Fast-Blow Fuse 4A, Glass, Fusible, Size 5x20mm, Set of 100 pcs
Available in stock
| Quantity | Price per unit | You save |
|---|---|---|
| 1–2 pcs | 25,99 lei | — |
| 3–4 pcs | 24,69 lei | 5% (−1,30 lei/unit) |
| 5–10 pcs | 23,39 lei | 10% (−2,60 lei/unit) |
| 11+ pcs | 22,09 lei | 15% (−3,90 lei/unit) |
4A Fast-blow Fuses for Electrical Circuit Protection
Set of 100 fast-blow glass tube fuses, designed for efficient protection of electrical and electronic equipment against overloads and short circuits. The standard 5x20mm size ensures universal compatibility with power supplies, stabilizers, transformers, and other household or industrial devices. A reliable solution for preventive maintenance and quick replacements at an affordable price.
What you get with this product
- Guaranteed stock for at least 100 repairs or installations — no more running out of fuses when you need them urgently
- Universal compatibility with most 250V equipment — works with power supplies, TVs, radios, stabilizers, transformers
- Fast circuit protection — instantly disconnects when amperage is exceeded, preventing damage to expensive equipment
- Clear status visibility — transparent glass tube allows quick checking if the fuse is blown without disassembling
- Internationally recognized standard 5x20mm size — mounts directly into existing fuse holders without adapters
- Excellent price-quality ratio for bulk sets — ideal for service centers, electricians, or households with many appliances
How it works and how to install
Each fuse contains a metallic filament inside the glass tube that instantly melts when the nominal current of 4A is exceeded, interrupting the electrical circuit. Installation is simple: disconnect the appliance from the mains, remove the blown fuse from the fuse holder, insert the new fuse until secure, then reconnect. The glass tube allows visual inspection — a broken filament indicates a blown fuse. No special tools are required, just observe the correct polarity in certain fuse holders.
Frequently asked questions
How do I know if this fuse fits my appliance?
Check the appliance label or technical manual for specifications — it must match the maximum voltage 250V, current 4A, and size 5x20mm. If the old fuse has these physical dimensions, the set is compatible.
Why does the fuse blow frequently on my appliance?
Repeated blowing indicates a problem with the equipment — internal short circuit, excessive consumption, or undersized fuse. Never replace with a higher amperage than recommended by the manufacturer, as there is a risk of fire.
Can I use these fuses for appliances with a current lower than 4A?
Yes, the 4A fuse also protects circuits with lower consumption — it will disconnect when the 4A threshold is exceeded. However, do not use it for appliances that require higher amperage, as they will blow immediately.
Technical specifications
| Product Type | Fast-blow glass tube fuse |
| Rated current | 4A |
| Maximum voltage | 250V AC |
| Dimensions | 5 x 20 mm (diameter x length) |
| Tube material | Transparent glass |
| End cap material | Nickel-plated metal |
| Tripping type | Fast-blow |
| Set quantity | 100 pieces |
| Recommended applications | Power supplies, stabilizers, TVs, radios, transformers, electronic equipment |
| EAN Code | 0781499710259 |
Warranty and support
The product benefits from a 24-month warranty in accordance with current Romanian legislation, covering manufacturing defects. 30-day return policy for unused products in original packaging. Fast national courier delivery in 1-3 business days. For questions about compatibility or technical specifications, the CLASSLIGHTS team is available
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