Sapphire Energy
Class T Fuse Holder
Class T Fuse Holder
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This heavy-duty Class T fuse holder is designed for clean, reliable installation in high-current DC battery systems. It provides a secure mounting solution for large inverters and lithium battery banks where fault currents can be extreme.
The base is constructed from a heat-resistant, electrically insulating material, helping maintain stability and safety in demanding environments such as solar, marine, RV, and off-grid installations.
- Designed for Class T fuses — ideal for high-current lithium battery systems
- M8 (5/16") stud terminals — compatible with common high-current battery lugs
- Heat-resistant base — built for reliability in demanding DC environments
- Secure mounting solution — suitable for inverters and parallel battery banks
- Clean, serviceable layout — easy access for inspection or fuse replacement
| Fuse Compatibility | Class T, MEGA |
|---|---|
| Maximum Supported Current | Up to 400 A (fuse dependent) |
| Stud / Lug Size | M8 (5/16") |
| Base Construction | Heat-resistant, electrically insulating material |
| Mounting Type | Surface mount |
| Application | Solar, marine, RV, lithium battery systems, inverters, and high-current DC installations |
- 1 × Class T Fuse Holder
- Protective cover*
*Please note: cover color may be blue or clear, depending on production batch.
This listing is for the fuse holder only. A compatible fuse is required for operation. Product images may show fuses installed for demonstration purposes.
Does this fuse holder include a fuse?
No. This product includes the fuse holder only. A compatible fuse is required for operation. You can purchase a Class T fuse here, or choose the fuse + holder bundle for a ready-to-install solution.
What fuse types can be used with this holder?
This holder is designed primarily for "bent tab" style Class T fuses, which are commonly used for high-current lithium battery systems. It may also accept MEGA fuses within the supported current range, depending on fuse dimensions.
Be aware that there are multiple physical sizes/configurations for Class T fuses, and you should check fitment/dimensions before ordering if you are unsure.
Feel free to contact us if you are unsure.
Shop for compatible Class T fuses
What stud size does this holder use?
The studs are M8 (5/16"), compatible with common high-current battery cable lugs.
M10 (3/8") cables will still likely work. Ensure good surface contact (between cable and fuse) and always test/inspect your wiring for heat.
Does this work with solar power systems?
Yes. This fuse holder is commonly used in solar power systems to protect battery banks, inverter connections, and high-current DC circuits. It is especially well suited for lithium-based solar systems with large inverters or parallel batteries.
Is this suitable for lithium battery systems?
Yes. Class T fuse holders are widely used in lithium battery systems, particularly where high fault current capability requires robust DC protection.
Can this be used in marine or RV environments?
Yes. This holder is well suited for demanding DC environments such as marine, RV, and off-grid solar installations.
How do I choose the correct fuse size?
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.
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Studs are further apart than the 125A Littlefuse Class T I bought from BlueSea. Am I missing something?
Hi Brenden — great question, and thanks for including the photo — that helps a lot.
What you’re running into is that Class T fuses come in a couple of different physical tab layouts, and they’re not all interchangeable with every holder.
The fuse you have (Littelfuse) uses a centerline tab design, while this holder is built for the “L-foot” style, where the mounting tabs sit out at the edges of the fuse body. That’s why it won’t seat correctly.
It’s an easy mistake to make. We’ve added photos showing the compatible fuse style, but we’ll take another look at how we can make this even clearer for future customers.
Thanks for the feedback, and please reach out to support (you can reply to your purchase confirmation email) and we'll see what we can do to help you out.