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Blue Sea 200A Marine Rated Battery (MRBF) Terminal Fuse
Blue Sea 200A Marine Rated Battery (MRBF) Terminal Fuse
Compact, ignition-protected 50A MRBF battery terminal fusing with clear visual status for demanding 12V/24V/48V DC systems
Regular price
$28.00
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In Stock
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DESCRIPTION
Marine-rated MRBF terminal fuse protection for high-current DC circuits
The Blue Sea Marine Rated Battery (MRBF) Terminal Fuse is built for protecting high-current DC cabling as close to the battery as practical—where a fault can otherwise turn into heat, voltage collapse, damaged equipment, or a fire risk. By placing a correctly sized fuse at the battery connection, you reduce the length of unprotected cable and help safeguard critical loads such as inverters, DC distribution, windlasses, thrusters, and high-output charging circuits.
Designed for demanding marine and vehicle environments, this fuse suits common 12V, 24V and 48V installations (up to 58V DC). It’s also ignition protected, making it a considered choice for engine bays and enclosed spaces where fuel vapours may be present. The result is compact, purpose-built overcurrent protection that supports cleaner installs and more confidence when your electrical system is under load.
Why MRBF fusing is preferred over generic inline holders
High-current circuits need more than “a fuse in the line”. MRBF fusing is engineered to manage fault energy with a strong interrupt rating suited to battery banks and low-impedance cabling. Compared with light-duty fuse solutions, the MRBF format helps reduce installation bulk, improves serviceability, and can simplify battery terminal layouts—especially where room is limited and multiple conductors must be managed neatly.
Practical, service-friendly design
A clear, inspection-friendly housing provides quick visual indication of fuse status—useful when troubleshooting an inverter shutdown, a no-start condition, or an accessory circuit that has gone offline. Amperage identification is straightforward, and the compact footprint helps in tight battery compartments often found in caravans, 4WD builds and boats.
For best results, pair this fuse with the appropriate MRBF terminal fuse block and install it to protect the cable feeding your 50A DC circuit. Correct fuse selection depends on cable size, expected continuous current, and allowable surge current—especially for loads with inrush such as inverter start-up or motor-driven equipment.
Key features
- High-current battery protection to help reduce the impact of short-circuits and overloads
- Marine-rated construction suited to vibration, moisture and harsh onboard conditions
- Ignition protected for safer installation in engine spaces and enclosed compartments
- Clear housing for fast visual checks during maintenance and fault-finding
- Compact, battery-adjacent format that supports tidy installs in limited space
- Suitable for 12V/24V/48V systems (up to 58V DC) across marine, 4WD and caravan electrics
Common applications in Australia
This MRBF terminal fuse is commonly specified for marine battery fuse and battery terminal fuse installations where reliability matters—touring vehicles, overland 4WDs, camper trailers, caravans, and recreational or commercial vessels. It’s a practical choice when protecting a main feed, alternator-to-battery cabling, or a dedicated supply to a high-draw load.
Ready to protect your battery cabling?
Add this Blue Sea MRBF terminal fuse to your build to help protect your 50A battery-fed circuit and support a safer, more serviceable DC electrical system.
SPECIFICATIONS
Specifications
| Amperage | 50A |
|---|---|
| Ignition Protected | Yes |
| Maximum Voltage | 58V DC |
| Interrupt Capacity |
10000A @ 14V DC 5000A @ 32V DC 2000A @ 58V DC |
| Weight (min / max) |
0.06–0.06 lb (0.03–0.03 kg) (approx. 27 g; reference only) |
| SKU: | BS-5187B |
| Barcode: | 632085051877 |
| Model #: | BS-5187B |
| MPN: | BS-5187B |
WARRANTY
Blue Sea Warranty Policy
Blue Sea Systems products sold by us are supplied with a warranty against defects for the warranty period shown below, subject to the product type, application and the terms of this warranty policy.
The express warranty provided by us is limited to a maximum of 5 years from the original date of purchase, unless otherwise required under Australian Consumer Law.
Blue Sea Systems may offer longer manufacturer support on some products at their discretion
Warranty Lengths by Product Range
| Blue Sea Product Range | Warranty Length | Application / Notes |
|---|---|---|
| Most Blue Sea Systems Products | 5 years | Applies to most Blue Sea Systems products found to be defective in materials or manufacture. |
| P12 Battery Chargers | 5 years | Warranty period starts from the original date of purchase. |
| P12 Remote Displays | 5 years | Warranty period starts from the original date of purchase. |
| Digital Meters | 3 years | Warranty period starts from the original date of purchase. |
| Vessel System Monitors | 3 years | Warranty period starts from the original date of purchase. |
Warranty Assessment and Remedy
If a Blue Sea Systems product is found to be defective in materials or manufacture within the applicable warranty period, we will, at our discretion, arrange a repair, replacement, store credit or refund, depending on the nature of the fault and the requirements of Australian Consumer Law.
Products may need to be returned for assessment before a warranty claim can be approved. Where required, the product must be returned with dated proof of purchase and a clear description of the fault.
Labour costs for removing, replacing, reinstalling or diagnosing a product are not covered by this express warranty unless otherwise required under Australian Consumer Law.
Making a Warranty Claim
To make a warranty claim, please contact us with your dated proof of purchase, product details and a description of the fault.
The product may need to be returned for inspection before the claim can be assessed. If the product is confirmed to be faulty and covered by this warranty, we will advise the available remedy.
What This Warranty Does Not Cover
This warranty does not cover faults or damage caused by incorrect installation, incorrect application, misuse, abuse, neglect, unauthorised modification, accidental damage, normal wear and tear, environmental damage, or failure to use the product in accordance with the manufacturer's instructions.
- Incorrect installation or wiring
- Incorrect product selection or application
- Misuse, abuse or neglect
- Physical or accidental damage
- Water ingress or environmental damage outside the product's intended use
- Unauthorised modification or repair
- Normal wear and tear
- Labour costs for removal, replacement, reinstallation or diagnosis
- Freight, travel or call-out costs unless otherwise required by law
- Products not returned for assessment when reasonably required
Manufacturer Support
Blue Sea Systems may provide additional manufacturer support on some products beyond the warranty period listed above. Where available, we may assist customers in contacting the manufacturer, but any manufacturer support beyond the express warranty period is subject to the manufacturer's own terms and continued availability.
Australian Consumer Law
This warranty is in addition to other rights and remedies available at law. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
