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Comprehensive guide to choosing the correct thermal fuse for heat sink applications. Learn about fuse types, specs, and sourcing in South Africa at Communica.
Understand cutoff, hold, and resettable thermal fuses for safe heat sink design.
Learn how to match temperature rating, size, and current specs to your project.
Explore stocked thermal fuses and accessories at Communica for fast SA delivery.
Heat sinks are vital for managing excess heat in power electronics, but without a dedicated form of circuit protection, overheating can still damage sensitive components. Thermal fuses provide a critical safety cut-off - disconnecting power or the load if the heat sink (or the device it cools) exceeds a predetermined temperature. This is essential in South African environments, where ambient temperatures and power instability can contribute to increased thermal risks in industrial controllers, power supplies, or even student robots.
A thermal fuse is not the same as a resettable thermostat; it's a single-use, temperature-sensitive device designed to permanently open a circuit if its rated temperature is reached. Choosing the right fuse is important for protecting MOSFETs, voltage regulators, and other heat-sinked parts in both hobby and professional builds.
| Type | Description | Typical Applications |
|---|---|---|
| One-shot (thermal cutoff) | Opens permanently at a specified temperature; must be replaced after activation. | Power supplies, transformers, home appliances |
| Thermal switch (resettable) | Automatically resets after cooling down; opens/closes circuit at preset temperatures. | Fan control, motor protection, heating elements |
| PTC (polymer resettable fuse) | Limits current when overheated, resets automatically once cooled. | Battery packs, low-voltage DC boards |
Note: The most common choice for heat sink safety is the one-shot (thermal cutoff) fuse. These are widely available from international makers like Littelfuse, Bel, and TKS, all stocked locally at Communica.
Always refer to the application's normal and fault thermal profiles: Use a margin between your normal operating peak and the fuse cut-off to avoid nuisance trips in summer or poorly ventilated enclosures.
| Model | Tf ( degreesC) | Current (A) | Voltage (V) | Type |
|---|---|---|---|---|
| Littelfuse BF139E | 133 | 10 | 250 | One-shot |
| Bel SDF125 | 125 | 10 | 250 | One-shot |
| TKS MF72C150 | 150 | 5 | 250 | One-shot |
For other available models, visit Communica's Fuses Collection and filter by temperature, size, and brand.
Discover quality circuit protection & passive components products related to Which Thermal Fuse for a Heat Sink? Selection Guide for South African Engineers
Ck-100 | Thermostat • 100°c • 250v • 10a • Fixed Bracket Horizontal Lead • 19.5x6x4.2mm
Rh03b-75 | Thermal Cut-off • 75°c • 250v • 2a • Axial • 10x2.8mm
Rh03b-150 | Thermal Cut-off • 150°c • 250v • 2a • Axial • 10x2.8mm
Rh01-125 | Thermal Cut-off • 125°c • 250v • 2a • Radial • 6x6.5x2.8mm
Rh01-120 | Thermal Cut-off • 120°c • 250v • 2a • Radial • 6x6.5x2.8mm
Rh01-110 | Thermal Cut-off • 110°c • 250v • 2a • Radial • 6x6.5x2.8mm
Rh01-100 | Thermal Cut-off • 100°c • 250v • 2a • Radial • 6x6.5x2.8mm
Rh01-130 | Thermal Cut-off • 130°c • 250v • 2a • Radial • 6x6.5x2.8mm
Rh01-140 | Thermal Cut-off • 140°c • 250v • 2a • Radial • 6x6.5x2.8mm
Rh03b-100 | Thermal Cut-off • 100°c • 250v • 2a • Axial • 10x2.8mm
Rh01-150 | Thermal Cut-off • 150°c • 250v • 2a • Radial • 6x6.5x2.8mm
SA Sourcing Note: Local availability can fluctuate. Communica's online stock checker allows you to see if the right fuse type (e.g., 133 degreesC, 10A, 250V) is ready for same-day branch pickup, ship-to-campus, or invoicing for schools.
Suppose you're building a linear power supply for a university lab, using a TO-220 voltage regulator on a heat sink. The maximum regulator junction temperature is 150 degreesC. Expected peak enclosure temp in summer: 40 degreesC. Normal operation gets the heat sink to 85 degreesC. To choose a fuse:
| Application | Recommended Tf ( degreesC) | Current (A) | Mounting |
|---|---|---|---|
| Lab PSU | 133-139 | 5-10 | Heat sink clip |
| Industrial Controller | 125-133 | 5-10 | Inline/PCB |
| Maker Robotics | 115-133 | 1-5 | PCB or chassis |
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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...
