4-Channel 5V Relay Module
- Supports 5V microcontroller control signals. Controls four independent electrical devices.
Description
The 4-Channel 5V Relay Module allows a microcontroller to independently switch four electrical devices. Each channel uses an electromechanical SPDT relay with Normally Open (NO), Normally Closed (NC), and Common (COM) terminals. Common versions use SRD-05VDC-SL-C relays, rated up to 10A at 250V AC or 30V DC per relay, subject to proper load and wiring conditions. The module operates from a 5V DC supply and provides four input pins: IN1, IN2, IN3, and IN4. It is compatible with Arduino, ESP32, ESP8266, STM32, and other controllers with suitable logic-level compatibility. Individual LEDs indicate relay status, while supported versions include optocoupler isolation. It is useful for home automation, robotics, lighting, pumps, and IoT projects. Use a separate, adequately rated 5V supply when multiple relays operate together.
Specifications
| Module Type | 4-channel electromechanical relay module |
|---|---|
| Operating Voltage | 5V DC |
| Number of Channels | 4 independent channels |
| Relay Model | SRD-05VDC-SL-C or compatible |
| Contact Configuration | SPDT (NO, COM, NC) per channel |
| Maximum AC Load | 10A at 250V AC per relay (rated) |
| Maximum DC Load | 10A at 30V DC per relay (rated) |
| Control Interface | VCC, GND, IN1, IN2, IN3, IN4 |
| Trigger Type | Typically active LOW; varies by board |
| Indicators / Isolation | Individual status LEDs; optocoupler on supported versions |