Littelfuse L15S Series Very Fa...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$32.94
Littelfuse L15S Series Very Fast-Acting Semiconductor Fuse, 150VAC/150VDC

Littelfuse L15S Series Very Fast-Acting Semiconductor Fuse, 150VAC/150VDC

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Model: L15S008

In Stock (leaves warehouse same day if ordered before 3pm ET)

$32.94
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Littelfuse L15S Series Very Fast-Acting Semiconductor Fuse, 150VAC/150VDC

The Littelfuse L15S Series is a line of Very Fast-Acting (FF) semiconductor fuses engineered to provide supplementary protection for solid-state devices such as SCRs, diodes, thyristors, triacs, and transistors, available in ampere ratings from 8A to 100A. Rated 150VAC/150VDC, these fuses open with no intentional time delay, and the series carries a 100,000 A.I.R. interrupting rating (20,000A @ 100VDC) to reliably clear overcurrents in demanding power electronics. Littelfuse semiconductor fuses are UL Recognized, making them suitable for supplementary protection in UL Listed equipment.

Key Features

  • Amp Rating Range: Available from 8A to 100A to match the overcurrent protection needs across a wide range of semiconductor devices.
  • Voltage Rating: 150VAC / 150VDC for use across both AC and DC power electronic circuits.
  • Very Fast-Acting (FF) Opening: Extremely fast, current-limiting response with no intentional time delay, ideal where standard fuses are too slow.
  • Interrupting Rating: 100,000 A.I.R. for the series, with 20,000A @ 100VDC, to meet demanding system requirements.
  • Extremely Current Limiting: Low I2t and peak let-through currents help meet the protection requirements of most semiconductor devices.
  • UL Recognized Construction: Manufactured using Littelfuse-developed metallurgical, polymer, and materials technology for accuracy and predictable performance.

Certifications & Compliance

  • UL Recognized (Components Program)
  • CSA Certified
  • CE Marked

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Variable Speed Drives
  • Power Rectifiers
  • UPS Systems
  • DC Power Supplies
  • Protection of SCRs, Diodes, Thyristors, and Triacs
  • Solid-State Power Electronic Equipment

Why Littelfuse?

Littelfuse applies advanced metallurgical, polymer, and materials research along with mathematical modeling and computerized statistical analysis to engineer fuses that deliver accuracy, consistent quality, and predictable performance. The L15S Series is UL Recognized under the components program of Underwriters Laboratories, giving specifiers confidence when protecting variable speed drives, power rectifiers, UPS systems, and other solid-state power equipment across the full 8A to 100A rating range. Choose Littelfuse semiconductor fuses for extremely current-limiting, fast-acting protection built to today's demanding power electronics standards.

Product Specs

Listing:
UL Recognized
Product Type:
Semiconductor Fuse
Series:
L15S Series
Voltage Rating:
150VAC/150VDC
Amperage Rating:
8A - 100A
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse L15S008 – Frequently Asked Questions

