Product Overview
Bel 5TT Series 3 Amp Miniature Cartridge Fuse for Power Supplies and Control Circuits
Condition
Unused new old stock (NOS). Stamped markings on metal caps confirm BEL, 5TT 3, 250V, with UL and CSA certification stamps. Internal coiled wire element intact.
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Product Overview
Bel Fuse 5TT 3 is a 5x20mm miniature glass cartridge fuse engineered for overcurrent protection where circuits encounter startup inrush currents. The wound internal wire element provides a time-delay (slow-blow) characteristic, allowing temporary power spikes to pass without nuisance opening while breaking cleanly during sustained overloads. Featuring nickel-plated brass end caps and a transparent glass body, this cartridge allows fast visual inspection of the element.
Key Features
- Current rating: 3 A
- Voltage rating: 250 V AC
- Response characteristic: Time-delay (slow-blow)
- Dimensions: 5 mm diameter by 20 mm length
- Interrupting rating: 100 A at 250 V AC
- Body construction: Clear glass tube with nickel-plated brass end caps
- Safety approvals: UL Listed and CSA Certified
Applications
- Replacing blown primary fuses in audio amplifiers, linear power supplies, and control transformers where startup surges trip fast-acting fuses.
- Protecting bench equipment, power supplies, and industrial automation rails that accept standard 5x20mm clips.
- Assembling custom electronics or maker projects requiring proven time-delay protection on AC line inputs.
Frequently Asked Questions
Is the Bel Fuse 5TT 3 a fast-acting or slow-blow fuse?
The 5TT series is a time-delay (slow-blow) fuse. It uses a wound wire element designed to absorb momentary startup surges without blowing prematurely.
What are the physical dimensions of this fuse?
This is a standard 5x20mm miniature cartridge fuse, measuring 5 mm in outer diameter and 20 mm in overall length.
Why buy individual Bel 5TT 3 fuses from PartsMine instead of a generic multi-pack?
Assortment boxes often leave you with dozens of values you never use while supplying only one or two of the 3A slow-blow cartridges your equipment actually needs. Buying the exact part number from known stock lets you complete the repair with the proper rating. More pieces cost less each, and the price-break table on this page shows what each quantity costs.
Nothing halts a bench session faster than an empty drawer when a turn-on surge takes out a fuse. Keep the correct slow-blow cartridge within reach so your next power-up test stays on track.
Shipping? $8 flat rate, free once your order passes $28 - and it leaves the Idaho warehouse the same or next business day.
