4-Channel Relay Boards for Sale in South Africa - Find Stock at Communica

4-Channel Relay Boards - Shop Local, Automate Smarter

Looking for a flexible way to control multiple high-voltage devices from your low-voltage electronics? 4-channel relay boards offer an ideal bridge for home automation, robotics, industrial controls, and learning platforms. Communica stocks a diverse range of 4-relay modules designed for seamless switching from 3V to 5V logic, supporting popular brands and hobbyist hardware.

Product Types: What's Available?

• Opto-isolated relay boards (for added microcontroller protection)
• 3V, 5V, or 12V coil relays to suit microcontrollers, Raspberry Pi, or PLCs
• Screw terminal outputs for AC or DC load wiring
• Relay boards with indicator LEDs for each channel
• Compatible with popular chipsets: Arduino, ESP32, Pi, PIC, STM32, and more

Popular stocked brands include Songle, Keyes, and generic relay modules, along with high-quality industrial options from trusted manufacturers like Finder and Omron (search availability per current listings).

Key Specifications at a Glance

Before purchasing, confirm that your control board's output pin voltage matches the relay coil requirements (e.g., 5V logic for Arduino, 3.3V for Pi/GPIO, 12V in some PLC or automotive setups).

Compatibility & Integration

• Direct fit with solderless breadboards for prototyping
• Screw terminals for reliable load connections, handy for both AC mains and DC circuits
• DuPont header inputs for neat wiring from microcontroller or dev board
• Indicator LEDs to display relay states

Relay modules are a staple in both maker and education labs across South Africa - ideal for projects like energy monitoring systems, irrigation switching, access control, or simple home automation panels.

Accessory Bundles & Extras

• Headers, jumpers, ribbon cables, and standoffs for enclosure mounting
• DIN-rail clips (on select models, search in store)
• Spares: replacement relays, sockets, protective covers

Choosing the Right Relay Board for Your Application

Your relay board selection should be tailored to both your control logic (3.3V vs 5V), the switching voltage/current of your load, and how you'll physically mount or house your build.

Example Wiring Diagram (ASCII)

-------------------------
| Arduino   |  Relay    |    AC Lamp
|  Pin D7   |  IN1      |----------||----
|  Pin D8   |  IN2      |----------||----
|  GND      |  GND      |
|  5V       |  VCC      |
-------------------------

Connect up to four control pins from your microcontroller to the relay inputs. Use screw terminals to run switching wires to your devices, keeping mains and logic sides isolated for safety.

Stock & Lead Time Considerations

• Standard 4-relay modules usually available ex-stock at Samrand and Pretoria branches
• Cape Town branch carries most Arduino- and Pi-compatible relay boards
• Industrial relays or specialty variants may have 2-10 day lead times

Communica's product pages include real-time inventory and part numbers - check before heading to a branch or reserving for collection. Bulk and educational orders can be arranged via the sub-distributor network for institutions or campus labs.

Brands & Accessories to Explore

• Brands: Songle, Keyes, Finder, Omron, and more
• Accessory categories: Connectors-Wire, Tools for installation, Enclosures for safety
• Shop by brand or relay module category for fast filtering

Add to Cart & Compare

• View specs to match board voltage, relay capacity, and size
• Compare features like LED indicators, isolation, and form factor
• Read reviews and see project compatibility tips on product pages

Sources

• Relay Modules Collection - Communica
• Shop by Brand - Communica
• Arduino Uno Pinout Diagram
• Relay Technology Reference - Omega
• Branch & Trading Hours - Communica