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Bay Marine Supply MRBF Terminal Fuse Block Kit (Fuse Included) – Single Stud 5/16" (M8) Compact Marine Rated Battery Fuse 030A

4.6 4.6 out of 5 stars 383 ratings
$37.14
FREE Returns
030A
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Purchase options and add-ons

Connector Type Screw
Brand Bay Marine Supply
Voltage 58 Volts
Number Of Poles 1

About this item

  • TERMINAL FUSE BLOCK KITS (Fuse Included) – Links to MRBF Fuses & Fuse Block listings for purchase separately can be found below in the description
  • Fuse Mount Kit Includes: (1) Single MRBF Terminal Fuse Block, (1) MRBF Fuse of your choice between 30-300 Amp, (1) Red Insulator Cap, (1) Washer, (1) Lock Washer, (1) M8 Hex Nut
  • Fuses have a Max Voltage Rating: 58V –– Fuse Holder have an Amperage Rating: 30-300A –– Fuses Holder Stud Size: M8 (5/16") –– Fuse Holder Mounting Hole: M10 (3/8")
  • Compact, high-amp fuse appropriate for DC Main, inverters, windlass, and bow thruster circuit protection. Provides high current protection in tight space constraints. Ignition protected when used with MRBF Terminal Fuse Blocks. Isolated stud design uses standard M8 hardware and permits stacking of terminals.
  • IGNITION PROTECTED – Safe for installation aboard gasoline powered boats. IP66 – Protected against powerful water jets. 10,000 AIC at 14V DC satisfies ABYC requirements for DC Main circuit protection on large battery banks. [WARNING: Do not mount fuses directly on battery terminals. Must use with Terminal Fuse Blocks.]

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.5 x 1 x 2 inches; 3.21 ounces
  • Item model number ‏ : ‎ MRBF-M8-S030
  • Date First Available ‏ : ‎ December 13, 2018
  • Manufacturer ‏ : ‎ Bay Marine Supply
  • ASIN ‏ : ‎ B07LC5S8C9
  • Customer Reviews:
    4.6 4.6 out of 5 stars 383 ratings

Product Description

Bay Marine Supply Brand MRBF Fuse and Fuse Block Terminal – Marine Rated Battery Fuse 30-300 Amp Rating

Manufactured in North America by Eaton – Cooper Bussmann

Marine Rated Battery Fuse MRBF 5191 2151 Single Terminal Fuse Block Mount 300 Amp 300A 300amps

Marine Rated Battery Fuse MRBF 5191 2151 Single Terminal Fuse Block Mount 300 Amp 300A 300amps

Marine Rated Battery Fuse MRBF 5191 2151 Single Terminal Fuse Block Mount 300 Amp 300A 300amps

Marine Rated Battery Fuse MRBF 5191 2151 Single Terminal Fuse Block Mount 300 Amp 300A 300amps

MRBF Fuse Holder can be mounted directly onto battery terminals.

Compact in size, perfect for tight space installations.

Interchangeable and replaceable fuses, sizes ranging from 30A to 300A.

MRBF Fuse Holder can be mounted on busbars.

Bay Marine Supply Single MRBF Fuse Mount Holder Block 5/16" M8 5191 Compact Automotive Battery Fuse Bay Marine Supply Dual MRBF Fuse Mount Holder Block 5/16" M8 2151 Compact Automotive Battery Fuse Bay Marine Supply MRBF Fuse Mount Holder Block 5/16" M8 5190 Compact Automotive Battery Fuse Bay Marine Supply Single MRBF Fuse Mount Holder Block 5/16" M8 5191 Compact Automotive Battery Fuse
Single MRBF Fuse Block – Fuse NOT Included Dual MRBF Fuse Block – Fuse NOT Included MRBF Fuse Single MRBF Fuse Block Kit – Includes Fuse
See Details
See Details
Customer Reviews
4.6 out of 5 stars
70
4.6 out of 5 stars
58
4.7 out of 5 stars
262
4.6 out of 5 stars
383
Price $19.90 $26.60 $15.99 —
Includes: Single MRBF Fuse Block ✓ ✓
Includes: Dual MRBF Fuse Block ✓
Includes: Choice of Fuse (30-300 Amps) 30A, 40A, 50A, 60A, 75A, 80A, 90A, 100A, 125A, 150A, 175A, 200A, 225A, 250A, 300A 30A, 40A, 50A, 60A, 75A, 80A, 90A, 100A, 125A, 150A, 175A, 200A, 225A, 250A, 300A
Includes: Insulating Cap, Washer(s), Lock Washer(s), Hex Nut(s) ✓ ✓ ✓
Fuse Block Stud Size 5/16" (M8) 5/16" (M8) 5/16" (M8)
Fuse Block Mounting Hole Size 3/8" (M10) 3/8" (M10) 3/8" (M10)
Maximum Amperage 300 Amps 300 Amps 30-300 Amps 300 Amps
Maximum Voltage 58V DC 58V DC 58V DC 58V DC
Interrupt Capacity 10,000A @ 14V DC – 5,000A @ 32V DC – 2,000A @ 58V DC 10,000A @ 14V DC – 5,000A @ 32V DC – 2,000A @ 58V DC
Regulatory Specifications Ignition Protected: When used with MRBF Terminal Fuse Ignition Protected: When used with MRBF Terminal Fuse IP66 – SAE J1171 Marine – Ignition Protected IP66 – SAE J1171 Marine – Ignition Protected
Bay Marine Supply 5191 and 2151 MRBF Fuse Block

