Littelfuse LA070URD31TTI0350 - VERY FAST-ACTI SEMICOND FUSE 31TTI0350. 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

LA070URD31TTI0350

UPC: 079458153903

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Overview

The Littelfuse LA070URD31TTI0350 is a North American style, square body, very fast-acting semiconductor fuse engineered for ultimate protection of power conversion equipment. This fuse provides maximum flexibility in equipment design with its multiple mounting styles and a broad range of ampere ratings within a given body size. It is specifically designed to provide state-of-the-art protection for sensitive semiconductor devices including SCRs, diodes, thyristors, GTOs, and IGBTs. The construction features pure die-cut elements embedded in solidified sand, a critical design element that effectively controls arcing and significantly lowers I²t values, thereby minimizing damage to protected components. All Littelfuse square body fuses, including the LA070URD31TTI0350, are equipped with a blown fuse trip indicator for easy visual confirmation of operation and efficient maintenance. Key features include superior cycling ability for long, reliable life under high cyclic loading and extremely fast-acting, current-limiting performance for enhanced equipment protection. Applications for the LA070URD31TTI0350 include the protection of rectifiers, inverters, DC drives, UPS systems, reduced voltage motor starters, and other globally accepted power electronic applications. Manufacturer: Littelfuse. SKU: LA070URD31TTI0350. UNSPSC Code: 39121628. Country of Origin: US.
  • Very fast-acting and current-limiting for improved equipment protection
  • Pure die-cut elements embedded in solidified sand control arcing and lower I²t
  • Blown fuse trip indicator for visual confirmation and efficient maintenance
  • Superior cycling ability ensures long, reliable life on high cyclic loading
  • Multiple mounting styles and broad ampere ratings offer design flexibility

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
350 A
Material
Silica Sand with Die-Cut Elements
Mounting Type
Multiple mounting styles
Series
31TTI Series
Size
Square body (North American style)
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

LA70QS10-14FI

Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.
VERY FAST-ACTI SEMICOND FUSE 70LI0200. 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.

LA130URD70LI0200

VERY FAST-ACTI SEMICOND FUSE 70LI0200. 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 French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.

LA70QS40-14F

Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.
The Littelfuse LA15QS series semiconductor fuses were designed for the specific protection of diodes and other semiconductor devices rated 150VAC/DC. The LA15QS product lines compact design is perfect for those applications that have limitations on available space.

LA15QS600-4

The Littelfuse LA15QS series semiconductor fuses were designed for the specific protection of diodes and other semiconductor devices rated 150VAC/DC. The LA15QS product lines compact design is perfect for those applications that have limitations on available space.
Littelfuse's LA100P semiconductor protection fuses are rated 1000V, extending the range of protection for UPS systems, AC and DC drives, reduced voltage motor starters and similar applications where lower l2t and superior reliability are needed. With ratings from 15-1000 amperes, a wide range of high voltage applications can be served. Features: Low l2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Applications: Protection of UPS systems, AC/DC drives, reduced voltage motor starters and other 1000V or less semiconductor devices.

LA100P200-4TI

Littelfuse's LA100P semiconductor protection fuses are rated 1000V, extending the range of protection for UPS systems, AC and DC drives, reduced voltage motor starters and similar applications where lower l2t and superior reliability are needed. With ratings from 15-1000 amperes, a wide range of high voltage applications can be served. Features: Low l2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Applications: Protection of UPS systems, AC/DC drives, reduced voltage motor starters and other 1000V or less semiconductor devices.

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.