DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan

Customer Services

About Us

Customer Support

Desert Online General Trading LLC

Dubai, United Arab Emirates

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.

Product ID: 269370263

Secure Transaction

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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

₩85252

Duties & taxes incl.

South Koreastore

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews