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Comprehensive guide to CQ122 fuses for electronics: sizing, types, ratings, and buying tips for South African makers and professionals.
Protect sensitive circuits and tools with reliable, compact fuse solutions.
Learn key specs, sizing, and application tips for CQ122 fuses.
Source CQ122 fuses and accessories quickly from Communica branches in South Africa.
Fuses are essential devices for protecting circuits, instruments, and handheld tools by interrupting the current flow during an overload or fault. The CQ122 fuse is a widely used cartridge-type fuse, valued for its compact size and fast-reacting protection in low- and medium-current applications. These fuses are popular in power supplies, test equipment, low-voltage electronics, and as replacements in many imported or locally assembled devices common to South African labs and workshops.
Makers, students, engineers, and buyers often encounter CQ122 fuses when servicing soldering irons, meters, desktop power supplies, or embedded system test benches. The correct fuse choice enhances safety, prevents extensive board or component damage, and is a basic requirement for both tertiary education and industry compliance.
A CQ122 fuse typically refers to a cylindrical cartridge fuse with glass or ceramic body, axial metal end caps, and standard sizes such as 5x20mm or 6.3x32mm. These fuses are rated by their maximum current (in amperes), voltage withstand, and speed (fast-blow or time-delay).
| Category | Typical Value/Range | Notes |
|---|---|---|
| Voltage rating (V) | 125V / 250V | Choose equal or above supply voltage |
| Current rating (A) | 0.5A - 10A | Match to circuit max current |
| Fusing speed | F (Fast), T (Time-delay) | Time-delay for inductive, Fast for sensitive electronics |
| Body size | 5x20 mm, 6.3x32 mm | Confirm fits holder/socket |
The CQ122 fuse's construction consists of a thin wire element sealed in a glass or ceramic tube, with metal end caps for electrical connection. Circuit diagrams use the following symbol:
_______
---O========O--- (Fuse symbol in ASCII: O=connection, ====fuse wire)
To choose a CQ122 fuse, consider where and how it's being used. Some key criteria include:
For most electronics, fuse current is set at 125-150% of the device's maximum working current, to allow for brief inrush surges while still offering rapid interruption during sustained faults. Use Ohm's Law and a margin of safety for calculating:
If a bench supply draws 2A peak, a 2.5A fuse (to nearest size up) is a good starting point. For a 5V, 1A microcontroller project: 1A x 1.25 = 1.25A, select a 1.25A or nearest available fuse. Always check if a fast or time-delay (T) fuse is required by the equipment designer.
Brands such as Littelfuse, Bussmann, and leading local suppliers are available, ensuring easy branch collection, VAT invoices, and fast turnaround for educational labs and trade customers.
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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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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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
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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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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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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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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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Verified customerCynthia was very very helpful.
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Verified customerFriendly awesome service from Nicole, well done!
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Verified customerLovely service received from Nicole thank you lady
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Verified customerPuling and Nicole gave me a best service. P
Verified customerFatima & Nicole delivered an excellent customer service
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Verified customerNicole was absolutely friendly and very helpful.
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Verified customerNicole was welcoming.. Good service.thanks
Verified customerMpho was very help full. Great service
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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 customerThanks for the quick help Sidney and Nicole.
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Verified customerGreat service by Sydney and Nicole
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Verified customerEXCELLENT SERVICE FRONT JACQUELINE AND Windie
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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 got the most pleasant service from Sydney and Windie
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Verified customerNicole was very helpfull and friendly.
Verified customerGood job Nicole! Well done!
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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
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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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