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Blue Sea Systems 5191B MRBF Terminal Fuse Block (30-300A)

£29.22
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Protect your high-current DC circuits right at the battery with the Blue Sea Systems 5191B MRBF Terminal Fuse Holder. Engineered for tight spaces, this compact fuse block mounts directly onto a 3/8" battery stud, providing robust protection for DC mains, inverters, windlasses, and bow thrusters. Supporting up to 300A and 58V DC, it features an isolated stud design and a protective insulating cap to prevent accidental electrical shorts.

Direct Battery Mount Protection: Secures directly onto 3/8" terminal studs, providing high-amp circuit protection right at the power source without taking up valuable board or wall space. High-Capacity Performance: Accommodates fuses from 30A to 300A and handles up to 58V DC, making it suitable for 12V, 24V, and 48V battery systems. Short-Circuit Safeguard: Includes a protective insulating cap that covers live metal parts to prevent accidental shorts and spark hazards in crowded battery compartments. Flexible Ring Terminal Stacking: The isolated M8 stud design allows secure stacking of standard 5/16" ring terminals for clean, organized cable routing. Ignition Protected Safety: Meets strict marine standards for ignition protection when used with Blue Sea Systems MRBF fuses, making it safe for boat engine rooms and enclosed battery boxes.
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SKU: 5191B
Product Details
Upgrade your battery bank protection with the professional-grade Blue Sea Systems MRBF Terminal Fuse Holder (5191B). Designed to deliver heavy-duty circuit protection where space is at a premium, this space-saving fuse block attaches directly to your battery terminal, eliminating the need for extra cables or mounting brackets.
Compact High-Amp Power Protection
Whether you are wiring an off-grid solar array, marine vessel, or overland vehicle, protecting high-amp circuits is critical. The 5191B fuse holder accepts Marine Rated Battery Fuses (MRBF) ranging from 30A to 300A, making it the ultimate safeguard for main DC feeds, high-draw inverters, anchor winches, and thrusters.
Smart, Stackable Terminal Design
Featuring an isolated M8 (5/16") stud, this terminal fuse block allows you to stack ring terminals cleanly and securely without compromising connection integrity. It accepts standard 5/16" ring terminals, making integration into your existing 12V, 24V, or 48V wiring setup simple and straightforward.
Engineered for Safety & Peace of Mind
Safety is paramount around high-capacity battery banks. The 5191B comes equipped with a flexible, high-visibility insulating cap that shields live components from accidental tool contact or loose metal objects. When paired with genuine Blue Sea Systems MRBF fuses, the assembly is ignition protected, ensuring safe operation in engine compartments and gas-powered marine environments.
(Please note: MRBF fuses are sold separately.)
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Tracked Delivery (Currently 1-3 business days):

  • Free over £250.
  • £4.99 for small packages (Under 0.8kg)
  • £5.99 for orders under £250.
  • £5.99 for orders under £50.

Next Business Day Delivery:

  • £9.99 Flat Rate.

Collection:

  • Free to collect from our warehouse.

Pre-Order:

  • 5-10 Business Days delivery unless otherwise stated.

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