4-Channel Relay Boards for Sale in Stock | Fast Collection from Communica

Why Choose a 4-Channel Relay Board?

4-channel relay boards are versatile modules designed to interface low-voltage logic (3.3V/5V) with high-voltage loads (220V AC or 24V DC) for applications like home automation, industrial control, robotics, and IoT. Whether you need to switch lights, fans, pumps, or multiple circuits from a single microcontroller or PLC, these relay boards are an efficient solution, offering:

• Multiple independent switching channels (normally open/normally closed contacts)
• Opto-isolation for logic-load separation and safety
• LED status indicators for quick troubleshooting
• Standard form factors for breadboards or DIN-rail mounting

Features & Specifications

When selecting a 4-channel relay board in South Africa, consider the following typical specs available through Communica's stocked brands:

Popular stocked brands at Communica include Songle, Keyes, and generic Maker-series boards, all chosen for their compatibility, performance, and local support.

Compatibility and Accessory Options

Most 4-channel relay modules interoperate with a wide range of platforms, including Arduino, Raspberry Pi, ESP32, and industrial control systems. For robust industrial use, you may wish to add:

• DIN-rail adapters for panel mounting
• Spare screw terminals for easy wiring
• Logic level shifters for 3.3V-5V interfacing

Accessories and cables are stocked for same-day pickup at Samrand and other branches as listed on the Branches & Trading Hours page.

How to Use a 4-Channel Relay Board: Typical Wiring Example

Connecting a relay module to your controller is straightforward. Here's a basic ASCII diagram for controlling household appliances (use mains voltage only if you are qualified and follow all safety precautions):

Controller Output ----IN1..IN4----[Relay Board]----NO/NC Outputs----> Devices
     | (5V/3.3V)
     +-----GND ------------------ GND

Quick Selection Checklist

• Number of channels required (future expansion?)
• Relay current and voltage ratings
• Input trigger level (3.3V or 5V)
• Form factor-DIN-rail, screw mount, or plug-in
• LED indicators for error-free setup

All relay boards sold by Communica include full technical datasheets for easy integration into student and industry automation projects. VAT invoices are available for business and tertiary orders.

Popular Applications in South Africa

• Smart home: lighting, irrigation, appliance switching
• Industrial control: PLC-based automation, mini SCADA setups
• STEM & educational: school/tertiary lab demonstrations, student engineering builds
• Prototyping: rapid test jigs, robotics actuators

Explore Related Products

Find relay boards under the Relays category. For accessories, visit Connectors and Tools to complete your setup.

Sources

• Relay Boards at Communica
• Arduino Relay Shield Documentation
• Raspberry Pi Relay HAT Guide
• Songle Relay Product Specifications
• Communica Branches & Trading Hours