Bay Marine Supply Marine Rated Battery Fuse MRBF
Marine Rated battery Fuses

Designed for the most demanding environment to provide high current protection for the tightest space constraints. Suitable for main and auxiliary circuit protection such as alternator outputs, starter motor inputs and accessory circuits. Alleviates having to make up a short wire to connect to a standard fuse block to the battery. Safe for installation aboard gasoline powered boats.

  • DO NOT mount fuse directly onto battery post. Fuses should be mounted on the MRBF terminal fuse block. (See examples below)
  • Ingress Protection: IP66, protected against powerful water jets
  • Ignition Protected: Per SAEJ1117

Application

Full range circuit protection for automotive and marine applications. The breaking capacity meets the requirements of conventional vehicle batteries and 12V, 24V and 42V electrical networks. Compact, high-amp fuse appropriate for DC Main, inverters, windlass, and bow thruster circuit protection. Provides high current protection in tight space constraints. Ignition protected when used with MRBF Terminal Fuse Blocks. Isolated stud design uses standard M8 hardware and permits stacking of terminals.

  • Stud Size: 5/16" (M8), accepts 5/16" ring terminals
  • Terminal Mounting Hole: 3/8" (M10)
  • Maximum Voltage Rating: 58Vdc
  • Amperage Rating: 30A – 300A
  • Interrupt Rating: 10,000A @ 14Vdc / 5,000A @ 32Vdc / 2,000A @ 58Vdc
  • Maximum Torque Rating: 12 N•m (106 in-lbs)
  • Material: Body - Ceramic; Housing & Cover: UL-rated 94V0 Thermoplastic; Ring Terminals - Tin Plated

Bay Marine Supply MRBF 5191 Marine Rated Battery Fuse Single Terminal Fuse Mount Holder Block

Diagram Single Stud Terminal MRBF Fuse Mount 5191 5/16" Ring Terminal

Bay Marine Supply 5191 MRBF Fuse Terminal 5/16" Single Stud

5191 MRBF Single Terminal Fuse Mount Fuse Holder Fuse Block Marine Rated Battery Fuse

Bay Marine Supply 5191 – Single Stud Terminal Fuse Block

Diagram of Single Terminal Block

Dimensions of Single Terminal Block

With Fuse Mounted

Bay Marine Supply MRBF 2151 Marine Rated Battery Fuse Dual Terminal Fuse Mount Holder Block

Diagram Dual Stud Terminal MRBF Fuse Mount 2151 5/16" Ring Terminal

Bay Marine Supply 2151 MRBF Fuse Terminal 5/16" Dual Stud

2151 MRBF Dual Terminal Fuse Mount Fuse Holder Fuse Block Marine Rated Battery Fuse

Bay Marine Supply 2151 – Dual Stud Terminal Fuse Block

Diagram of Dual Terminal Block

Dimensions of Dual Terminal Block

With Fuses Mounted

Looking for specific info?

Customer reviews

4.6 out of 5 stars
4.6 out of 5
383 global ratings

Customers say

Customers like the performance, ease of installation, quality and compactness of the terminal block. They mention that it works great, takes up minimal space and provides more cable strength. Some are disappointed with the fuse, and heating. Opinions are mixed on value.

