Blue Sea Systems MRBF Terminal Fuses

Price:  £10.86   (£9.05 Exc. VAT)

Product code:  P03980
Brand:  Blue Sea Systems
Ignition Protected  Yes


These compact, space saving Marine Rated Battery Fuses (MRBF) are suitable for use on high amperage circuits such as primary battery feed, inverter, windlass, bow thruster, etc. They are available in 30-300A ratings and have a high interrupt capacity to satisfy the American Boat & Yacht Council (ABYC) requirements for DC main circuit protection on large battery banks. They are also ignition protected so are safe for use around petrol engines.

A clear window at the front of the fuse provides a visual confirmation that it has blown, and colour coded strips either side of the fusible link enable quick and easy identification of the current rating.

These fuses must only be used in conjunction with the Blue Sea Systems MRBF fuse blocks below:

Important: Not to be mounted directly to the battery terminal.

Sold individually.


  • Compact and space saving
  • Ideal for high amperage circuits
  • High interrupt capacity (10kA@14V)
  • Ignition protected
  • Clear window - visual indication of blown condition
  • Colour coded for current rating
  • 30-300A ratings
  • Voltage rating (max.): 58V DC
  • Current rating: 30-300A
  • Interrupt rating: 10kA@14VDC, 5kA@32VDC, 2kA@58VDC
  • Overall dimensions: 27.8 (L) x 16.3 (H) x 23.0 (W) mm
  • Ignition protected: Yes
  • Protection rating: IP66
  • Standards/specifications met: SAE J1171 Marine
  • Manufacturer's part no: 5175-5178, 5180-5187, 5189-5190

Part Number:  5181B-BSS

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Blue Sea Systems

Blue Sea Systems is a US-based company designing and manufacturing high-quality components and accessories for the demanding environments of the marine and specialised vehicle markets. Its range consists of over 1000 products, designed to work together as a fully integrated system.

Business Hours: Mon - Fri | 9am - 5pm
CALL Sales & Support: 01844 885100
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