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Visited a couple of times for supplies and specialised parts Staff is extremely friendly and always helpfull
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What an absolute gem Layla is! She went out of her way to source my requested items from another branch, without me asking, and done so with a great b...
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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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Can i give Fatima her flowers.... 10 000 out of 100. Customer service-100% Patience-100% Product knowledge-100% Had the best shopping experience there...
Leila was very helpful and super nice!
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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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Great experience with every purchase thanks to Sydney and nicole
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Ordered online, was just after 6am. Asked if I can pick items up as I wanted to install over the weekend and delivery stated 2-4 working days. Though...
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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Excellent service by Sydney at the ino counter. So many awsome products! Perfect place to buy gifts for tech junky friends.
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Leburu and nicole were both very helpful my boss send me to get few items as I wasn't very familiar with the items Leburu and my boss spoke with each ...
Sydney and Nicole were amazing I came in and finished within no time thank you so much keep up the friendly service
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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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Verified customerThe service was great and Nicole helped me alot. I will definitely come back
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Great service, Rehaan and Layla were spectacular with assistance. 10/10 Would definitely recommend.
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Verified customerArrived and the item i wanted was sold out! Rose assisted me and went out of her way to help me get me the goods! 10/10 customer service!
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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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Quick quality customer service.
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Very good service and a happy welcoming smile from the cashier Nicole
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Verified customerFatima & Nicole delivered an excellent customer service
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Verified customerMpho helped us quickly and with knowledge Excellent
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Verified customerVery good service from Nicole
Verified customerPatient and kind
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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...
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
Verified customerGreat inventory. Very slow service, though the staff seem to do their best. Single till open mostly with overbearing security measures. Can do with so...
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.
Verified customerGood job Nicole! Well done!
Verified customerSlowest service ever! Even worst cashiers. I shudder to go. Good products though.
Verified customerGood service, would recommend.
Verified customerWide range of electronics for the diy enthusiastic, ranging from solar systems to alarms and cctv.
Verified customerGreat for electronics but stock is a problem quite often so call before going through.
Verified customerService has improved but still a long way to go to actually sort it out.
Verified customerFriendly service and a vast range of electronic components, devices etc.
Verified customerThe is a computerised quing system and you can pick n pay....but the problem is the is no lift and the only way to get up is using steps
Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
Verified customerGood verity of products. Helpful staff albeit a bit slow
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Verified customerGreat service from Cynthia and Nicole
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Verified customerSomethings are getting pricey, but still a good place to pick up components
Verified customerNicole and Sydney were very helpful
Verified customerElectronic store for DIY electronics and prototyping guys. Doesn't look all that great but should have what you're looking for.
Verified customerA good electrical/electronic sales store packed with almost every component you require
Verified customerIf you love engineering you'll love this shop apart from the terrible queues and long waiting times
Verified customerAlmost all electronic spares available at reasonable prices.
Verified customerVery fast and friendly service, avoid it in friday afternoon if possible.
Verified customerExcellent, ask for Sydney. Solved immediately
Verified customerThey have everything you would need. Service is good
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
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
Verified customerWide variety of components and electronic goods. Helpfull personel.
Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
Verified customerGreat for your electronic needs - Prices are a bit expensive
Verified customerGreat showroom, electronics hobbyist's paradise
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Verified customerDefinitely will have what you're looking for.
Verified customerCheap electronics and great educational goodies for the kids
Verified customergood selection of electronic supplies accessible
Verified customerGreat variety of stock on hand
Verified customerGood variety of electronic components available
Verified customerWide variety of electronic supplies available here
Verified customerVery good
Verified customerBig variety and good prices
Verified customerAll your electronics requirements under one roof, and more!
Verified customerThe place to go whatever your electrical and electronics needs.
Verified customerExcellent range of electronic products
Verified customerInteresting & you can find everything here
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Verified customerVery helpful and professional
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Verified customerFantastic range of goods
Verified customerTidy store with a lot of variety
Verified customerLove everything here...
Verified customerGood range of products
Verified customerWhatever you need they have
Verified customerLarge number of electronic components
Verified customerCan spend hours in there
Verified customerRather a slow process
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Verified customerGood products
Verified customerHelpful and efficient
Verified customerPlace if definite interest
Verified customerGet electronic kits
Verified customerWide range of components
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Verified customerElectronic components wholesaler
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Verified customerFascinating
Verified customerWaiting time can be annoing.
Verified customerCommunica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
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