Blue Sea Systems 50A MAXI Blade Fuse – BSS-5140
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50A MAXI Blade Fuse for Marine High-Current DC Circuits
Heavy-duty overcurrent protection for high-current marine DC circuits in the MAXI blade fuse format. This 50-amp MAXI fuse is designed for use with MAXI inline fuse holders and provides fast-blow protection that trips quickly under overload to safeguard wiring and connected components before damage can occur.
The MAXI blade fuse format is a larger, higher-current version of the standard ATO/ATC blade fuse, commonly used in marine electrical systems for protecting high-draw accessories and battery feed circuits where standard blade fuses are undersized.
Specifications
- Amperage Rating: 50A
- Type: MAXI blade fuse (fast-blow)
- Application: Marine high-current DC circuit protection
- Part Number: BSS-5140
- SKU: BSS-5140
Best Use Cases
- Protecting 50A high-draw DC circuits on powerboats and sailboats
- Battery feed protection for electric windlasses, thrusters, and large inverters
- Replacement fuse for existing MAXI inline fuse holder installations
- High-current branch circuit protection where standard blade fuses are undersized
Parts Desk Insights
The 50A MAXI is a go-to for protecting high-draw accessories that exceed the capacity of standard ATO/ATC blade fuses. It's commonly used on electric anchor windlasses, bow thrusters, and large DC motor circuits. For a complete inline fuse installation, pair with the MAXI Inline Fuse Holder 30–80A – BSS-5068, which is rated to handle this fuse's full amperage range. For main battery cable protection at higher amperage, consider the 300A ANL Fuse Block with Cover – BSS-5005 on your primary feed. Always size your fuse to the wire gauge — not just the load — to protect the cable from overcurrent damage.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.