The 1-Channel 5V Relay Module is the most essential building block for any beginner or professional looking to control high-power appliances with low-power microcontrollers. At Electrapac, we recommend this module as the "go-to" solution for switching a single AC or DC load safely and efficiently.

Product Overview

This module allows your Arduino, Raspberry Pi, or ESP32 to act as a smart switch. Even though your microcontroller operates at only 3.3V or 5V, this relay can safely toggle devices plugged into a wall outlet (up to 250V AC) or high-capacity batteries (up to 30V DC). With built-in opto-isolation, the module ensures that electrical noise and surges stay on the "power side" and never reach your sensitive controller.

Key Features for Electrapac Customers

• Optocoupler Protection: The board includes an optical isolator that separates the input signal from the relay coil. This is a critical safety feature that prevents back-EMF from damaging your microcontroller.

• Standard 3-Pin Input: Features simple VCC, GND, and IN pins, making it compatible with standard breadboard jumper wires.

• Triple-Output Terminals: Provides NO (Normally Open), NC (Normally Closed), and COM (Common) terminals for flexible wiring configurations.

• Visual Feedback: A bright on-board LED lights up when the relay is triggered, allowing for instant visual debugging of your code.

• Micro-Sized Footprint: Its slim design makes it easy to tuck into small project boxes or stick behind a wall switch for home automation.

 Wiring & Safety Guide

When using this module from www.electrapac.com, remember these three connections for your load:

1. COM (Common): Connect your main power wire here.

2. NO (Normally Open): Connect your device here if you want it to turn ON only when the signal is sent.

3. NC (Normally Closed): Connect your device here if you want it to be ON by default and turn OFF when the signal is sent.

⚠️ SAFETY WARNING: Dealing with AC mains electricity (110V/220V) is dangerous. Always ensure the power is disconnected before wiring, and keep high-voltage wires securely fastened and insulated.

Primary Applications

• DIY Home Automation: Making a "smart" lamp, fan, or coffee machine.

• Industrial Control: Switching solenoids, valves, or high-current motors in factory prototypes.

• Agricultural Tech: Automating water pumps based on soil moisture sensor data.

• Security Systems: Activating high-power sirens or strobe lights when a sensor is tripped.

Why Shop at Electrapac?

We source our 1-Channel Relay Modules with high-quality copper traces and flame-retardant housings to handle full 10A loads without overheating. At www.electrapac.com, we provide the reliable bridges you need to connect your software to the physical world.