Littelfuse LA100P350-4TI - 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.
Littelfuse

LA100P350-4TI

Alternate Item Number: LA100P3504TI

UPC: 079458151947

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Overview

Littelfuse LA100P350-4TI semiconductor protection fuses are engineered to deliver unmatched reliability and performance in high-voltage industrial applications. Rated for 1000V and available in current ratings from 15 to 1000 amperes, these fuses provide critical protection for sensitive semiconductor devices in demanding environments. The LA100P series is specifically designed to safeguard UPS systems, AC and DC drives, reduced voltage motor starters, and other high-performance semiconductor applications where operational integrity and system longevity are paramount. Semiconductor protection fuses like the LA100P350-4TI play a vital role in preventing catastrophic failures by interrupting fault currents before they can damage critical components. Unlike standard fuses, semiconductor protection fuses are optimized for low let-through energy (I²t), which minimizes thermal and mechanical stress on protected devices during short-circuit events. This low I²t characteristic ensures that even the most sensitive semiconductors—such as IGBTs, thyristors, and MOSFETs—remain undamaged, preserving system uptime and reducing costly repairs. The LA100P350-4TI fuse features controlled arc voltage during clearing, a key innovation that reduces stress on downstream circuit components. This controlled interruption process prevents voltage spikes that could otherwise damage capacitors, transistors, or other sensitive electronics. For engineers and maintenance professionals, this means fewer system failures, extended equipment life, and improved safety in high-voltage installations. The fuse’s high breaking capacity and precise time-current characteristics make it ideal for applications where reliability cannot be compromised, such as renewable energy systems, industrial automation, and critical infrastructure. Selecting the right semiconductor protection fuse requires careful consideration of voltage ratings, current ratings, and application-specific requirements. The LA100P350-4TI is rated for 1000V and 350A, making it suitable for medium to high-power applications where fast-acting protection is essential. Its compact design and robust construction allow for easy integration into existing systems, whether in panelboards, motor control centers, or power distribution units. Professionals in industries such as manufacturing, energy, and transportation rely on Littelfuse’s semiconductor protection fuses for their proven performance in harsh operating conditions, including high temperatures, vibration, and electrical noise. Littelfuse, a global leader in circuit protection solutions, has been trusted by engineers and OEMs for over a century. The company’s semiconductor protection fuses are the result of decades of research and development, incorporating advanced materials and manufacturing techniques to ensure consistent performance. The LA100P series, in particular, is backed by Littelfuse’s rigorous testing and quality control processes, providing peace of mind in mission-critical applications. Whether protecting a UPS system in a data center, a variable frequency drive in a factory, or a motor starter in a renewable energy installation, the LA100P350-4TI delivers the reliability and precision required to maintain operational excellence. For professionals seeking a semiconductor protection fuse that combines high performance, durability, and ease of installation, the Littelfuse LA100P350-4TI is an outstanding choice. Its low I²t, controlled arc voltage, and wide current range make it a versatile solution for a broad spectrum of high-voltage applications. Trust Littelfuse to provide the protection your systems need to operate safely and efficiently, today and in the future.
  • 1000V rated semiconductor protection fuse for high-voltage applications
  • Low I²t minimizes damage to sensitive semiconductors during short circuits
  • Controlled arc voltage reduces stress on circuit components during clearing
  • Current ratings from 15-1000A for versatile application coverage
  • Ideal for UPS systems, AC/DC drives, reduced voltage motor starters, and semiconductor devices

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
350 A
Series
LA100P
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
1000 V
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 Block 600VAC 600VDC Class CC 30A 3-Pole Screw with Reinforced Clip

30313R

Fuse Block 600VAC 600VDC Class CC 30A 3-Pole Screw with Reinforced Clip
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 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.