4CH 12V Relay Module

Features

1. Number of Channels: 4 (can control 4 devices independently).
2. Input Voltage: Operates at 12V DC for the relay coil.
3. Relay Output:
   • Supports both NO (Normally Open) and NC (Normally Closed) connections.
   • Can handle high current/voltage loads (typically up to 250V AC at 10A or 30V DC at 10A).
4. Trigger Logic:
   • Designed to work with microcontrollers (like Arduino, Raspberry Pi, or ESP8266).
   • Triggered by low-level or high-level signals, depending on the module design.
5. Optocoupler Isolation: Many modules include optocouplers to isolate the control circuit from the high-power relay side, enhancing safety.
6. LED Indicators: Each relay channel typically has an LED that lights up when the relay is active.

Pin Configuration

1. Input Pins (Control Side):

   • IN1, IN2, IN3, IN4: For triggering individual relays.
   • GND: Ground.
   • VCC: Power supply (5V or 12V for relay logic, depending on the module).

2. Output Pins (Load Side):

   • COM: Common terminal.
   • NO: Normally Open terminal (connected to COM when the relay is active).
   • NC: Normally Closed terminal (connected to COM when the relay is inactive).