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Blue Sea SystemsMRBF Terminal Fuse Blocks

Blue Sea SystemsMRBF 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.

4.6/5

Product ID: 269370263

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Details

Current Rating
300 Amps
Gauge
1.0
Connector Type
Screw
Number Of Contacts
1
Mounting Type
hole mount
Material
Plastic

⚡High-amp fuse capacity

🔩M8 stud stacking

🌧️Weatherproof design

Frequently Bought Together

Description

⚡ Power up your marine setup with compact, stackable, weatherproof protection!

WEATHERPROOF DURABILITY - Built to withstand harsh marine environments—perfect for open-cockpit boats.
STACKABLE M 8 STUD DESIGN - Maximize your wiring setup with easy terminal stacking using standard M8 hardware.
ACCIDENTAL SHORT PREVENTION - Insulating cap ensures safety by preventing unexpected electrical shorts.
COMPACT HIGH AMP FUSE BLOCK - Protect critical DC circuits like inverters and bow thrusters without sacrificing space.
VERSATILE CIRCUIT PROTECTION - Ideal for main DC, windlass, and other high-current marine applications.

Blue Sea Systems MRBF Terminal Fuse Blocks deliver high-current DC circuit protection in a compact, weatherproof design. Featuring a new isolated M8 stud for easy terminal stacking, these fuse blocks are perfect for marine applications like inverters, windlasses, and bow thrusters, ensuring safe and reliable power management even in harsh environments.

Specifications

Color	blue
Size	2.40'' x .79''
Style	1 Fuse
connector-type	Screw
Height	5.06 inches
Length	3 inches
Weight	0.5 Pounds
Width	1.75 inches
Batteries Included?	No
Brand	Blue Sea Systems
Department	Battery Switches, Switch Panels, Electrical
Manufacturer	Acr Electronics
Item model number	5191
Product Dimensions	16 x 6.35 x 5.08 cm; 81.65 Grams
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

Common Questions

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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