153.5631.5501 Fuse, Automotive, Slow Blow, 50 A, 32 V. The BF1 series Fuse Link made of thermoplastic body with tin-plated copper alloy galvanized terminals. It offers a bolt-on fuse for high current wiring protection. The current rating is 23 to 200A. It is transparent housing material for easy detection of blown fuses.