5V Single-Channel Relay Module

Overview

The **5V Single-Channel Relay Module** allows you to control high-power devices like lights, fans, and appliances using low-voltage control signals from a microcontroller such as Arduino or Raspberry Pi. It features an optocoupler for isolation and an LED indicator for status monitoring.

Specifications

• Operating Voltage: 5V DC
• Trigger Voltage: 3.3V to 5V
• Relay Capacity: 250V AC at 10A or 30V DC at 10A
• Number of Relays: 1
• Trigger Type: Active LOW
• Isolation: Optocoupler for safe operation
• LED Indicator: Shows relay status
• Dimensions: Approx. 50mm x 20mm

Pinout

Working Principle

When the control signal (3.3V-5V) is applied to the **IN** pin, the relay activates, connecting the Normally Open (NO) terminal to the Common (COM) terminal. This allows current to flow through the connected device. The optocoupler provides isolation between the low-voltage control side and the high-power switching side, protecting the microcontroller from potential surges.

Relay Terminals

• **COM (Common)**: The common terminal for switching
• **NO (Normally Open)**: Connected to COM when the relay is active
• **NC (Normally Closed)**: Connected to COM when the relay is inactive

Applications

• Home automation
• Industrial equipment control
• IoT-based projects
• Smart agriculture
• Remote device management