4-Channel Relay Boards for Sale - Request a Quote at Communica

4-Channel Relay Boards for Sale Across South Africa

Relay boards are an essential building block for switching and automation in electronics, industrial control, and home automation. Communica offers a broad range of 4-channel relay modules, ideal for hobbyists, education labs, small industry projects, and professional installations. Each board integrates four electromechanical or solid-state relays for handling multiple circuits from a single microcontroller or PLC output.

Find the Right Module for Your Project

At Communica, you'll find:

• Standard 4x relay boards (5V, 12V, 24V input) for direct logic-level control
• Diverse relay ratings: 3A, 5A, 10A AC and DC loads
• Opto-isolated, ULN2803 driver, and industrial signal boards available
• Models with relay status LEDs, screw terminals or pin headers
• DIN-rail and PCB-mountable variants from leading brands

Whether adding outputs to an Arduino, expanding a university lab bench, or building industrial panels, our local stock is regularly updated to ensure continuity and certainty.

Why Request a Quote?

For high-volume, institutional, or formal requirements, you can request a detailed VAT quote directly from Communica:

• Bulk pricing for education, system integrators, and SA businesses
• Get written VAT invoices for PO processing and B2B procurement
• Reserve or tailor your order (multiple board types, accessories, brands)

Types and Specifications at a Glance

Popular brands and lines in stock may include Songle, Finder, OMRON, Keyes, and generic PCBs, all vetted for reliability and compatibility with South African AC mains and typical 12V/24V supply rails.

Specification Callouts & Compatibility Tips

• Input voltage: Match to supply or MCU (e.g., 5V for Arduino, 3.3V for ESP32 or basic IoT, 12V/24V for industrial)
• Contact rating: Check the maximum switching current and voltage for each application (mains, DC loads, etc.)
• Control logic: Ensure compatibility (active low/high trigger, opto-isolation if used in noise-prone environments)
• Mounting: Choose between PCB, screw-mount, or DIN-rail models based on final installation

Multi-channel relay boards can be combined for expanded IO. Accessory bundles, such as screw terminals or pre-wired cables, are also available for streamlined installation.

Branch Pickup, Online Check, and Local Support

Communica's active branch network allows you to:

• Check live stock at Samrand HQ or Pretoria/Cape Town outlets
• Arrange for collection or courier delivery after your quote is approved
• Request account-based quotes for schools, tertiary labs, and companies

Top 4-Channel Relay Applications in South Africa

• PLC-controlled and remote panel building (industrial controls)
• IoT/smart home: lighting, gate, and pump switching
• University and TVET technical labs (practical switching experiments)
• Installer/maintenance kits and proof-of-concept builds

All units purchased through Communica include a VAT invoice, support for documented quoting, and options to aggregate with other components for consolidated delivery.

How to Get a Quote

• Specify quantity, preferred spec (voltage, current, mounting), and accessories needed
• Submit request via the online form or email (see Communica's contact page)
• Include company or school info for account and VAT documentation

For related products, browse Relay Boards or All Components for compatible cable sets, enclosures, and controller modules.

Sources

• Communica - Relay Board Category
• Communica - Shop by Brand
• Communica - Branches & Trading Hours
• OMRON - Relay Family Overview
• Keyestudio - Relay Module Data