They push-fit into fuse holders or boxes and are held in place by friction. The 30mm & 32mm fuses are generally interchangeable because the springs in the holders accommodate the small difference in length.īlade fuses are now the most commonly used category of fuses with almost every new vehicle featuring one or more of the different types. These fuses are normally used in fuse holders that screw or twist-lock together. Generally now used in lower current applications such as audio head units and accessories (cigar lighter socket plugs etc.) 20mm fuses are 5mm in diameter and 30 & 32mm fuses are 6.4mm in diameter (1/4"). Older style fuses with a glass body and metal end caps joined to the fusible link inside, with the number referring to the overall length of the fuse. There are several types of fuse currently in use in the automotive market and the table below gives a brief description of each: For example, if the normal expected current draw is 10A and the cable size is 25A, then a fuse rated at 15A would be appropriate. >The fuse rating should lie somewhere between these two values to allow normal operation but blow on overload.
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