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Blue Sea Systems MRBF Terminal Fuse Blocks

Blue Sea Systems MRBF Terminal Fuse Blocks

Q: Does this item come with the fuse terminal included? If so, how do I specify the amperage

I just ordered three of these - they each came with a 300A fuse. I was not expecting fuses to be included, so I had ordered them separately. If this is not a shipping/packaging mistake, it would be nice if the seller gave the option to choose a fuse size. While I can use a 300A on one of the terminals, I needed smaller ones for the others. I didn't buy them weeks ago because of the relatively high price of these fuses (typically ~$15 each). They were on sale for $10, so I got them now.

Q: I have a new 100ah 12v lifepo battery. what fuse size do i need to go with this?

At solavanbuild, I use 150 amp fuses with 1/0 AWG battery cables in most of my installs.

Q: I'm thinking of running a charge/power wire of the alternator to a trailer battery. Would it be OK to use this off the charge lead on the alternator?

I would recommend an automatic Charing Relay ACR. Blue sea makes great ones. I use their Mini-ACR because my boat alternator is less than 65A. Their standard handles up to 300A. Remember regardless, you will need TWO of these fuses, one at each battery. If your alternator puts out 60A then 75A fuses, if it puts out 100A than 130-150A fuses.

Product ID: 269370263

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Details

Current rating
300 Amps
Connector type
Screw
Number of contacts
10
Mounting type
Panel Mount
Material
Plastic

⚡High-amp fuse for powerful protection

🔩Standard M8 hardware for stacking

🌧️Weatherproof for harsh environments

Frequently Bought Together

Description

⚡ Power up your marine circuits with confidence and style!

UNIVERSAL COMPATIBILITY - Supports 5/16" or 3/8" ring terminals, making integration effortless and flexible.
WEATHERPROOF DURABILITY - Built to brave open-cockpit boats and harsh marine conditions without missing a beat.
STACKABLE TERMINAL DESIGN - Innovative isolated stud with standard 5/16" hardware lets you build a sleek, space-saving power hub.
ACCIDENTAL SHORT PREVENTION - Insulating cap ensures your system stays safe from unexpected shorts—peace of mind included.
COMPACT HIGH AMP PROTECTION - Engineered for DC Main, inverter, windlass, and bow thruster circuits—powerful defense in tight spots.

Blue Sea Systems MRBF Terminal Fuse Blocks deliver compact, high-amp circuit protection with a stackable isolated stud design using standard M8 hardware. Weatherproof and insulated for safety, they are ideal for DC Main, inverter, windlass, and bow thruster applications in demanding marine environments.

Specifications

Color	Single Fuse
Size	2.40'' x .79''
Style	1 Fuse
connector-type	Screw
Length	3 inches
Weight	0.5 Pounds
Material Type	Plastic
Number of Items	1
Batteries Included?	No
Brand	Blue Sea Systems
Department	Battery Switches, Switch Panels, Electrical
Manufacturer	Blue Sea Systems
Item model number	5191
Product Dimensions	6.35 x 6.35 x 5.08 cm; 45.36 g
ASIN	B0019ZBTV4

Have a Question? See What Others Asked

Does this item come with the fuse terminal included? If so, how do I specify the amperage

I have a new 100ah 12v lifepo battery. what fuse size do i need to go with this?

I'm thinking of running a charge/power wire of the alternator to a trailer battery. Would it be OK to use this off the charge lead on the alternator?

Can I use this as a bus bar (without a fuse), just to extend a 5/16 battery terminal. Thank you

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