Blue Sea Systems ST Blade Compact 4 Circuit Fuse Block Blue Sea Systems Compact Fuse Blocks provide surface mount circuit protection for ATOATC fuses in a compact footprint. Includes a cover and four write-on circuit labels. The insulating cover meets ABYCUSCG insulation requirements. Ignition protected when cover is secure - meets ISO 8846 and SAE J1171 for use in a gasoline engine compartment Single side design allows wire entry from one side to minimize footprint Tin-plated copper buses and f