Ceramic Fuse Markings

Fuses come in many types and sizes including glass fuses which may be slow blow fuses or fast acting fuses.

Ceramic fuse markings.

It s essential that you replace a blown fuse with another of the same type. What is the fuse marking according to iec standard 127 and how does this translates to littelfuse s 5x20mm fuse offerings. These are ceramic barrel fuses similar to the bosch style. Glass fuse markings can provide a lot of information about the type of fuse so you know what to replace it with.

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. The more thermally stable fuse is typically filled with sand in order to prevent the conductive film from forming. 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. When replacing a lucas fuse with a non lucas glass type fuse you use the smallest rating for the new.

A ceramic fuse is built to withstand high temperatures. 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. I ve had a few enquiries about coloured bands on fuses and what value is denoted by the colours etc. Contact us at 1 800 909 fuse 3873 to discuss your fuse.

Also what the meaning of various letter number combinations on circuit boards or labels. The only embossed marking on multipart porcelain insulators is the typical but much larger o b used by ohio brass on its unipart styles. Element surface area to the glass ceramic absorption material. 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.

Our warehouse contains a vast fuse inventory which means we usually have what you need in stock but if we don t the fuse can be drop shipped directly to your facility in a timely manner same day if necessary. 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. Please see the attached file.