BOJACK MRBF Terminal Fuse Block 125A Battery Fuse Holder — Marine‑Rated IP66 Waterproof

The BOJACK MRBF Terminal Fuse Block is a compact, marine-rated 125A battery fuse holder that protects high-current 58V DC circuits while resisting water and dust.

This dual-terminal fuse block is engineered for demanding DC power systems where space is limited and environmental exposure is a concern. Built from heat-resistant thermoplastic with stainless steel studs and a ceramic-insulated fuse, the unit pairs reliable conductivity with IP66 protection. It ships with one 125A MRBF fuse, a waterproof insulating cap, and mounting hardware so you can install a secure main-DC protection point on boats, vehicles, inverters, and industrial equipment.

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

The MRBF fuse interrupts excessive current before wiring or devices overheat, safeguarding batteries, inverters, and motors. The ceramic-insulated fuse element and nickel-plated copper alloy provide stable conductivity and rapid interruption under fault conditions. Stainless steel studs and high-temperature thermoplastic resist corrosion and mechanical stress for long-term service.

• 125A fuse rating for heavy DC loads up to 58V
• Ceramic insulation reduces thermal stress during interruption
• Nickel-plated copper alloy fuse material for low resistance
• Stainless steel studs and nuts for corrosion resistance

Why is IP66 waterproofing important for marine and outdoor installations?

IP66 classification means the housing keeps out strong jets of water and prevents dust ingress, crucial for coastal and exposed installations. The included waterproof cap further reduces the risk of accidental shorts from splashes or debris. Together these features help maintain reliable protection in wet, salty, or dusty locations.

• IP66-rated enclosure resists heavy spray and dust
• Waterproof insulating cap prevents inadvertent contact
• Thermoplastic body stands up to UV and humidity

What installation details should I know before fitting it?

The block mounts using an M10 (3/8") terminal hole while the studs accept M8 (5/16") ring terminals, so it integrates with common battery cable hardware. A single MRBF fuse is supplied; select the amperage you require prior to purchase if other ratings are needed. Tighten stainless hardware to recommended torque values and use the washer and lock washer included for secure attachment.

• Stud size: M8 (5/16") for ring terminals
• Mounting hole: M10 (3/8") for secure base fixing
• Includes washer, lock washer, hex nut, and one 125A fuse
• Body material: PA66 thermoplastic for heat resistance

Which applications are best suited to this MRBF fuse holder?

This fuse block is designed for compact protection of main DC feeds where high current and environmental exposure coincide. It works well as a main battery fuse on boats, as protection for inverters and bow thrusters, or in compact vehicle and RV power systems. Its small footprint and rugged construction make it adaptable to industrial and renewable-energy setups too.

• Marine power systems: small boats to larger vessels
• DC inverters, motorhomes, and automotive applications
• Cranes, hoists, bow thrusters, and renewable installations

Who is this for? If you need a durable, compact main battery protection device for 58V DC circuits that withstands wet or dusty conditions, the BOJACK MRBF 125A Terminal Fuse Block is designed for installers, marine technicians, RV owners, and system integrators who value corrosion resistance, easy mounting, and clear electrical ratings. It’s particularly useful when space is tight but reliable, high-current protection is required.