Relay Module 4-Channel – 5V Opto-Isolated Relay Board for Arduino, Raspberry Pi & ESP32

Relay Module 4-Channel

The Relay Module 4-Channel is a reliable and versatile switching solution designed for controlling multiple high-voltage AC or DC devices using low-voltage microcontrollers. Featuring four independent relay channels, this module is ideal for home automation, industrial control, robotics, IoT projects, and DIY electronics.

Built with opto-isolation for enhanced safety and stable performance, the module allows microcontrollers such as Arduino, Raspberry Pi, ESP32, ESP8266, STM32, and PIC to safely control appliances, motors, lights, pumps, fans, and other electrical loads.

Whether you're building a smart home system or an automation project, this 4-channel relay board provides dependable switching with easy interfacing.

Key Features

• 4 independent relay channels for controlling multiple devices

• Compatible with Arduino, Raspberry Pi, ESP32, ESP8266, STM32, AVR, and other microcontrollers

• 5V operating voltage with TTL control signals

• Opto-isolated inputs for improved electrical protection

• LED indicators for power and relay status

• High-quality PCB with screw terminal connections

• Supports both AC and DC load switching

• Easy-to-use pin headers for quick integration

Technical Specifications

• Product Type: 4-Channel Relay Module

• Operating Voltage: 5V DC

• Relay Channels: 4

• Trigger Voltage: 5V TTL

• Relay Type: Electromechanical

• Maximum Switching Capacity:

  • 250V AC, 10A

  • 30V DC, 10A

• Input Interface: IN1, IN2, IN3, IN4, VCC, GND

• Output Terminals: NO (Normally Open), NC (Normally Closed), COM (Common)

• Status Indicators: Power LED and individual relay LEDs

• Mounting Holes: Yes

Applications

• Home automation systems

• Smart lighting control

• Motor and pump control

• Industrial automation

• Robotics projects

• Security and alarm systems

• IoT and smart device control

• Remote switching applications

• DIY electronics projects

Package Includes

• 1 × Relay Module 4-Channel (5V)

Why Choose This 4-Channel Relay Module?

This relay module offers a dependable and cost-effective solution for controlling multiple electrical devices from a single microcontroller. Its opto-isolated design, high switching capacity, and broad compatibility make it an excellent choice for hobbyists, students, makers, and professionals working on automation and embedded systems.