AI-generated from the text of customer reviews

8 customers mention8 positive0 negative

Customers are satisfied with the performance of the terminal block. They mention that it works great on their hydro battery bank and to hook up their Blue Seas ACR system.

"Was a little expensive but everything is for my boat lol. Seems to work well with my add-a-battery system and nothing failed on the maiden voyage..." Read more

"Worked great to hook up Blue seas ACR system." Read more

"Works great on our hydro battery bank!" Read more

"Works great, high quality" Read more

7 customers mention7 positive0 negative

Customers find the installation of the terminal block to be super easy. They also appreciate the safety cap that ensures they don't accidentally short out the circuit.

"...The block and fuse are very compact and easy to install...." Read more

"...Super easy install and love the safety cap to ensure I don't accidentally touch it causing some major damage." Read more

"...to splice the fuse holder in, this great alternative is far easier to install on the battery itself and allows you to maintain the integrity of your..." Read more

"...This mount made it possible. Easy setup and it looks clean. Definitely a recommended item.A+++" Read more

7 customers mention7 positive0 negative

Customers are satisfied with the quality of the terminal block. For example, they mention it's well constructed, provides more cable strength, and current pass through.

"...I am using them directly on batteries and my terminal block. Great quality product, highly recommended." Read more

"...Seems to work well with my add-a-battery system and nothing failed on the maiden voyage with everything hooked up." Read more

"Well constructed and good price when block purchased with fuse in kit. I see no difference from much higher priced version from bluesea...." Read more

"...allows you to maintain the integrity of your cables uncut--providing more cable strength, current pass through and options for passing cables..." Read more

5 customers mention5 positive0 negative

Customers like the compactness of the terminal block. They say it takes up minimal space and protects all the wiring from the battery terminal. Some say it's a great solution for tight spaces.

"...The block and fuse are very compact and easy to install...." Read more

"Seems a bit expensive for what it is but it's a good compact solution." Read more

"The size and compactness are great but my 300A fuse is overheating the battery terminal past its limit of 140°F / 60 at only 120A actually used...." Read more

"...Great solution for tight spaces, mounted mine directly to hot feed of a solenoid, very convenient and took virtually no extra room...." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the protection provided by the terminal block. They mention that it takes up minimal space, protects all the wiring from the battery terminal, and is excellent for marine protection. The product has an IP66 rating, so it can handle adverse environmental conditions. Customers also appreciate the safety cap that ensures they don't accidentally short out the circuit.

"...they have an ingress rating of IP66, so they can handle adverse environmental conditions...." Read more

"...Super easy install and love the safety cap to ensure I don't accidentally touch it causing some major damage." Read more

"Terminal fuses are great for protecting marine circuits. Takes up minimal space and protects all the wiring from the battery terminal onward...." Read more

9 customers mention5 positive4 negative

Customers are mixed about the value of the terminal block. Some mention it's well constructed and has a good price, while others say it'll be a little pricey.

"...It's worth the extra money!" Read more

"...The only downside of these MRBF fuses is that the replacement fuses are very expensive compared to MEGA/AMG fuses and especially the AMI/MIDI fuses." Read more

"Well constructed and good price when block purchased with fuse in kit. I see no difference from much higher priced version from bluesea...." Read more

"Seems a bit expensive for what it is but it's a good compact solution." Read more

3 customers mention0 positive3 negative

Customers are dissatisfied with the fuse. They mention that it's just a fuse, expensive, and not capable with a 300A fuse.

"...I'm sure it works fine with a 100A fuse, but obviously not capable with a 300A fuse." Read more

"The fuse is just a fuse. It’s expensive. It works. This sellers customer service is good though. I would buy from them again. Thank you" Read more

"Only received fuses, no holders" Read more

3 customers mention0 positive3 negative

Customers are dissatisfied with the heating of the terminal block. They mention that the fuse gets too hot and unsafe overheating. Some customers also say that the product melted running approx. 200 amps.

