Fuse JJN (Class T) 350 Amp
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Protect high-amperage DC electronics with a Blue Sea Systems Class T fuse designed for extremely fast short-circuit response. The 350 Amp rating and high interrupt capability make it a strong choice for inverter and other power-distribution protection applications.
Key Features
- 350 Amp Class T fuse for high-amperage DC protection
- Extremely fast short-circuit response to help protect connected electronics
- 20,000 Ampere Interrupt Capacity (AIC) for DC applications (UL rated under UL189L)
Intended Use
- Inverter circuit protection (DC power systems)
- Battery and power-distribution protection where Class T fuses are used
- High-amperage DC electronics protection
Product Details
- Fuse type: JJN (Class T)
- Current rating: 350 Amp
- Interrupt capacity (AIC): 20,000 Ampere Interrupt Capacity (AIC)
- UL rating: DC applications under UL189L
- SKU: 661-5120
- Variant weight on file: 136 grams
Parts Desk Insights
Best Use Case: Use this Class T fuse as the fast short-circuit protection element in a properly matched Class T fuse block system for high-amperage DC equipment such as inverters.
Common Issues: Avoid installing the fuse in an incorrectly sized fuse block. If nuisance operation occurs, re-check conductor sizing and the overall fuse system (fuse block type and mating connections) per your system’s wiring design and service documentation.
Related Products & Accessories
- Browse Fuse Block options for Class T fuses - Pairing this fuse with the correct Class T fuse block is essential for a proper, secure installation.
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.