MRBF Terminal Fuse Block - 30 to 300A - Blue Sea Systems Use the Blue Sea Systems Circuit Wizard to select the correct wire size, circuit breaker or fuse type and amperage, and fuse holder. Get Started > The Circuit Wizard app is available for Android™ devices & iOS devices. Panel Wizard. Use the Blue Sea Systems Panel Wizard to design and order a Custom 360 Panel. Get Started > Amazon: 300a fuse ANJOSHI 300 Amp Circuit Breaker 20A-300A with Manual Reset Waterproof Inline Fuse Inverter for Marine Trolling Motors Boat ATV Manual Power 12V-36VDC 3.9 out of 5 stars 148 $22 $ 22 . 99 ANL Fuse Block with Insulating Cover - 35 to 300A - Blue Accepts 5/16" (M8) ring terminals. For use on systems up to 32 Volts DC. Swing out design allows replacement of the fuse without removing fasteners. Stainless steel studs provide resistance to corrosion and high torquing for excellent electrical contact. UL 94-V0 base resists high heat.