How To Find Out Your Ceramic Fuse Is Blown

Testing a ceramic fuse is the only way to tell if the fuse has blown.

How to find out your ceramic fuse is blown.

If you have glass fuse you can easily see if fuse is burned or not for ceramic types you will need continuity checker multimeter ohmmeter for continuity checker put fuse on black and red lead and if you hear beep than your fuse is ok if theres no beep fuse is burned for multimeter ohmmeter set multimeter to ohm setting closest to 1ω and put one lead on each end of the fuse and look at the display if the meter shows a less than 1ω then the fuse should be okay if it show that theres no. It is a quick and easy way t. A ceramic fuse however shows no damage upon visual inspection. Turn off the power supply to the appliance or other electrical device if the device is hard wired.

Hold it up to the light and look closely inside for a thin wire that connects the 2 sides of the fuse. If you see a thick wire that has a very small spring at one end you will know it is a slow blow fuse. To check a ceramic fuse use an ohmmeter or continuity tester. It depends on what you mean by good.

If there is a thin wire you have a fast blow fuse. The fuse should have less than an ohm of resistance across its terminals. With an ohmmeter or multimeter you should see a reading close to zero ohms if the fuse is intact or infinite if it s blown. I use a very simple visual check to tell if they re blown.

You may need to use a magnifying glass to see the fuse details if it is small or in an inaccessible location. Ceramic fuses act as a safety device that interrupts the electrical power supply when electrical overloads or surges occur. I ve checked fuses before by removing the cap on a flashlight and holding the fuse to the cap. If the wire is broken or if you see charred marks the fuse has blown.

If a continuity tester indicates continuity when you touch its lead to the ends of the fuse it s good. Look through the tube of the fuse glass and check the wire filament within. If the appliance has a plug unplug the power cord. If by good you want to check the fuse to see if it s really going to blow at its rated current i m not aware of any.

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. This is a quick video that i made to show you how to check car fuses. Testing a ceramic fuse is the only way to tell if the fuse has blown. If you want to see if the fuse has blown then you can just use the continuity test setting or check resistance.