Blue Sea Systems 5190BSS 300 Amp MRBF Terminal Fuse Gray

The Blue Sea Systems 5190BSS is a space-saving, marine-rated battery fuse (MRBF) designed for high-amperage DC circuit protection in marine, RV, and powersports applications. This 300-amp terminal fuse provides an ingenious and convenient way to achieve protection for high amperage wires directly off the battery while satisfying the ABYC 7" circuit protection rule.

Key Features:

• High interrupt rating of 10,000 Amperes at 14V DC, 5,000 Amperes at 32V DC, and 2,000 Amperes at 58V DC
• Maximum voltage rating of 58 Volts DC
• Meets SAE J1171 external ignition protection requirements for safe installation aboard gasoline-powered boats
• Rated IP66 - withstands water from heavy seas
• Clear window provides visual indication of blown condition
• Gray color-coded housing for easy 300-amp identification
• Compact 1" square by 1/2" high design

Installation Requirements:

Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151—do not mount the fuse directly to the battery terminal. Appropriate for DC main circuits, inverters, charge controllers, water pumps, windlasses, and bow thruster circuit protection.

The interrupt rating satisfies ABYC requirements for DC main circuit protection on large battery banks, making this an ideal solution for marine electrical systems requiring reliable overcurrent protection in compact installations.