5V Single Channel Optocoupler Isolated Relay Module – Low Level Trigger

Description

Product Overview

The 5V Single Channel Optocoupler Isolated Relay Module is a high-performance, ready-to-use control module that allows your low-voltage microcontroller (such as Arduino, ESP32, or Raspberry Pi) to safely and reliably switch high-power AC or DC loads. Whether you’re controlling home appliances, motors, or industrial equipment, this module provides a robust interface between your 5V logic and the high-voltage world .

At its core is a high-quality electromagnetic relay capable of switching loads up to 10A at 250V AC or 10A at 30V DC. The module features optocoupler isolation, which creates a physical and electrical barrier between your sensitive control circuit and the potentially hazardous load side. This isolation protects your microcontroller from dangerous voltage spikes, back-EMF from motors, and electrical noise .

Designed with a low-level trigger, this module is activated when you apply a LOW signal (0V) to the input pin. This default behavior ensures that the relay remains off during power-up or microcontroller reset, preventing accidental activation of connected devices . An onboard status LED provides clear visual confirmation of relay operation, and the module’s compact design allows for easy integration into breadboards, enclosures, or custom PCBs.

Key Features

• Optocoupler Isolation: Provides complete electrical isolation between the control side (5V logic) and the load side (up to 250V AC), protecting your microcontroller from voltage spikes and electrical noise .

• High Load Capacity: SPDT relay contacts rated for 10A at 250V AC or 10A at 30V DC, suitable for controlling lights, fans, pumps, solenoids, and small motors .

• Low Level Trigger: The relay activates when the IN pin is pulled LOW (0V). This “active LOW” behavior is designed for safety—the relay remains off during power-up or if the control signal is lost .

• Clear Status Indicators: Onboard LEDs provide visual feedback: a power LED (typically green) lights when the module is powered, and a relay status LED (typically red) illuminates when the relay is activated .

• SPDT Contact Configuration: Provides Common (COM), Normally Open (NO), and Normally Closed (NC) terminals for flexible wiring options. Use NO for devices that should be OFF by default, or NC for devices that should be ON by default .

• Easy 3-Pin Control Interface: Standard 2.54mm pitch header for VCC (5V), GND, and IN (control signal) allows direct connection to breadboards and microcontrollers .

• Compact and Durable: Small form factor with mounting holes for secure installation. The isolation slot between control and load areas enhances safety .

• Wide Compatibility: Works with 5V logic from Arduino, and can be controlled by 3.3V microcontrollers like ESP32 or Raspberry Pi with proper level considerations .

Technical Specifications