Blue Sea Systems Dual MRBF 30 to 300A Terminal Fuse Block

These are awesome!  I used these on my last 12v upgrade.  I always fuse as close the battery as I can.  You mount the block directly to the positive battery post, then install the fuse and your cable.  You can’t get a fuse any closer without this kind of protection.

Here is a link to my blog post.



  • New isolated stud design uses standard M8 (5/16″) hardware and permits stacking of terminals
  • Compact, high-amp fuse-Appropriate for DC Main, inverter, windlass and bow thruster circuit protection
  • Provides high current protection in tight space constraints
  • Weatherproof-suitable for small open-cockpit boats and other harsh environments

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