Littelfuse LA070URD31LI0500 - VERY FAST-ACTI SEMICOND FUSE 31LI0500. Littelfuse North American style square body high-speed 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 SCRs, diodes, thyristors, GTOs, and IGBT devices, Littelfuse square body fuses have pure die-cut elements embedded in solidified sand to control arcing and lower I2t. 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 I2t 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

LA070URD31LI0500

UPC: 079458153712

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Overview

The Littelfuse LA070URD31LI0500, part of the robust LA series, is a premier very fast-acting semiconductor fuse engineered for the demanding protection requirements of modern power conversion equipment. Designed with a North American style square body (size 070), this 500A fuse offers exceptional flexibility in equipment design and delivers ultimate protection for critical components such as SCRs, diodes, thyristors, GTOs, and IGBTs. Littelfuse's commitment to advanced protection technology is evident in the construction of this fuse, featuring pure die-cut elements embedded within solidified silica sand. This specialized construction is crucial for effectively controlling arcing and significantly lowering the I²t (current squared times time) value, thereby minimizing potential damage to sensitive semiconductor devices during fault conditions. This fuse is not just about fault interruption; it's about preserving the integrity and longevity of your power electronics. The extremely fast-acting and current-limiting nature of the LA070URD31LI0500 ensures that fault currents are interrupted with unparalleled speed, safeguarding expensive power modules from catastrophic failure. Furthermore, its superior cycling ability makes it an ideal choice for applications experiencing high cyclic loading, promising a long and reliable operational life even under strenuous conditions. Each fuse is equipped with a reliable blown fuse trip indicator, providing clear visual confirmation of activation, which is essential for efficient maintenance and troubleshooting in industrial environments. The versatility of the Littelfuse LA series is a key advantage for equipment designers. The LA070URD31LI0500 is available in multiple mounting styles, allowing for seamless integration into a wide array of equipment configurations. Coupled with a broad range of ampere ratings within a given body size, this fuse provides the design flexibility necessary to optimize performance and space utilization. Its applications span across critical industrial sectors, including the protection of rectifiers, inverters, DC drives, uninterruptible power supply (UPS) systems, reduced voltage motor starters, and other vital power electronics equipment used in globally accepted applications. Trust Littelfuse, a recognized leader in circuit protection, for your most critical power semiconductor protection needs with the LA070URD31LI0500.
  • Very fast-acting and current-limiting for superior semiconductor protection
  • Pure die-cut elements embedded in solidified silica sand for controlled arcing and low I²t
  • North American style square body (size 070) with multiple mounting style options
  • Broad range of ampere ratings for design flexibility
  • Equipped with a blown fuse trip indicator for easy fault identification

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
500 A
Material
Silica sand with pure die-cut elements
Mounting Type
Multiple mounting styles
Series
LA Series
Size
Size 070
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.