The 5V 4-Channel Relay Module is a versatile multi-output switching board that allows you to control up to four high-voltage appliances using a single microcontroller. At Electrapac, we recommend this module for users building smart-home systems, automated workstations, or robotics projects that require managing multiple independent AC or DC loads.

Product Overview

This module features four independent relays, each capable of switching up to 10A. It acts as a bridge between low-power digital signals (from an Arduino, Raspberry Pi, or ESP32) and high-power electrical devices. Each channel is Opto-isolated, meaning your microcontroller is physically and electrically protected from the high-voltage side of the circuit by an optical barrier.

Key Features for Electrapac Customers

• Quad-Channel Control: Manage four separate devices—such as a water pump, a light bulb, a heater, and a fan—independently using only 4 digital pins.

• Opto-Isolated Protection: On-board optocouplers prevent "back-EMF" or electrical spikes from your appliances from traveling back to your microcontroller.

• Standard Terminal Interface: Each relay provides three screw-terminal outputs: NO (Normally Open), NC (Normally Closed), and COM (Common) for secure, solder-free wiring.

• Status Indicators: Includes four individual LEDs that light up when a relay is triggered, making it easy to debug your code and monitor system status.

• Universal Compatibility: Works seamlessly with all 5V logic controllers (Arduino Uno/Mega, 8051, PIC). For 3.3V devices like the ESP32, an external 5V supply for the VCC is required.

Wiring Guide

To ensure a safe and successful setup with components from www.electrapac.com:

1. Input Pins:

   • VCC: Connect to 5V DC.

   • GND: Connect to Common Ground.

   • IN1 - IN4: Connect to the Digital Output pins of your controller.

2. Output Terminals (The Load):

   • COM: The center pin where you connect the "Live" or "Hot" wire.

   • NO (Normally Open): The circuit is OFF by default and turns ON when triggered.

   • NC (Normally Closed): The circuit is ON by default and turns OFF when triggered.

Primary Applications

• Home Automation: Controlling 220V lights, fans, or appliances via Wi-Fi or Bluetooth modules.

• Industrial Control: Managing multiple solenoids, valves, or high-current motors.

• Greenhouse Automation: Coordinating grow lights, irrigation pumps, and ventilation fans.

• Security Systems: Activating alarms, sirens, and magnetic door locks.

Why Shop at Electrapac?

We source our 4-Channel Relay Modules with high-quality components designed for longevity under continuous use. At www.electrapac.com, we provide the reliable switching power you need to scale up your automation projects.