Automotive Fuse, 1 A, Nonindicating, ATC Series, Not Rated, 32V DC, Fast Acting, Body Material Plastic, Nonrejection, Body Style Blade, Interrupt Rating 1kA at 32V DC, Color Code Black, Fuse Size 3/4 in L x 3/4 in W x 13/64 in D, Length 3/4 in, Width 3/4 in, Depth 13/64 in, Equivalent Brand and Series Bussmann ATC-ID, Littelfuse 257, Mersen AF, Equivalent Series 257, AF, ATC, Single Element, Standards UL Recognized Guide JFHR2, File E56412 Nonindicating automotive blade fuses open within seconds of being exposed to overloads and short circuits. They have no indicator for identifying a blown fuse, so they're sometimes used with an indicating fuse block or cover.Automotive blade fuses are the most commonly used type of automotive fuse for protecting electrical systems and components against.