Blue Sea Systems 250A Class T Fuse – BSS-5118
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250A Class T Fuse for Marine High-Current DC Systems
Heavy-duty overcurrent protection for large marine DC systems. This 250-amp Class T fuse is designed for main battery cable protection on powerboats, sailboats, and vessels with high-capacity electrical systems. Class T fuses are recognized for their extremely fast-blow characteristics and high interrupt capacity — making them the preferred choice for protecting large battery banks and main feed cables where fault currents can be dangerously high.
At 250A, this fuse covers a wide range of serious marine electrical builds without stepping up to the maximum 400A rating.
Specifications
- Amperage Rating: 250A
- Type: Class T fuse (fast-blow, high interrupt capacity)
- Application: Marine main battery feed and high-current DC protection
- Part Number: BSS-5118
- SKU: BSS-5118
Best Use Cases
- Main battery cable protection on mid-to-large powerboats and sailboats
- Primary overcurrent protection for battery banks feeding inverters, thrusters, and windlasses
- Protecting main feed cables on vessels with multiple high-draw DC loads
- Replacement fuse for existing Class T fuse block installations rated at 250A
Parts Desk Insights
The 250A Class T is the most versatile rating in this family — it covers the majority of serious marine electrical builds without the overkill of the 400A. Class T fuses carry a significantly higher interrupt capacity than ANL fuses, making them the right choice when your battery bank can deliver extremely high fault currents. If your system demands more headroom, step up to the 400A Class T (BSS-5121). For lighter loads, the 150A Class T (BSS-5114) may be the better fit. For mid-range main feed protection where Class T interrupt ratings aren’t required, the 300A ANL Fuse Block with Cover – BSS-5005 is a cost-effective alternative. Always size your fuse to the wire gauge — not just the load.
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.