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Comprehensive guide to choosing the correct 1A 5x20mm MB fuse for electronic circuits in South Africa. Includes specs, trusted brands, and practical application notes.
Understand what a 1A 5x20mm MB fuse is and when to use one.
Learn how to size, rate, and install fuses for safety and reliability.
Find popular fuse brands and stock status at Communica branches.
Fuses are essential safety components in electronic circuits, preventing equipment damage and fire hazards in case of faults. The 1A 5x20mm MB fuse is one of the most commonly used fuses in hobby, education, and light industrial installations around South Africa. This guide explains what these fuses do and how to choose the right one for your application, whether you're wiring a development board, replacing a fuse in lab equipment, or designing a custom power solution.
The 1A 5x20mm MB fuse is a cylindrical glass or ceramic fuse with a diameter of 5mm and length of 20mm, designed to break the circuit if over 1 ampere (A) of current flows for a certain duration. MB typically refers to a medium-blow (medium time-delay) characteristic. This type is used for moderate inrush or surge protection-striking a balance between fast protection and avoiding nuisance blowing from normal, short-term current surges (like motor starts or capacitor charging).
| Spec | Typical Value / Note | Implication |
|---|---|---|
| Current Rating | 1A | Max. continuous current without fuse action |
| Voltage Rating | Usually 250V AC | Do not exceed-for mains/mixed AC-DC circuits |
| Time-Current Characteristic | Medium-blow (MB, T, M) | Withstands moderate surges before opening |
| Size / Format | 5mm x 20mm | Check your holder matches this size |
| Breaking Capacity | Standard (e.g., 35A or 100A) | Choose based on expected short-circuit fault |
Always refer to the datasheet or product page for exact specs. The 'MB' marking can vary between fuse brands-check time-current curves for application suitability.
| Parameter | Value |
|---|---|
| Normal Circuit Current (In) | 0.7A |
| Fuse Current Rating (Ifuse) | 1A |
| Voltage Rating (V) | 250V AC |
At Communica, you'll find a variety of brands including Littelfuse, Eaton, and common generic fuses. Branch pickup and VAT invoices are available, with typical stock levels displayed online or via the branch network.
| Type | Response | Best For |
|---|---|---|
| Fast (F) | Opens quickly | Sensitive electronics |
| Medium-Blow (MB/T/M) | Withstands surges | Motors, power supplies |
| Slow-Blow (S/B) | Maximum surge | Transformers |
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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Verified customerI had a fantastic experience at Communica, thanks to the exceptional service provided by Rehaan in sales and Nicole at the cashier. Rehaan was incredi...
Got assisted by a very patient and diligent gentleman by the name Sydney. He was patient in getting me what I needed from the little information I gav...
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Verified customerThanks for you friendly and good service...
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Puleng and Nicole gave me awesome and friendly service
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Fatima was very helpful and patient with my many queries. The shop itself has seen better days but the service was great.
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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
Verified customerFast good price service. Thank you Sydney.
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Excellent service so far
Verified customerSydney offered exceptional service. He took me step by step on what I needed to buy. Thank you Nicole for the service
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Verified customerI will rate the service 5 star. Layla was incredibly friendly and helpful, assisting me with finding the items I needed.
Verified customerThe service I always get from Sydney And Lacy the Cashier is amazing. Those are my guys...keep up the good works gentlemen.
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Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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Verified customerAwesome service, very friendly and helpful people. Best help and assistance from Avi, and such lovely chats with Nicole.
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Quick quality customer service.
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Verified customerNicole , excellent service, first time to visit.
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Verified customerFriendly awesome service from Nicole, well done!
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Verified customerNicole was absolutely friendly and very helpful.
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Verified customerNicole was welcoming.. Good service.thanks
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Verified customerMpho helped us quickly and with knowledge Excellent
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Verified customerVery good service from Nicole
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Verified customerMy electronics go to place
Verified customerGreat service
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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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.
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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...
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Verified customerNicole was very helpfull and friendly.
Verified customerGood job Nicole! Well done!
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Verified customerAll the goodies in one place and Mohamed is always willing to help
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 customergood selection of electronic supplies accessible
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