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Dubai, United Arab Emirates

Blue Sea Systems 5191 Fuse Block Terminal 30-300 AMP

Blue Sea Systems 5191 Fuse Block Terminal 30-300 AMP

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: 3836489

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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

⚡300A max current

🔋58V DC max voltage

🛠️5/16" stud size

Frequently Bought Together

Description

⚡ Fuse your circuits with confidence—power, protection, and peace of mind!

SAFETY FIRST - Insulating cap prevents accidental shorts, keeping your system secure
UNIVERSAL FIT - Mounts easily on 3/8" battery posts with a single 5/16" stud connection
IGNITION READY - Compatible with MRBF fuses for ignition protection
WEATHERPROOF WARRIOR - Built to withstand harsh marine and open-cockpit environments
POWERHOUSE PROTECTION - Handles up to 300 amps for your high-demand circuits

The Blue Sea Systems 5191 Fuse Block Terminal supports 30-300A MRBF fuses, operating up to 58V DC. Designed for universal fit on 3/8" battery posts with a 5/16" stud, it offers weatherproof durability and ignition protection, making it ideal for marine and harsh environment applications.

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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