Blue Sea Systems 5045 ST Blade Fuse Block Compact 4 Circuit with Cover. Blue Sea Systems Fuse Block ST Blade Compact 4 Circuit with Cover part number 5045 is a common source fuse block that provides surface mount circuit protection for ATO®/ATC® fuses in a compact footprint. Max Amps: 100A per block 30A per circuit Max Volts: 32V DC Mounting :#8 Screw (M4) Recommended stud torque: 24 in-lb Screw Terminal Torque: 18in-lb Screw terminal type: #8-32 screws with captive star lock washer terminal stud size: #10-32. Single side design allows wire entry from one side to maximize space. Ignition protected when cover is secure –meets ISO 8846 and SAE J1171 for use in a gasoline engine compartment. Clear insulating cover meets ABYC/USCG insulation requirements. Includes 4 write-on circuit labels. Fuses sold separately.