Ceramic Fuse Markings

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

Ceramic fuse markings.

I ve had a few enquiries about coloured bands on fuses and what value is denoted by the colours etc. What is the fuse marking according to iec standard 127 and how does this translates to littelfuse s 5x20mm fuse offerings. Figure sf1 compares the multi layer design of our sff fuses with standard glass coated designs. The only embossed marking on multipart porcelain insulators is the typical but much larger o b used by ohio brass on its unipart styles.

These are ceramic barrel fuses similar to the bosch style. 5x20mm iec fuse marking. 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.

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. A ceramic fuse is built to withstand high temperatures. 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.

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. Glass fuse markings can provide a lot of information about the type of fuse so you know what to replace it with. It s essential that you replace a blown fuse with another of the same type. 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.

When replacing a lucas fuse with a non lucas glass type fuse you use the smallest rating for the new. Contact us at 1 800 909 fuse 3873 to discuss your fuse. The more thermally stable fuse is typically filled with sand in order to prevent the conductive film from forming.