1) Will a Littelfuse L15S fuse protect the SCRs and diodes in a variable speed drive?
That is what the L15S Series is built for. It is a very fast-acting (FF) semiconductor fuse that opens with no intentional time delay, with low I2t and low peak let-through current so it clears faster than the silicon it sits in front of can be damaged. Littelfuse lists it for SCRs, diodes, thyristors, triacs and transistors in variable speed drives, power rectifiers, UPS systems and DC power supplies. A standard branch-circuit or time-delay fuse is too slow for that job.
2) What voltage can the Littelfuse L15S be used on, and can it be used on DC?
The L15S is rated 150VAC and 150VDC, so it works in either AC or DC power electronic circuits up to 150V. Interrupting rating is 100,000 A.I.R. for the series, with 20,000A at 100VDC. If your bus is above 150V, this is the wrong series and you need a higher-voltage semiconductor fuse.
3) Is the Littelfuse L15S UL Listed, and can I use it in UL Listed equipment?
The L15S is UL Recognized under the UL components program, not UL Listed as a standalone device. That makes it acceptable for supplementary protection inside UL Listed equipment, which is exactly how semiconductor fuses are normally applied. It is also CSA Certified and CE Marked. It is not a substitute for the branch-circuit protective device ahead of your panel.
4) What Bussmann semiconductor fuse would be considered instead of a Littelfuse L15S?
The Littelfuse L15S Series is a very fast-acting semiconductor fuse rated 150VAC/150VDC in ampere ratings from 8A to 100A. Bussmann's semiconductor fuse lines cover the same protection role, including the KAW Series and the FBP Series, which is a non-indicating blade-end semiconductor fuse. Match the voltage rating and ampere rating of the Bussmann part to the circuit before substituting, since the L15S is a 150V device and the Bussmann series span a range of voltage classes.
5) I need a semiconductor fuse for a 1000VDC drive link - can I use the L15S?
No. The Littelfuse L15S Series is rated 150VAC/150VDC, so it is not suited to a 1000VDC bus. For that voltage class, the Bussmann KAX Series is a 1000VDC non-indicating semiconductor fuse, and the Bussmann SF100X1000HP Series is also a semiconductor fuse offering. The L15S remains the choice for 150V and below AC or DC power electronics.
6) What amp ratings does the Littelfuse L15S come in?
The L15S Series spans 8A to 100A. Catalogued ratings include L15S008 at 8A, L15S010 at 10A and L15S100 at 100A, with the part number carrying the ampere value in the last three digits.
7) How do I order the right L15S part number for my amp rating?
Specify by amperage. The ordering code is L15S plus a three-digit ampere value, so 8A is L15S008, 10A is L15S010 and 100A is L15S100, across the 8A to 100A range. Voltage is fixed at 150VAC/150VDC for the whole series, so amperage is the only selection you make.
8) What other brands of semiconductor fuse are there if the 150V Littelfuse L15S is too low a voltage?
For higher-voltage DC links, look at the Bussmann KAX Series, which is a 1000VDC non-indicating semiconductor fuse. Bussmann also offers the KAW Series and the SF100X1000HP Series semiconductor fuses, plus the FBP Series in a blade-end non-indicating style. The L15S itself tops out at 150VAC/150VDC, so above that it is not a candidate.
9) Can I replace a standard fast-acting fuse in a drive with an L15S semiconductor fuse?
Only if the drive's protection scheme calls for a semiconductor fuse. The L15S is a Very Fast-Acting (FF) class device intended for supplementary protection of solid-state components, and it is not a branch-circuit fuse. Match the existing device's class, voltage and amperage: the L15S covers 8A to 100A at 150VAC/150VDC, and swapping an FF fuse in where the equipment maker specified a time-delay or branch-circuit fuse will nuisance-open on inrush.
10) We standardize on Bussmann in our plant - what changes if we move an L15S position over?
Functionally both are semiconductor fuses for protecting SCRs, diodes, thyristors and transistors. The Littelfuse L15S Series covers 8A to 100A at 150VAC/150VDC with very fast-acting opening and is UL Recognized. On the Bussmann side the comparable semiconductor lines are KAW, FBP, KAX and SF100X1000HP, which differ in voltage class and terminal style, so each L15S position needs its ampere rating, voltage and mounting verified against the specific Bussmann series rather than swapped series-for-series.
11) Where do I find the let-through and I2t curves for the Littelfuse L15S?
Littelfuse publishes the L15S Series spec sheet and the full Littelfuse product catalog, both linked on the product record, and those carry the time-current, I2t and peak let-through data you need to coordinate the fuse with your semiconductor's withstand rating. The description gives the headline numbers only: 150VAC/150VDC and 100,000 A.I.R. with 20,000A at 100VDC.
12) Is an indicating semiconductor fuse available if I want visual blown-fuse status?
The Bussmann FBP Series and KAX Series are both non-indicating semiconductor fuses, so neither provides a visual blown indicator. The Littelfuse L15S Series is a very fast-acting semiconductor fuse that is UL Recognized under the components program; if you need status indication, plan on a separate blown-fuse indicator or monitored holder rather than relying on the fuse body.
How fast can I get the Littelfuse L15S008 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse L15S008 come with a warranty?
Absolutely. The Littelfuse L15S008 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse L15S008?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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