Bussmann ANN-50 Very Fast Acting Fuse, 50 A, 125 VAC/80 VDC, 2.5/2.7 kA Interrupt

Circuit limiters typically used in fork lifts, marine, aviation and battery charging systems. ANN limiters are very fast-acting. ANN limiters measure 7/8 x 3-3/16 in with a depth that varies by amp rating.