Littelfuse LA120URD73LI0800 - Littelfuse's North American style square body semiconductor fuses provide maximum flexibility in equipment design and ultimate protection for today's power conversion equipment. Available in different body sizes and multiple mounting styles, the broad range of ampere ratings allows great flexibility in equipment design. Engineered to provide state-of-the-art protection for SCR, diodes, thyristors, GTO, and IGBT devices, Littelfuse square body fuses have pure die-cut elements embedded in solidified sand to control arcing and lower l2t. All fuses are also equipped with a blown fuse trip indicator. Features: Choice of mounting styles provides a wide choice for equipment design. Broad range of ampere ratings in a given body size for design flexibility. Very low l2t minimizes damage to protected components. Superior cycling ability for long, reliable life on high cyclic loading. Extremely fast-acting and current limiting for improved protection to equipment. Applications: Protection of rectifiers, inverters, DC drives, UPS systems, reduced voltage motor starters, and other equipment in globally accepted applications.
Littelfuse

LA120URD73LI0800

Alternate Item Number: LA120URD73LI0800

UPC: 079458155433


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Overview

The Littelfuse LA120URD73LI0800, part of the robust 73LI Series, represents a pinnacle in semiconductor protection for demanding power conversion applications. Engineered with a North American style square body, this 800A fuse offers unparalleled flexibility in equipment design, ensuring optimal performance and safety for critical components. Its construction features pure die-cut elements meticulously embedded within solidified silica sand, a design choice that actively controls arcing and significantly lowers the l²t (let-through energy) value. This reduction in l²t is crucial for minimizing damage to sensitive semiconductor devices such as SCRs, diodes, thyristors, GTOs, and IGBTs, thereby extending equipment lifespan and reliability. Littelfuse's commitment to advanced protection is evident in the LA120URD73LI0800's superior cycling ability, making it exceptionally well-suited for high cyclic loading environments where frequent power fluctuations are common. The extremely fast-acting and current-limiting characteristics provide immediate and decisive protection, safeguarding valuable equipment from transient overcurrents and short circuits. Furthermore, each fuse is equipped with a clear blown fuse trip indicator, simplifying diagnostics and maintenance by providing an immediate visual alert when the fuse has operated. The versatility of the 73LI Series, including the LA120URD73LI0800, is further enhanced by its availability in multiple mounting styles and a broad range of ampere ratings within a given body size. This design flexibility empowers engineers to tailor protection solutions precisely to their equipment's unique requirements, optimizing space, cost, and performance. The applications for this high-performance fuse are extensive and critical across various industrial sectors. It is the ideal choice for protecting rectifiers, inverters, DC drives, Uninterruptible Power Supply (UPS) systems, and reduced voltage motor starters. These components are fundamental to the operation of data centers, renewable energy systems, industrial automation, electric vehicle charging infrastructure, and many other globally accepted applications where reliable power conversion is paramount. Choosing Littelfuse for your semiconductor protection needs means investing in a legacy of quality and innovation. The LA120URD73LI0800 embodies this commitment, offering a reliable, high-performance solution designed to meet the rigorous demands of modern power electronics. Its robust construction, advanced protection features, and design flexibility make it an indispensable component for ensuring the longevity and operational integrity of your most critical power conversion equipment.
  • 800A current rating for high-power applications.
  • North American style square body design for equipment flexibility.
  • Pure die-cut elements in solidified silica sand for controlled arcing and low l²t.
  • Extremely fast-acting and current-limiting for superior semiconductor protection.
  • Blown fuse trip indicator for easy diagnostics and maintenance.

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
800 A
Material
Silica Sand
Series
73LI
Size
Size 73
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
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Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

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Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

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9F61 Size B Clips 1.6in

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9F61 Size B Clips 1.6in
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.

LCC5

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.

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.