BOJACK MRBF 200A Marine Battery Fuse Block — IP66 Waterproof, Stainless Studs & Ceramic Fuse

BOJACK MRBF Terminal Fuse Block is a compact, marine-rated 200A battery fuse holder with IP66 waterproof protection designed for high-current DC systems up to 58V.

This heavy-duty fuse block combines a small footprint with robust materials to protect main battery feeds, inverter inputs, bow thrusters and other high-current DC circuits. Built from PA66 thermoplastic with stainless-steel studs and a ceramic-insulated fuse, it delivers reliable conductivity and environmental resistance for marine, automotive and industrial installations. The kit ships with a waterproof insulating cap and hardware so you can fit it directly to a battery bus or chassis mounting point.

How does this fuse block protect high-current DC circuits?

The MRBF design interrupts excessive current flows at a dedicated fuse element, preventing wiring or device damage from sustained overcurrent. Its nickel-plated copper alloy fuse element and stainless mounting studs offer low resistance and rapid heat dissipation under load. The ceramic insulation adds thermal stability during fault conditions.

• Rated for 200A continuous current with a maximum 58V DC voltage rating.
• 2.5mm thick copper-alloy fuse element with nickel plating for corrosion resistance.
• Stainless-steel studs (M8) and M10 mounting hole for secure connections.
• Ceramic and PA66 thermoplastic body for thermal and mechanical durability.

What environmental protection does the holder provide?

The unit meets IP66-level protection for ingress resistance, keeping dust and strong water jets away from the electrical contacts. A fitted waterproof insulating cap prevents accidental shorting and significantly lowers moisture exposure to the fuse and terminals. Materials are selected to withstand marine atmospheres and high-humidity conditions.

• IP66 rating resists dust and high-pressure water spray.
• Clear PES plastic fuse housing for visual inspection without removal.
• Removable red insulating cap protects terminals when not in use.
• PPS/PA66 thermoplastic body tolerates temperature and vibration.

How easy is installation and what hardware is included?

The block is designed for straightforward terminal or surface mounting in cramped equipment bays and boat compartments. It uses common metric stud sizes so you can mate ring terminals or bus bars quickly. Each package includes the basic mounting hardware and one matching MRBF fuse; choose the amperage option before ordering if different ratings are offered.

• Stud size: 5/16" (M8) for ring terminal connections.
• Mounting hole: 3/8" (M10) for secure chassis attachment.
• Package contents: dual MRBF block, red insulating cap, washer, lock washer, hex nut, and one 200A fuse.
• Compact footprint fits in tight DC mains, inverter and bow thruster spaces.

Who is this for: installers, boat owners, RV and vehicle electricians, and system integrators who need a dependable, space-saving main battery fuse solution. If you manage high-current 12–48V DC systems and require corrosion-resistant hardware with clear visual inspection and IP66 protection, this BOJACK MRBF 200A fuse block is built for in-field use where reliability and compact mounting matter.