16-Channel Relay Boards for Sale in South Africa - Find Stock, Specs & Pricing | Communica

What is a 16-Channel Relay Board?

A 16-channel relay board is a PCB-based device offering 16 electrically isolated relays for switching medium to high current loads (lights, pumps, motors, etc.) using a low-voltage logic signal. Common in control panels, smart-home, and process automation in South Africa, these boards allow you to control multiple high-powered circuits with a single controller or microcontroller.

Key Specifications

Why Buy 16-Channel Relay Boards from Communica?

• Stocked locally for quick branch pickup or delivery anywhere in South Africa
• Transparent ZAR pricing (VAT-inclusive quotes for students, universities, and business accounts)
• Breadth of choice: Brands range from standard value modules to heavy-duty relay boards
• Expert help desk for compatibility and wiring advice (online or in-branch)
• Directly compatible with PLCs, development boards, or any NPN/PNP logic outputs
• Thousands of essential accessories available - DIN rail holders, enclosures, industrial connectors, and power supplies

Selecting the Right 16-Channel Relay Board

Choosing the right relay board ensures safe operation and clean control signals. Consider these practical factors for your South African build:

• Supply Voltage: Match relay coil voltage (5V, 12V, or 24V) to your controller's output and available PSU.
• Current Rating: Confirm that the relay contact rating exceeds your load's peak current (e.g., for a 230VAC pump at 3A, a 10A relay provides a safe margin).
• Logic Interface: For microcontrollers (Arduino, Raspberry Pi, ESP32), boards with opto-isolation guard against voltage spikes. For PLCs, ensure the input logic (NPN/PNP) matches your system.
• Mounting: Enclosures and DIN rail adapters simplify professional installation, with added safety for industrial or educational labs.
• Indicator LEDs: Visible status feedback assists with diagnostics during prototyping or troubleshooting.

Example Application: Home Automation Panel

Suppose you're wiring an automated irrigation and lighting system in Johannesburg. Using a 16-channel 12V relay board, each relay controls a separate zone. Connect the logic inputs to your controller (e.g., Arduino Mega), and wire the NO/NC terminals to field loads via terminal blocks. Use a 12V regulated power supply capable of at least 1A (allowing roughly 50-60mA per relay x 16, plus controller headroom). Communica stocks compatible PSUs and fused DIN mounts for secure power distribution.

Controller   Relay Board                Load
(Digital Out)--[Opto Isolation & Relay]--(NO/COM)--[Pump/Motor]
(12V DC)  ----[Relay Supply]------------[VCC/GND]

Bundle with Accessories for a Complete Solution

• Pair 16-channel relay boards with matching enclosures for lab safety and cable management
• Stock up on jumper wires, screw terminal blocks, and ribbon cables for rapid prototyping
• Add surge-suppression modules to protect your relays from inductive load spikes

Product Comparison Table

• *Prices rounded as of Jun 2024; actual product page reflects current ZAR inclusive of VAT and stock status.

Browse the full Relay category or shop by brand to find variants, accessories, and technical datasheets, or visit your nearest branch.

Sources

• Communica: Relay Boards Category
• Omron South Africa - PLC Relay Module Reference
• Finder - Industrial Relay Modules
• Adafruit - Related Relay Boards & Maker Resources
• Communica - Branches & Trading Hours