Blue Sea MRBF Terminal Fuse Block - 30 to 300A

Was $45.00
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At 23:59 pm, 30 June 2024
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Blue Sea Single MRBF Fuse Block

For superior circuit protection in your DC Main, inverter, windlass, or bow thruster, look no further than Blue Sea's Marine Rated Battery Terminal Fuses (MRBF) Fuses. These compact, high-amperage fuses are expertly designed to provide high current protection, even in applications with tight space constraints.

These fuses stand out for their isolated stud design, which utilizes standard M8 hardware. This design allows for the stacking of terminals, making it a space-saving and highly efficient solution for your electrical system. Whether your space is limited or you simply seek an unobtrusive yet effective protection method, these fuses deliver.

In addition, when used with Blue Sea Systems' MRBF Terminal Fuse, these MRBF Fuses are ignition protected. This added layer of safety can give you peace of mind, especially in environments where ignition protection is a crucial concern.

Each fuse holder is also accompanied by an insulating cap, which serves to prevent accidental shorts. This means you can rely on the Blue Sea MRBF Fuses not just for their exceptional current protection, but also for their contribution to the overall safety of your system.

Step up the protection of your electrical system with Blue Sea's MRBF Fuses. (Note: Fuses are sold separately.)

Visit Blue Sea's Official Webpage about the MRBF Fuses


About the Blue Sea MRBF Series

Designed for the most demanding environments, the MRBF-XXX Series Marine Rated Battery Fuse offers high current protection even in the tightest space constraints. Suitable for main and auxiliary circuit protection applications, it can be used for alternator outputs, starter motor inputs, and accessory circuits. The breaking capacity meets the requirements of conventional vehicle batteries and 12V, 24V, and 48V electrical networks.

Operating Times

  • 200% Rating: > 100 h Max
  • 135% Rating: 900 sec max
  • 350% Rating: 60s min
  • 600% Rating: 0.1s - 1s max, <0.2s


Offering full-range circuit protection for automotive and marine applications. The break-in capacity meets the requirements of conventional vehicle batteries and 48V electrical networks.


  • Voltage Rating: 58Vdc Maximum
  • Maximum Amperage: 30A - 300A
  • Ingress Protection: IP66
  • Interrupt Rating:
    • 10000 AMP @ 14Vdc
    • 5000 AMP @ 32Vdc
    • 2000 AMP @ 58Vdc
  • Color Coded (see next page)
  • Terminal Stud: M8 (5/16")
  • Maximum Torque: 75 in-lb (8.47 Nm)
  • Weight: 0.16lb (0.07 kg)
  • Material:
    • Body - Ceramic
    • Housing & Cover: UL-rated 94V0 Thermoplastic
    • Ring Terminals - Tin Plated
  • Compliances: ISO 8820-6

Additional Features

  • CF Cover
  • CF Bar
SKU BS-5191B
Barcode # 632085051914
MPN # BS-5191B

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