5V 4-Channel Relay Module

5V 4-Channel Relay Module

This 5V 4-channel relay module lets your microcontroller safely switch up to four mains-voltage or high-current devices at once. Each channel drives an electromagnetic relay with NO (normally open), NC (normally closed) and COM screw terminals, and an opto-isolated input keeps the switching side electrically separated from your control electronics. A simple trigger signal turns each relay on or off — ideal for home automation, robotics and multi-appliance control.

Features

• 4 independent relay channels
• Opto-isolated inputs for safe, noise-free switching
• Each relay rated up to 10A at 250V AC / 30V DC
• NO / NC / COM screw terminals per channel
• Onboard LED indicators for each channel
• Active-LOW trigger — easy to drive from 3.3V or 5V logic
• Works with Arduino, ESP32, ESP8266 and Raspberry Pi

Specifications

• Channels: 4
• Coil voltage: 5V
• Contact rating: 10A @ 250V AC / 10A @ 30V DC
• Trigger: Active-LOW digital input
• Isolation: Opto-coupler on each input
• Terminals: Screw terminals (NO/NC/COM)

Applications

• Home and appliance automation
• Switching multiple lights, fans, pumps and motors
• Robotics and industrial control
• IoT-controlled power switching

Package Includes

• 1 x 5V 4-Channel Relay Module

Frequently Asked Questions

Can it switch mains voltage?
Yes — each relay is rated up to 10A at 250V AC. Always take proper safety precautions when working with mains.

What is the trigger logic?
Active-LOW — a LOW signal on a channel energises that relay.

Are the inputs isolated?
Yes — opto-isolated inputs keep the switching side electrically separated from your microcontroller.

Recommended Pairings

Works great with our ESP32-S3 board and Arduino Nano. Learn more about relays.