BOJACK MRBF Terminal Fuse Block 250A Marine Battery Fuse Holder IP66 Waterproof, Stainless-Steel Studs

This dual MRBF-style fuse block is engineered for high-current DC systems where space is limited and environmental resistance matters. Built from heat-resistant thermoplastic with stainless steel studs and a clear PES fuse housing, the assembly combines robust conductivity with a sealed cap to reduce corrosion and accidental shorts.

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

The BOJACK MRBF fuse block interrupts excessive current to prevent wiring and component damage in 12–48V systems (rated to 58V DC max). Its 250A fuse element is nickel-plated copper-alloy for reliable conduction and predictable fuse performance under load.

• 250A MRBF fuse element for high-current interruption
• Nickel-plated copper-alloy fuse for low resistance and durability
• Ceramic insulation improves thermal stability and arc resistance
• Stainless-steel studs and hardware resist corrosion and heat

What makes this holder suitable for marine and harsh environments?

The unit carries an IP66 protection rating and includes a waterproof, dustproof cap that shields the terminal from spray and debris. Combined with corrosion-resistant studs and a thermoplastic body, the block resists typical marine stresses like salt, vibration, and temperature swings.

• IP66-rated housing keeps out heavy spray and dust
• Waterproof cap reduces risk of accidental shorting and contamination
• PA66-RG301 thermoplastic body withstands heat and mechanical strain
• Stainless-steel studs and nuts provide long-term corrosion resistance

How do I install and size this fuse block for my system?

Mounting is straightforward: the block uses M10 (3/8") mounting holes and M8 (5/16") studs for battery or busbar connections. Choose the correct MRBF amperage for your circuit — this product ships with a single included 250A fuse unless you select a different rating at purchase.

• Mount with M10 (3/8") fastener for secure attachment
• Connect battery or inverter cables to M8 (5/16") studs
• Select fuse amperage to match cable and device ratings before buying
• Includes washer, lock washer, hex nut and red insulating cap

What materials and parts are used for electrical performance and safety?

The BOJACK fuse block pairs high-quality insulating and conductive materials to balance safety with low electrical loss. A ceramic fuse insulation combined with a thermoplastic base and nickel-plated copper alloy fuse ensures stable performance under demanding loads.

• Ceramic insulation for heat resistance and reduced arcing
• PA66 thermoplastic body for mechanical strength and temperature tolerance
• Nickel-plated copper-alloy fuse for excellent conductivity
• PES clear fuse housing for visual inspection of the fuse element

Who this is for: The BOJACK MRBF 250A terminal fuse block is aimed at boat owners, RV and motorhome builders, electricians, and anyone working on DC power systems that demand compact, high-current protection in exposed or damp environments. It’s particularly useful where reliable conductivity, corrosion resistance, and a waterproof safety cap are required in tight installation spaces.