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.

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.

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.

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

No you can't.. The stud is insulated from the block.. And don't grind it down. As they are meant for fuses to complete the circuit. Just buy a battery post if you need that...

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MRBF Terminal Fuse Blocks

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 circuit protection

🔩Isolated stud design with standard M8 hardware

🌧️Weatherproof for harsh marine environments

Description

⚡ Power up your marine circuits with confidence—stack, protect, and conquer the waves!

MARINE GRADE DURABILITY - Weatherproof construction ensures reliable performance even in open-cockpit boats and challenging environments.
SAFETY FIRST INSULATION - Protect your circuits with an insulating cap that prevents accidental shorts and enhances operational safety.
UNIVERSAL COMPATIBILITY - Supports 5/16" or 3/8" ring terminals, making integration effortless across diverse electrical systems.
COMPACT HIGH CURRENT DEFENSE - Engineered to deliver robust fuse protection in tight spaces—perfect for DC mains, inverters, and marine thrusters.
STACKABLE TERMINAL INNOVATION - New isolated stud design allows seamless stacking with standard 5/16" hardware for scalable setups.

The Blue Sea Systems MRBF Terminal Fuse Block features a cutting-edge isolated stud design compatible with standard M8 hardware, enabling terminal stacking for scalable electrical setups. Compact yet powerful, it provides high-amp fuse protection ideal for DC mains, inverters, windlasses, and bow thrusters. Built weatherproof for harsh marine environments, it includes an insulating cap to prevent shorts, ensuring safe and reliable circuit protection in tight spaces.

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

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