What Does A Blown Ceramic Fuse Look Like

The t does indicate that it is a slow blow fuse.

What does a blown ceramic fuse look like.

If the fuse is open then the next step is determining what caused the fuse to blow. This is necessary for ceramic fuses since they don t develop a blackened appearance like blown glass fuses. A ceramic fuse however shows no damage upon visual inspection. Check one cap on fuse pcb or manual for fuse ratings there should be written something like.

A ceramic fuse is built to withstand high temperatures. The film is formed when a short circuit melts the fuse element causing a deposit to be seen on the inside of the fuse barrel as a film. To do this use a voltmeter ohmmeter. T2a250v f1a250v that s fuse rating t is for slow blow fuse and f for fast blow fuse 2a or 1a is amperage rating its usually just number and a 250v is voltage rating its number and v and then just measure the size of fuse in small electrical device is.

These look like a single piece of wire which can be as thin as a hair for small amperage ratings. A slow blow fuse is typically selected to protect circuits that have high inrush currents such as motors and high current power supplies that have a big bump of current on startup. The more thermally stable fuse is typically filled with sand in order to prevent the conductive film from forming. These fuses are designed to protect individual components of a system instead of one fuse protecting the entire item.

If it still does nothing it needs service. You need to test whether the ceramic fuse has blown. A homeowner can determine if a glass fuse in blown by performing a visual inspection and looking for a break in the thin wire and a brown discoloration in the center of the fuse. They are very small and look like a tiny silver candy bar.

If it doesn t blow with the slow blow installed then it may be have been a case of fuse fatigue with the original fuse especially if it all works when you connect everything. It still might blow with a slow blow fuse installed but at least you know that the correct type of fuse was in circuit. If the fuse seems stuck use pliers for this. If you have a blown fuse take a look at the other circuitry without touching it.

Testing a ceramic fuse is the only way to tell if the fuse has blown. Make sure not to induce too much pressure or you might harm the conducting surface of the fuse.