Blue Sea 5191 MRBF Terminal Fuse Block – 30 to 300A


Compact, high-amp rated MRBF/CBBF fuse holder. Designed to mount direct to batteries with 3/8″ posts for easy installation. Rated for 300A maximum.

  • Compact, high-amp fuse—appropriate for DC Main, inverter, windlass, and bow thruster circuit protection
  • Provides high current protection in tight space constraints
  • Ignition protected when used with Blue Sea Systems’ MRBF Terminal Fuse
  • Isolated stud design uses standard M8 hardware and permits stacking of terminals
  • Insulating cap prevents accidental shorts
  • Accepts 5∕16″ ring terminals
  • Mounts on 3/8” terminal studs
  • Fuse sold separately
Weight 0.16 lbs
Dimensions 2.4 × 0.79 × 1.75 in

Blue Sea Systems

Component Type

Fuse Block

Fuse Type


System Voltage

12V, 24V


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