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Blue Sea Systems 300A MRBF Terminal Fuse (5190B)

£16.58
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Protect your high-capacity battery bank and heavy-duty DC electronics with the Blue Sea Systems 300A MRBF Terminal Fuse (5190B). Designed for space-saving installation, this compact Marine Rated Battery Fuse delivers heavy-duty circuit protection for high-draw inverters, bow thrusters, and main power feeds. Rated for up to 58V DC and featuring an ignition-protected design, it provides high interrupt capacity protection required for modern marine, RV, and off-grid power installations.

High-Amp Main Protection: Rated for 300A continuous current to protect heavy DC loads, large inverters, and main power feeds. High Interrupt Capacity: Delivers up to 10,000A interrupt rating to satisfy rigorous ABYC standards for primary battery bank protection. Ignition Protected Safety: Safe for installation in engine compartments and gas-powered marine environments without sparking hazards. Clear Inspection Window: Built with a transparent window for instant visual indication of a blown fuse condition. 58V DC Max Rating: Compatible with 12V, 24V, and 48V battery systems, giving you maximum flexibility for marine, RV, and solar builds.
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SKU: 5190B
Product Details
Safeguard your vessel or overland rig against catastrophic electrical shorts with the Blue Sea Systems 300A MRBF Terminal Fuse. Engineered specifically for high-amperage main DC circuits, this Marine Rated Battery Fuse (MRBF) provides compact, ultra-reliable protection directly at your battery bank.
High-Interrupt Capacity for Large Battery Banks
Large battery banks can discharge extreme levels of current during a direct short circuit. The 5190B fuse features a high interrupt rating (up to 10,000A @ 14V DC and 2,000A @ 58V DC), meeting strict ABYC requirements for primary DC main circuit protection. Whether you are running a 12V, 24V, or 48V power setup, this 300A fuse ensures your system shuts down safely before damage occurs.
Ignition Protected & Built for Extreme Conditions
Designed for marine engine rooms and gasoline-powered boats, this fuse is fully ignition protected to prevent open sparks from igniting fuel vapors. Its rugged housing stands up to harsh marine and off-road environments, making it an essential safety component for marine vessels, commercial vehicles, and off-grid solar systems.
Instant Visual Troubleshooting
Never guess whether a fuse has blown. The 5190B features a clear window housing that allows for instant visual inspection of the internal fuse element. Combined with color-coded amperage identification, checking and maintaining your battery fuses is fast and effortless.

(Please note: MRBF fuses require the use of a compatible Terminal Fuse Block, such as Blue Sea Systems PN 5191 or PN 2151, and should not be mounted directly onto a battery stud without a fuse block.)
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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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