"The size and compactness are great but my 300A fuse is overheating the battery terminal past its limit of 140°F / 60 at only 120A actually used...." Read more

"...12 months ago and it only had 1 job... Unfortunately it melted running approx. 200amps... I only gave it 2 stars because I'm sure it works fine with..." Read more

"Purchased 300A and it gets unsafe Hot at 200 amps. I checked all connections and changed the wire size from 2/0 to 4/0 and still Hot...." Read more

Go name brand when on safety equipment!
5 Stars
Go name brand when on safety equipment!
This name brand costs a little more but it's also the last line of defense before something catastrophic happens. It's worth the extra money!
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Top reviews from the United States

Gautam
5.0 out of 5 stars Works great / reasonable price
Reviewed in the United States on October 10, 2020
Size: 225AVerified Purchase
Using it for van build electrical setup, the item shipped fast. I am using them directly on batteries and my terminal block. Great quality product, highly recommended.
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Galka
5.0 out of 5 stars Compact and simple
Reviewed in the United States on January 6, 2020
Size: 250AVerified Purchase
I am using this on an 8-battery solar bank with each 2-battery series fused on the load side. This provides short circuit/overload protection at each module as close to the battery as possible. Having the fuse block on the battery also makes for a nice heat sink. The block and fuse are very compact and easy to install. Remember to account for a fused connection in your overall wire load/temp/size calculations - there are plenty of online calculators out there to make this calculation for you.
5 people found this helpful
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Tall Dan
5.0 out of 5 stars Great When Space is Limited
Reviewed in the United States on May 30, 2020
Size: 100AVerified Purchase
The system I am building will be installed in a location where there just is not much space to spread out the components. I have used these fuse blocks in two locations: bolted directly to the positive lithium battery terminal (for a main system fuse) and on the output terminal of the main system switch (for a high amperage branch circuit). I do not recommend attaching directly to a battery terminal if you are not using lithium batteries. Other than space considerations the other reason I use these is because they have an ingress rating of IP66, so they can handle adverse environmental conditions. The only downside of these MRBF fuses is that the replacement fuses are very expensive compared to MEGA/AMG fuses and especially the AMI/MIDI fuses.
2 people found this helpful
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JL in SD
4.0 out of 5 stars A little pricey
Reviewed in the United States on May 21, 2021
Size: 150AVerified Purchase
Seems a bit expensive for what it is but it's a good compact solution.
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Joe, America Born and Raised. USA.
5.0 out of 5 stars Fuses are like a condom you be glade you used them sooner or later.
Reviewed in the United States on April 19, 2021
Size: 080AVerified Purchase
If you have batteries of any kind you need to put these on them to help protect your investment. If something were to short out this could prevents wire damage and fire if you get the right size fuses to go with it. I have 6 deep cycle i have these on that power up my solar system. If anything does happen they will save my system and house. I only put 75 amp on each one. 75 x 6 = 450 amps thats a lot of go go juice that can do some serious damage. So don't think you need more then you should. Under size you fuses if you blow one, find out why then upsize. Or just design you system to match you needs. I see campers using 30 amp fuses in a 5 amp radio. Really?
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Kenneth Downs
5.0 out of 5 stars Go name brand when on safety equipment!
Reviewed in the United States on February 17, 2023
Size: 250AVerified Purchase
This name brand costs a little more but it's also the last line of defense before something catastrophic happens. It's worth the extra money!
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Kenneth Downs
5.0 out of 5 stars Go name brand when on safety equipment!
Reviewed in the United States on February 17, 2023
This name brand costs a little more but it's also the last line of defense before something catastrophic happens. It's worth the extra money!
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One person found this helpful
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Elliott Hk Asbury
5.0 out of 5 stars Love this solution!
Reviewed in the United States on March 3, 2023
Size: 125AVerified Purchase
This saved me from having to cut and crimp another section of 4/0 gauge to add a fuse between the battery post and my bus bar. Huge win.
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Florida Hunter
5.0 out of 5 stars Little pricey
Reviewed in the United States on June 4, 2019
Size: 100AVerified Purchase
Was a little expensive but everything is for my boat lol. Seems to work well with my add-a-battery system and nothing failed on the maiden voyage with everything hooked up.
One person found this helpful
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Top reviews from other countries

aoran
5.0 out of 5 stars Still doing its thing
Reviewed in Canada on October 23, 2023
Size: 250AVerified Purchase
Upgraded to a high output alternator and this sits on my + battery terminal, connected to the alternator. A nice compact profile. Make sure you have a good connection to your battery clamps otherwise this thing can overheat and the plastic starts to melt.
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