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Learn how to choose the right 8A 5x20mm fuse for DIY and hobby circuits. Covers current rating, fast vs. slow blow, wiring tips, and local sourcing from Communica.
5x20mm fuses fit most hobby enclosures and offer reliable circuit protection up to 8A.
Select the right fuse speed to handle surges or protect sensitive electronics.
Explore fuse types, holders, and accessories available for collection or delivery at Communica branches.
The 5x20mm cartridge fuse is a mainstay in DIY electronics thanks to its compact size and dependable interrupt characteristics. Rated at 8A, these fuses are commonly used for protecting power supplies, DC circuits, low-voltage AC devices, and experimental builds. When current exceeds 8 amps, the internal element melts, breaking the circuit and helping prevent damage, overheating, or potential fire hazards.
In South Africa, the 5x20mm form factor is popular among students, hobbyists, and professionals due to its ease of sourcing, affordable price point, and wide compatibility with panel and PCB fuse holders.
Understanding fuse parameters is key to safe selection. The most relevant specifications for 8A 5x20mm fuses are:
| Parameter | Typical Value/Range | Notes |
|---|---|---|
| Rated Current | 8A | Max continuous load before fusing |
| Rated Voltage | Up to 250V AC/DC | Check datasheet for specific fuse model |
| Blow Type | Fast/Quick or Slow/Time-lag | Select based on load inrush/surge profile |
| Breaking Capacity | 35A-100A (typical) | Max current the fuse safely interrupts |
Consideration: Always confirm the fuse's voltage and current ratings match or exceed your application's requirements. Overrating the fuse may reduce protection, while underrating could cause nuisance trips.
The main difference between fast- and slow-blow fuses is their reaction to overcurrent surges:
Suppose you have a 12V DC motor rated at 6A running a small mechanical assembly. Allowing for a start-up surge and variability, a suitable fuse value is calculated as:
Fuse rating = Load current x 1.25 - 1.5
6A x 1.25 = 7.5A
6A x 1.5 = 9A
An 8A fuse (slow-blow, if inrush occurs) balances protection and nuisance tripping. For fast-blow, use only if the load is purely resistive or sensitive electronics require quick interruption.
SA-specific note: Always check lead times and available stock online or at your nearest Communica branch to avoid project delays. Fuse pricing for 8A 5x20mm typically ranges from R5-R25 (ZAR) per unit depending on quantity and brand.
Find a broad range of 8A 5x20mm fuses, compatible holders, and accessories in the Fuses and Circuit Protection categories on Communica. Stock includes Littelfuse, Accord, and Bussmann options, as well as essential wiring tools and multimeters.
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.
Very friendly and helpful; and a wide selection of items (at their location). You can also purchase via their WebSite; I have never been disappointed...
Review for Communica Samrand Security Wanted to share a heartfelt thank you to the security team at Communica Samrand! Yesterday, I had a personal ex...
Quick service from Layla and her team in providing technical assistance and getting my order together. This is the best service I have received in a l...
I love this place and have been purchasing my electronic parts over 25 years . Layla has been a super sales lady ..friendly and knows her products .
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Quick quality customer service.
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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...
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Verified customerNicole was very helpfull and friendly.
Verified customerGood job Nicole! Well done!
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Verified customerThank you for your patience ma'am Mpho
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Verified customerGreat service from Cynthia and Nicole
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Verified customerClose to closing time so i was in and out quickly
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Verified customerWide variety of electronic goods. Staff helpful with good advise.
Verified customerGood verity, lots of stock, mostly helpful staff
Verified customerVery helpfull. Thank you
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Verified customerExcellent service Nicole
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Verified customerGreat for your electronic needs - Prices are a bit expensive
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Verified customerDefinitely will have what you're looking for.
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Verified customerCommunica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
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