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

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.