BOJACK 300A Marine Battery Fuse Holder 58V DC IP66 Waterproof, Stainless Studs & Ceramic Insulation

BOJACK 300A Marine Rated Battery Fuse 58V DC Max IP66 Waterproof Fuse Holder is a compact, marine-grade terminal fuse block that protects high-current DC circuits up to 58V while resisting water and dust.

This heavy-duty fuse holder is engineered for boat, RV, and off-grid DC systems where space is limited but reliable high-current protection is required. Constructed from heat-resistant thermoplastic with stainless steel studs and ceramic insulation, it accepts a 300A MRBF-type fuse and includes a waterproof cap to help prevent shorts and environmental damage. The design focuses on durability, electrical conductivity, and easy installation on battery terminals or distribution blocks.

How does this fuse holder protect high-current DC systems?

The BOJACK fuse holder interrupts excessive current flow using a 300A MRBF fuse element rated for up to 58V DC. When current exceeds the fuse rating, the element melts and opens the circuit, helping prevent wiring damage and component failure.

• Includes one 300A MRBF fuse made from nickel-plated copper alloy for reliable conduction.
• Ceramic insulation and PES clear housing reduce risk of arcing and withstand heat.
• Stainless steel studs and nuts maintain strong electrical contact and resist corrosion.

What makes it suitable for marine and outdoor environments?

The holder is built to resist the challenges of wet and dusty environments with an IP66 protection rating and a waterproof cap that seals the fuse assembly. Materials are selected to tolerate temperature variation and salt air without rapid degradation.

• IP66-rated enclosure resists heavy splashing and dust ingress for rugged outdoor use.
• Waterproof red insulating cap prevents accidental shorts and shields the terminal.
• PA66 thermoplastic body and stainless steel hardware resist corrosion in marine settings.

How easy is installation and what mounting options are there?

Installation is straightforward for anyone familiar with DC battery systems; the holder mounts using an M10 (3/8") mounting hole and connects with M8 (5/16") studs. The compact footprint lets you place it near inverters, bow thrusters, or battery banks where space is tight.

• Stud size: M8 (5/16") for secure cable lugs; mounting hole: M10 (3/8") for panel attachment.
• Package includes washer, lock washer, hex nut, and insulating cap for quick setup.
• Compact form factor fits DC mains, inverter leads, motorhome and marine circuits.

What materials and specifications ensure reliable conductivity?

Conductivity and thermal performance are prioritized with nickel-plated copper alloy fuse elements and stainless steel studs. Ceramic insulation and a PES fuse housing help contain heat and reduce electrical leakage.

• Fuse material: nickel-plated copper alloy, 2.5mm thickness, silver finish for low resistance.
• Body material: PA66-RG301 thermoplastic; studs: stainless steel for durability.
• Fuse housing: clear PES plastic; insulation: ceramic for thermal stability.

Who is this for? The BOJACK 300A marine-rated fuse holder is intended for boat owners, RV enthusiasts, electricians, and technicians who need dependable, high-current DC protection in exposed or compact installations. It’s a practical choice for protecting inverters, thrusters, hoists, or any 12–48V (up to 58V) DC circuits where a robust, water-resistant fuse block and clear visual access to the fuse are priorities. Select the appropriate amperage when ordering, and note that each unit ships with one MRBF fuse included.