | 5V DC |
| Trigger Type | Low-level trigger |
| Isolation | Optocoupler |
| Relay Rating (Typical) | 10A @ 250VAC / 10A @ 30VDC (resistive) |
| Use With | Arduino, AVR, PIC, ARM, DSP, MCU boards |
Safety note: Mains AC wiring can be dangerous. Use proper insulation, enclosures, and wiring practices, and never exceed relay/load ratings.
Common Applications
- Home automation (lights, sockets, fans)
- Arduino controlled pumps/solenoids
- Switching DC loads with external power supplies
- Timers, smart switches, IoT relay control projects
- Isolation switching for noisy loads
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