Sierra FS84210 Marine Rated Battery Fuse, 200A, Blue
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Sierra FS84210 marine rated battery fuse delivers compact, high-current DC main circuit protection directly at the battery’s positive stud. The blue, 200A fuse helps support safe overcurrent protection for demanding marine electrical circuits.
Key Features
- Ignition protected when used with Sierra MRBF fuses
- Bolt-down design for high-vibration installations
- Standard isolated M8 stud design for stacking terminals
- Insulating cap helps prevent accidental shorts
- Compact, high-current protection for tight mounting areas
- Designed for DC main, bow thruster, inverter, and windlass circuit protection
- 300A maximum amperage rating
- Meets ABYC requirements for DC main circuit protection on large battery banks with high-interrupt rating
- Easy fault indication with clear fuse display
- Color-coded amperage identifier
Intended Use
- Marine DC main circuit protection on battery banks
- Bow thruster circuit protection
- Inverter circuit protection
- Windlass circuit protection
Product Details
- Sierra FS84210 Marine Rated Battery Fuse, 200A, Blue
- Fuse/holder stud mount type: fits onto the positive battery stud for circuit protection at the power source
- Color: Blue
- Maximum amperage: 300A
- Stud design: Standard Isolated M8 stud design (supports stacking terminals)
- Circuit protection: ignition protected when used with Sierra MRBF fuses
- Fault indication: clear fuse display
- Identification: color-coded amperage identifier
- Service notes: confirm the fuse/holder configuration matches the compatible Sierra MRBF fuse used in your application and verify placement on the positive battery conductor using the system wiring diagram.
Parts Desk Insights
Best Use Case: Ideal for upgrading or restoring compact, high-current overcurrent protection at the battery’s positive stud—especially in installations where space is limited near the battery connection.
Common Issues: If nuisance blowing occurs or protection doesn’t behave as expected, re-check the fuse/holder pairing (MRBF fuse compatibility), confirm correct stud mounting and terminal stacking, and inspect the insulating cap and mating surfaces to reduce the chance of shorts at high current connections.
Related Products & Accessories
- Browse Sierra fuses & fuse holders - Use the fuses collection to find MRBF-compatible replacements and related protection components.
- Electrical & Accessories - Explore supporting electrical components used with marine battery protection systems.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.