Fuse JJN (Class T) 250 Amp
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You have 30 days to request a return. All sale items are final sale.
Protect high-amperage DC electronics circuits with a Class T fuse built for fast short-circuit response. Rated for 250 Amp and certified for high interrupt capacity for DC applications.
Key Features
- Fast short circuit response helps protect high-amperage electronics equipment such as inverters.
- 20,000 Ampere Interrupt Capacity (AIC) UL rated for DC applications under UL189L.
Intended Use
- DC circuit protection for marine and RV power systems
- Inverter branch circuit protection (where a Class T fuse is specified)
- Battery bank and high-current electronics protection (with compatible Class T fuse blocks/holders)
Product Details
- Product: Fuse JJN (Class T) 250 Amp
- SKU/Item: 661-5118
- Class: Class T fuse (JJN series)
- Amperage rating: 250 Amp
- Interrupt capacity: 20,000 Ampere Interrupt Capacity (AIC)
- Regulatory rating: UL rated for DC applications under UL189L
Parts Desk Insights
Best Use Case: Use this Class T fuse when your system requires a very fast-acting, high-interrupt-capacity DC protection device—commonly in inverter feed protection setups with a compatible Class T fuse block/holder.
Common Issues: If the fuse is repeatedly opening, verify the downstream wiring/load sizing and ensure the correct fuse amperage is selected for the system. Also confirm the fuse is installed in the correct Class T fuse holder/block for proper mounting and contact.
Related Products & Accessories
- Fuses - Browse additional fuses and Class T options to match your circuit protection requirements.
- Electrical & Accessories - Browse compatible electrical accessories and circuit protection components.
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.