Littelfuse L15S450 - The L15S series is a traditional North American Bolted style high-speed fuse for protection of power semiconductor devices that are rated up to 150 V ac and up to 150 V dc Littelfuse POWR-SPEED ® products offer optimized circuit protection at the extremely fast speed required to protect power semiconductor devices such as silicon controlled rectifiers (SCR’s), diodes, thyristors, triacs, transistors, and similar solid-state devices. These devices are used in power equipment including variable speed drives, power rectifiers, UPS systems, dc power supplies, and in a wide range of electronic equipment. May be used wherever extremely fastacting, current-limiting fuses with no time delay are required.
Littelfuse

L15S450

Alternate Item Number: L15S450.T

UPC: 079458002492


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Overview

The Littelfuse L15S450 is a traditional North American bolted-style high-speed fuse, engineered for the critical protection of power semiconductor devices. Rated for 150 V AC and 150 V DC, this 450A fuse is part of the Littelfuse POWR-SPEED® L15S series, delivering optimized circuit protection with extremely fast-acting, current-limiting capabilities where no time delay is acceptable. Its robust construction features a melamine body and silver-plated copper alloy caps, ensuring durability in demanding industrial environments. The L15S450 offers a substantial interrupting rating of 100 kA AC and 20 kA DC (self-certified), providing reliable protection against overcurrents. Designed with bolted tags, it allows for direct bus-bar or stud mounting, facilitating secure installation and minimizing maintenance requirements. This fuse is UL Recognized (File: E71611) and CSA Recognized (File: LR29862), meeting stringent US and Canadian safety standards. Common applications include variable speed drives, power rectifiers, UPS systems, DC power supplies, industrial heaters, battery chargers, and soft starters. The L15S450 operates reliably across a wide temperature range of -55°C to +125°C and is RoHS compliant. For optimal performance, pair with recommended fuse holders such as the 1LFS101/1LFS102 or LSCR001/LSCR002. Trust Littelfuse's POWR-SPEED® technology for essential protection of sensitive solid-state devices like SCRs, diodes, thyristors, triacs, and transistors.
  • 150 V AC / 150 V DC voltage rating for versatile power semiconductor protection.
  • 450 A current rating for high-capacity applications.
  • Extremely fast-acting, current-limiting performance with no time delay.
  • Traditional North American bolted style with bolted tags for direct bus-bar or stud mounting.
  • UL Recognized (E71611) and CSA Recognized (LR29862) for compliance and reliability.
  • Operating temperature: -55°C to +125°C
  • Direct bus-bar or stud mount bolted-style design
  • Compatible with variable speed drives, UPS systems, and power rectifiers

Specifications

Application
Semiconducting Devices
Brand Name
Littelfuse
Connection Type
Bolted connection
Current Rating
450 A
Material
Melamine body with silver-plated copper alloy caps
Mounting Type
Bolted tag mounting (direct bus-bar or stud mounting)
Series
L15S
Special Features
Very Fast Acting
Standard
CSA Certified
Sub Brand
L15S Series
Type
Semiconductor Fuses
Voltage Rating
150 V AC/DC
Package Weight (Imperial)
0.176 L
Package Weight (Metric)
0.080 kg
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

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Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.