SKU: 99931870156

MRBF 300A Terminal Fuse (Spare)

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Description

MRBF 300A Terminal Fuse (Spare)Spare part Blue Sea 5190 MRBF Terminal Fuse, 300A Buying a fresh install? The MRBF Fuse Kit is better value (block + 300A fuse for 36. 99 inc VAT). About this part Blue Sea Systems Marine Rated Battery Fuse, 300A. Designed for use with the matching MRBF Terminal Fuse Block never mount this fuse directly to a battery terminal. Ignition protected (safe for installation aboard gasoline powered boats) Clear window for visual blown state indication Color

Spare part - Blue Sea 5190 MRBF Terminal Fuse, 300A

Buying a fresh install? The MRBF Fuse Kit is better value (block + 300A fuse for £36.99 inc VAT).

About this part

Blue Sea Systems Marine-Rated Battery Fuse, 300A. Designed for use with the matching MRBF Terminal Fuse Block - never mount this fuse directly to a battery terminal.

  • Ignition-protected (safe for installation aboard gasoline-powered boats)
  • Clear window for visual blown-state indication
  • Color-coded for amperage
  • Satisfies ABYC requirements for DC main circuit protection

Important: read before installing

Heads up. This is a short-circuit compliance fuse - not a cable-protection fuse.

The 300A rating exists to satisfy BS 7671's worst-case short-circuit requirement without nuisance-tripping on legitimate inrush currents (inverter startup, induction hob ignition, large DC-DC chargers). It is not sized to protect any one cable or load downstream.

You remain responsible for ensuring the wiring between this fuse and your loads is appropriate - either cabling rated for at least 300A continuous, or a correctly-sized secondary fuse close to each load. If you need a tighter primary rating, MRBF fuses are available from 30A-300A in the same physical format from Blue Sea Systems and most marine suppliers. We do not stock the smaller ratings.

For full sizing guidance see the MRBF Fuse Kit listing. If you're unsure, please ask before fitting.

Specifications

Amperage 300A
Maximum voltage 58V DC
AIC (Interrupt capacity) 10,000A @ 14V DC · 5,000A @ 32V DC · 2,000A @ 58V DC
Ignition-protected Yes
Weight 0.03 kg
Manufacturer Blue Sea Systems (PN 5190)

Technical reference

Drawings & curves sourced from Blue Sea Systems product documentation.

Dimensioned drawing - Blue Sea 5175-5190
Trip-delay curve - MRBF terminal fuses
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 99931870156

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4.1 ★★★★★
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Kristi V.
Lexington, US
★★★★★ 4
Almost perfect...upraised logo should be left off
This toy is great for relentless chewers with strong jaws! It would be almost perfect if it didn't have a "K9" logo in raised rubber on it. That is the place that my aggressive chewer shepherd/bulldog mix focuses on and is able to get small chunks off. Without that logo, he would chew the ball more evenly, instead of fixating on that one spot. He loves this ball and has chewed on it for about an hour off & on each of the 11 days he has had it. Although it is very durable so far, the flaw is the upraised logo.
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Reviewed in the United States on January 22, 2026
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Ryan
San Leandro, US
★★★★★ 5
Perfect for High-Drive Dogs & Surprisingly Durable (six month review)
I use this ring ball for structured fetch and tug sessions with my high-drive German Shepherd mix (91 lbs. at 10 mon.), and it’s easily the best toy we’ve added to our routine. What makes it truly exceptional is how it allows my dog to engage in the full canine predatory sequence: • Chase: He locks in visually and bolts after the ring when I throw it. • Grab & Hold: He brings it back, pins it against my leg, and bites down firmly (the toy—not the leg!)—his way of acting out the natural catch-and-control behavior. • Unalive & Tug: We finish with a strong tug session, which satisfies his instinct to grip and shake—basically his version of “making the toy unalive.” • Settle & Chew: Afterward, he relaxes with a chew toy or eats—completing the full physical and mental cycle in a healthy, balanced way. Durability is outstanding—this toy stands up to intense tug sessions with no tearing or damage, even with a 91 lb powerhouse. My senior dog also joins in for double tug play, and it holds up beautifully to that too. I don’t leave this toy down for chewing—it’s not a chew toy. I use it specifically for fetch and tug, then put it away when we’re done. This keeps it exciting and extends its lifespan. My dog has other chew toys he can use freely throughout the day. This isn’t just another fetch toy—when thoughtful it provides a structured, instinct-satisfying experience that’s mentally enriching and physically engaging. If you have a high-drive or working breed, or a dog who thrives on interactive play, this ring ball is 100% worth it.
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Reviewed in the United States on March 30, 2025
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ollie1
Draper, US
★★★★★ 5
Love these!!!
Color: Black and White, Color: Black and White
I absolutely love these socks!!! I use them so I can walk around the house when I put lotion on my feet. They are perfect. Very very smart young lady that came up with this idea.
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Reviewed in the United States on February 14, 2026
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Odette M
Grantham, US
★★★★★ 5
The best freetoes socks ever
Color: Black, Grey
Love this toeless socks so much! I could wear it all day. Very comfortable! It is just the right thickness which is suitable in summer time or cold weather as well. Most of the toeless socks I have seen have the gel on the heel area and I don't like the feel of it. I'd rather apply lotion on my heel then wear the socks. I have had some issues with the packaging from Amazon and I made the maker of this said socks aware of it. Julia Bebben was very prompt in her response and very helpful. Thank you Julia for your excellent customer service.
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Reviewed in the United States on November 4, 2023
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Kindle Customer
Charlottesville, US
★★★★★ 4
great concept, just one tiny annoyance...
Color: Black, Grey
i love that a sock that lets your toes be free is even a thing that exists. i love that this company was started by a young girl, now turned young businesswoman. i have pain in my big toes, so i can't wear close toed anything, but feet get stinky if you wear shoes/slippers all the time without socks. this is a great solution. the only thing i find slightly annoying (not enough to stop using these) is the seam on the bottom of your foot, near the base of the toes. it is a straight line, which is fine on the top of the foot, but i wish the bottom itself curved a bit, to follow the line of the toes. as it is, the seam lands right in the middle if the ball of my feet, so i can feel the seams everytime i take a step. i am constantly pulling the seam toward the toes, to try to keep from feeling it, but then my pinky toe gets caught and balled up on the inside. outside of that slight annoyance, they're comfortable and fit well.
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