Fuse JJN (Class T) 300 Amp
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Fuse JJN (Class T) 300 Amp is a very fast-acting, high-interrupt-capacity fuse designed for reliable DC short-circuit protection in demanding power systems—ideal for protecting high-amperage equipment such as inverters.
Key Features
- Fast short-circuit response helps protect high-amperage electronics equipment such as inverters.
- 20,000 Ampere Interrupt Capacity (AIC) rated for DC applications (UL listed under UL 189L).
Intended Use
- DC electrical systems requiring high-speed short-circuit protection
- Inverter power protection
- Marine and off-grid power distribution systems using Class T fuse protection
Product Details
- - Product: Fuse JJN (Class T) 300 Amp
- - SKU: 661-5119
- - Amp rating: 300 Amp
- - Interrupt rating: 20,000 Ampere Interrupt Capacity (AIC)
- - UL rating: UL 189L for DC applications
Parts Desk Insights
Best Use Case: Choose this Class T fuse when you need very fast short-circuit response and a high interrupt rating for a DC power distribution line—commonly in systems like inverter protection.
Common Issues: If a fuse repeatedly opens, verify the connected load/wiring condition and ensure the correct Class T fuse size and compatible fuse block/holder are used for the system’s protection scheme.
Related Products & Accessories
- Fuse Blocks & Fuse Holders (Class T) - Pair with a compatible Class T fuse block/holder appropriate for your system’s wiring and protection layout.
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.