Ceramic Fuse Markings

For more information on other markings found on fuses see the fuses.

Ceramic fuse markings.

Also what the meaning of various letter number combinations on circuit boards or labels. The more thermally stable fuse is typically filled with sand in order to prevent the conductive film from forming. Figure sf1 compares the multi layer design of our sff fuses with standard glass coated designs. What is the fuse marking according to iec standard 127 and how does this translates to littelfuse s 5x20mm fuse offerings.

It s essential that you replace a blown fuse with another of the same type. I ve had a few enquiries about coloured bands on fuses and what value is denoted by the colours etc. Fortunately few porcelain insulator styles u numbers have both dry process specimens with an embossed marking and wet process specimens with one of the other marking types. Please see the attached file.

Fuses come in many types and sizes including glass fuses which may be slow blow fuses or fast acting fuses. 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. Element surface area to the glass ceramic absorption material. A ceramic fuse is built to withstand high temperatures.

Contact us at 1 800 909 fuse 3873 to discuss your fuse. When replacing a lucas fuse with a non lucas glass type fuse you use the smallest rating for the new. Where many people go wrong is confusing the continuous fusing rating where the fuse pops with the smaller rating of continuous amps which is where fuse operates normally. Glass fuse markings can provide a lot of information about the type of fuse so you know what to replace it with.

The only embossed marking on multipart porcelain insulators is the typical but much larger o b used by ohio brass on its unipart styles. If you want to know why you need a fuse or why to replace with the correct one see the fuses what and why page. When the fuse elements open there is more material for the vaporizing fuse metals to absorb into resulting in a very efficient and effective quenching of the fuse arc.