Fast-Acting Fuse 4A, Ceramic, Fusible, 5x20mm, Set of 100 pcs
Available in stock
| Quantity | Price per unit | You save |
|---|---|---|
| 1–2 pcs | 42,99 lei | — |
| 3–4 pcs | 40,84 lei | 5% (−2,15 lei/unit) |
| 5–10 pcs | 38,69 lei | 10% (−4,30 lei/unit) |
| 11+ pcs | 36,54 lei | 15% (−6,45 lei/unit) |
4A 5x20mm Fast Ceramic Fuse for Equipment Protection
Set of 100 fast-acting ceramic fuses, ideal for protecting power supplies, LED equipment, and electronic devices against overcurrent and short circuits. Standard 5x20mm size, compatible with most household and industrial devices requiring 4A protection.
What you get with this product
- Fast overcurrent protection — instantly interrupts the circuit when exceeding 4A, preventing damage to expensive equipment
- Complete set of 100 pieces — sufficient stock for long-term maintenance, ideal for workshops, service centers, or intensive home use
- Universal compatibility — standard 5x20mm size, mounts in any classic fuse holder
- Durable ceramic construction — withstands high temperatures without cracking, more reliable than glass variants
- Wide applicability — suitable for power supplies, stabilizers, televisions, audio equipment, transformers, and LED lighting systems
- Exceptional value for money — bulk purchase at an affordable price, reducing maintenance costs
How it works and how to install
The fuse is installed in the dedicated holder of the electrical appliance, in series with the power supply circuit. The internal metal conductor wire melts instantly when the current exceeds 4A, interrupting the circuit and protecting the components. Replacement is simple: disconnect the appliance from the mains, remove the blown fuse from the holder, and insert a new one, observing the same amperage value.
The fuse's condition can be visually checked through the metal caps or with a multimeter set to continuity. Never replace with higher amperage fuses — risk of fire and equipment damage.
Frequently Asked Questions
Can I use these fuses for 12V LED lighting systems?
Yes, they are perfect for protecting LED power supplies and drivers that operate at 12V or 24V, as long as the consumption does not exceed 4A.
What is the difference between a fast and a slow-blow fuse?
A fast-blow fuse trips instantly when the nominal current is exceeded, making it ideal for sensitive electronic equipment. A slow-blow fuse tolerates a short current surge at startup, used for motors or transformers.
How do I know if the fuse has blown?
Visually, the internal metallic wire will be broken, visible through the ceramic capsule. For a reliable check, use a multimeter on the continuity function — a good fuse will show almost zero resistance.
Technical Specifications
| Product Type | Fast ceramic fuse |
| Nominal Current | 4A |
| Maximum Voltage | 250V AC |
| Dimensions | 5 x 20 mm |
| Housing Material | Ceramic |
| End Cap Material | Nickel-plated metal |
| Action Type | Fast blow (F) |
| Standard | IEC 60127 |
| Package Quantity | 100 pieces |
| Applications | Power supplies, LED equipment, electronics, stabilizers |
Warranty and Support
The product benefits from a 24-month warranty according to current Romanian legislation. Right of return within 30 days of purchase. Fast delivery via national courier with telephone confirmation. For technical assistance, contact the CLASSLIGHTS team.
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