Fast Blow Glass Fuse 5x20mm 0.315A (F5x20)
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Prices updated: 14 Oct 2026
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About this product
A 5x20 mm glass-body fast-blow fuse rated at 0.315 A, used to protect electronic circuits and power supplies from overcurrent. A fast-blow element opens quickly when the current exceeds its rating, which suits sensitive semiconductor circuits. A blown fuse should only be replaced with one of the same rating and type.
Specifications
- Type
- Fast blow
- Size
- 5 x 20 mm
- Current rating
- 0.315 A
- Body
- Glass
Frequently asked questions
Can I replace it with a higher current rating?
No. A higher rating lets more current flow before the fuse opens, which defeats the protection. Always replace it with the same rating and type.
Should I use a slow-blow fuse instead?
Only if the circuit is designed for it. Fast-blow fuses respond quicker to overcurrent and are generally preferred for protecting sensitive electronics; slow-blow types tolerate short inrush currents, such as motor start-up.
