4-Channel Relay Shield for Arduino – Module Board

🌟 Product Description

The 4-Channel Relay Shield for Arduino is an expansion board with four individually controlled electromechanical relays. Each relay provides COM, NO, and NC contacts, allowing Arduino Uno and compatible boards to switch separate AC or DC loads. The shield is suitable for home automation, robotics, industrial prototypes, lighting control, and DIY electrical projects. Depending on the exact version, the board may include optocoupler isolation, status LEDs, test buttons, an external power input, or selectable Arduino control pins.

🔑 Key Features

• Four independently controlled relay channels 
• Arduino Uno and compatible shield form factor 
• Normally Open, Normally Closed, and Common contacts 
• LED indicators for relay status 
• Screw terminals for simple load connections 
• Optocoupler isolation on supported versions 
• Manual test buttons on some shield models 
• Supports AC and DC load switching 
• Compatible with Arduino, ESP32, Raspberry Pi interface circuits, and other controllers 
• Useful for automation, robotics, and smart-home projects 
• Some versions include an XBee or wireless-module interface

Specifications:

Apps in robotics, electronics and DIY and real life apps:

Relay contacts can switch high-voltage loads, but the control board does not make mains electricity safe. Use suitable fuses, insulated enclosures, correctly rated wires, and proper clearances. High-voltage AC wiring should be installed or inspected by a qualified professional. Never exceed the relay’s voltage, current, or power ratings, and keep high-voltage wiring separated from Arduino signal wiring.