A 1A fast-blow glass fuse in the common 5x20mm size, also called M205. It fits the standard 5x20mm fuse holders found in power supplies, amplifiers, test gear, 12V accessories and project boxes. The clear glass lets you see at a glance whether the wire inside is still whole, and a fast-acting fuse opens quickly on a short or overload to protect the wiring and parts behind it.
Specifications
What's in the box
Sold per fuse with a minimum of 5. You receive the quantity you order, loose in a clear bag.
Great for
Wiring & getting started
- Check the size and rating
Measure the old fuse: 20mm long and 5mm across is this size. Replace like with like: the same current, the same speed (F for fast, T for slow) and a voltage rating at least as high as the circuit.
- Size it for a new circuit
Pick a fuse above the circuit's normal current, so this 1A fuse suits loads up to about 0.75A. If it blows every time you switch on a motor or transformer, the circuit needs a slow-blow fuse rather than a bigger fast one.
- Fit it in a holder
Use a 5x20mm fuse holder in the positive or active line, as close to the power source as you can. Turn the power off before changing a fuse.
- Checking a blown fuse
A blown fuse has a broken wire or a darkened, smoky glass. A dark glass means a hard short, so find the fault before you fit a new one.
Note: Glass fuses suit electronics and low-voltage DC work. When replacing a fuse inside mains equipment, match the original exactly; if it was a ceramic or sand-filled fuse, use the same type, not glass.