Sapphire Energy
Class T Fuse – 250 V DC, 10 kA AIC (UL)
Class T Fuse – 250 V DC, 10 kA AIC (UL)
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Designed for modern high-current DC systems, these UL Recognized Class T fuses provide fast, reliable protection for large lithium battery banks and inverter-driven loads. With a 250 V DC rating and a 10 kA interrupt capacity, Class T fuses are the preferred choice where fault currents exceed the limits of ANL or MEGA fuses — especially in parallel battery configurations.
Each fuse features a ceramic body for thermal stability and arc containment, along with robust bolted terminals designed for consistent electrical performance and predictable behavior under both surge and fault conditions.
Commonly used in off-grid solar, marine, RV, and high-power DC systems, these aR Class T fuses are engineered to provide rapid short-circuit protection while accommodating the brief surge currents commonly encountered in inverter-based power systems.
- Robust ceramic construction — Designed for long-term reliability in demanding electrical environments
- High DC voltage rating — 250 V DC for modern lithium systems
- High interrupt capacity — 10 kA AIC for serious fault protection
- UL Recognized Component — evaluated to UL 248-1 and UL 248-14 standards
- Ideal for parallel battery banks — where fault currents can be extreme
- Ceramic body construction — stable, predictable performance under fault conditions
| Fuse Type | Class T (C2 Series) |
|---|---|
| Voltage Rating | 250 V DC |
| Interrupt Rating | 10 kA AIC |
| Ampacity Range | 100 A – 400 A (variant dependent) |
| Certification | UL Recognized Component (UL 248-1 / UL 248-14) |
| Utilization Category | aR (partial-range current-limiting fuse) |
| Construction | Ceramic body with bolted conductive terminals |
| Application | Lithium battery banks, inverters, marine, solar, RV, and high-current DC systems |
Fuse amp rating should be selected based on cable size, inverter requirements, and system design. For best performance and service life, the manufacturer recommends limiting continuous current to approximately 80% of the fuse's rated value. Class T fuses are commonly used on large inverters and parallel lithium battery banks where fault currents can exceed the safe limits of ANL or MEGA fuses.
Choose the holder for existing systems, or grab the bundle for a one-click, ready-to-install solution.
Why should I use a Class T fuse instead of ANL or MEGA?
Class T fuses offer significantly higher interrupt ratings and faster fault-clearing performance than ANL or MEGA fuses. They are the preferred choice for large lithium battery banks, parallel battery configurations, and high-power inverters where potential fault currents can exceed the safe limits of lower-rated fuse types.
Can this fuse handle inverter surge currents?
Yes. Class T fuses are designed to tolerate short-duration surge currents commonly seen during inverter startup or motor loads, while still clearing dangerous short-circuit faults rapidly.
Is this fuse suitable for lithium batteries?
Absolutely. These Class T fuses are commonly used to protect lithium battery systems, especially when batteries are connected in parallel and fault current capability is high.
What does UL Recognized mean?
This fuse is a UL Recognized Component evaluated to UL 248-1 and UL 248-14 for supplemental fuse applications. UL Recognition applies to components intended for installation within larger electrical systems and is commonly used for industrial electrical products such as fuses, relays, contactors, switches, and power supplies.
What industries commonly use Class T fuses?
Class T fuses are widely used in off-grid solar, marine, RV, commercial DC power systems, and high-power mobile installations.
What Holders Do These Fit?
Please be aware that there are multiple physical sizes and configurations of Class T fuses — they don't all fit all holders.
This type of Class T fuse fits our standard Class T Holder, and many others on the market. If you are unsure, please refer to the dimensional drawing image, or reach out and contact us.
These may not fit the Blue Sea holders designed for center-aligned mounting tabs.
How do I choose the correct amp rating?
Fuse size should be selected based on cable size, inverter requirements, and overall system design. The fuse is intended to protect wiring and equipment, not limit normal operating current. For best performance and service life, the manufacturer recommends keeping long-term continuous current at or below approximately 80% of the fuse rating.
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This fuse is great, it was so refreshing to find a company focused on providing quality UL products you can trust. Russ is great.