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Source 16-channel relay modules for automation, IoT, and control projects in South Africa. Check live stock, compare brands, and collect at local branches with Communica.
Shop multiple 16-channel relay board variants with verified stock at local branches.
Choose from established relay module brands and access SA-focused support.
Order with immediate pickup at Samrand, Pretoria, or Cape Town; VAT-compliant invoicing available.
16-channel relay boards are a core building block for industrial, student, and maker projects that need to switch multiple circuits with a single controller. These compact modules combine 16 electromechanical or solid-state relays with convenient logic-level inputs, letting you automate lights, pumps, motors, or security lines from a PLC, Arduino, Raspberry Pi, or other development boards. At Communica, you'll find a selection of relay modules in various relay ratings, coil voltages, and interface options, ready for collection at Samrand, Pretoria CBD, or Cape Town branches.
| Feature | Typical Value | Notes |
|---|---|---|
| Number of Channels | 16 | Individually controllable outputs |
| Relay Type | EMR or SSR | Electromechanical (clicking relays), Solid State (silent, long-life) |
| Control Voltage | 5V, 12V, 24V DC | Match MCU or PLC levels |
| Contact Rating | Typically 10A @ 250VAC | Check specific model |
| Input Interface | Opto-isolated, Screw Terminals | Safer logic isolation |
| Form Factor | PCB module (DIN available) | Mounting holes for enclosures or panels |
Relay modules are suited for applications like home automation, process control, industrial machine interfacing, and educational projects where multiple loads must be switched safely and reliably. Communica stocks key brands popular in Southern Africa, including boards designed for Arduino, Raspberry Pi, and PLC integration.
Selecting the right board depends on your control system, load requirements, and enclosure space. Here are practical guidelines for South African users:
Here is a simple wiring guide for connecting a typical 16-channel relay board to an Arduino Uno to control multiple outputs:
+---------------------------+ | Arduino UNO | | D2 --Relay IN1 | | D3 --Relay IN2 | | D4 --Relay IN3 | | ... | | GND --Relay GND | | 5V --Relay VCC | +---------------------------+ | | [16-channel relay board] | | Relay outputs wired to individual loads | | Load Common, NO/NC as required +
To select the right relay rating, use the formula:
Relay Maximum Current (A) >= (Total Load in W) / (Supply Voltage in V)
For 8 x 100W lighting circuits running at 230V AC:
Total load = 8 x 100W = 800W
Required relay current = 800W / 230V ~ 3.5A per channel
If your relay board is rated 10A @ 250V, it is suitable for this application with ample headroom.
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
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Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
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Excellent service so far
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Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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Needed to buy a bluetooth GPS receiver. The staff was friendly, knowledgeable and assisted without any issues. This is a toys tore of note for peopl...
azul and Nicole were very helpful and very efficient
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They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
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One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
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Great service, Rehaan and Layla were spectacular with assistance. 10/10 Would definitely recommend.
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Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
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I received a great service from Rehaan, Windy and Nocole. Excellent customer service.
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Verified customerREHAAN and Nicole are extremely helpful and friendly people made my experience at communica a breeze to shop. Thank you again for the help.
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Quick quality customer service.
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Very good service and a happy welcoming smile from the cashier Nicole
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Anyone that seriously loves technology ought to spend time here. They definitely have what you want. Best tech store!
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Verified customerSydney en Lacy was baie hulpvaardig. Goeie diens!
Verified customerNicolene
Verified customerGreat place to purchase electronic components at a fair price. They have a wide range of products and a well functioning ticketing system that ensures...
After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
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I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
Verified customerThe new ticketing system is great, but the queues are still exceedingly long, and there are hardly any staff on hand in the shop to assist with questi...
I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
Verified customerExcellent range of items, with technical staff that know their stuff. Unfortunate location that makes it a bit difficult to get to, but worth the tre...
Wide range of electronic components. Very likely to find what you are looking for. Arthur was very helpful. Don't bother trying to call for informatio...
Great place. Reasonable prices. Keeps component level items as well as security, surveillance and electrical items and tools
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Great pricing and a wide variety of products to choose from. A must visit if you've ever been to the Pretoria branch.
Verified customerNicole was very helpfull and friendly.
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Verified customerFor Sonoff ewelink WiFi switch.
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Verified customerBig electronic component shop. Counter can be very busy. Lots of parking.
Verified customerClose to closing time so i was in and out quickly
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Verified customerExcellent service Nicole
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Verified customerDefinitely will have what you're looking for.
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Verified customergood selection of electronic supplies accessible
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Verified customerGet answers to common questions about Home Automation And Iot
