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Sold by: Bay Marine Supply
Sold by: Bay Marine Supply
(981 ratings)
95% positive over last 12 months
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MRBF Terminal Fuse Block Kit (Fuse Included) – Single Stud 5/16" (M8) Compact Marine Rated Battery Fuse 250A

4.6 4.6 out of 5 stars 384 ratings

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250A

Purchase options and add-ons

Connector Type Screw
Mounting Type DIN Rail Mount
Color Red
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-S250
  • Date First Available ‏ : ‎ December 14, 2018
  • Manufacturer ‏ : ‎ Bay Marine Supply
  • ASIN ‏ : ‎ B07LC3Q4LD
  • Customer Reviews:
    4.6 4.6 out of 5 stars 384 ratings

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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
Customer Reviews
4.6 out of 5 stars
69
4.5 out of 5 stars
56
4.7 out of 5 stars
256
4.6 out of 5 stars
384
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
384 global ratings

Customers say

Customers like the performance, compactness, quality and ease of installation of the terminal block. They mention that it works well, is a great solution for tight spaces and that it's well constructed. That said, 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 say it works well with their add-a-battery system and nothing failed on the maiden voyage.

"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 process of the terminal block to be easy. They mention that it is compact, simple, and convenient.

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

"...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

7 customers mention7 positive0 negative

Customers are satisfied with the quality of the terminal block. They mention that it is well constructed and highly recommended.

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

"...Wish I had discovered these sooner. Quality seems good. Price was best I could find" Read more

"great product, very happy with this purchase" Read more

5 customers mention5 positive0 negative

Customers appreciate the compactness of the terminal block. They say it is simple and a great solution for tight spaces.

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

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

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

9 customers mention5 positive4 negative

Customers are mixed about the value of the terminal block. Some mention that it's well constructed and has a good price, while others say that the fuse is just a fuse and is expensive.

"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

"...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

3 customers mention0 positive3 negative

Customers are not satisfied with the comfort of the terminal block. They mention that the fuse gets too hot and it melted running approx. 200amps.

"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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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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