Littelfuse LA30QS100-4TI - The Littelfuse LA30QS series Semiconductor protection fuses are intended for the protection of Power Semiconductors such as Diodes, Phase Control SCR and other Power Semiconductor devices. The LA30QS is recommended for new applications providing solutions for your critical protection needs at 300V and less semiconductors. Features: Low l2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Choice of mounting types provides options for unique termination requirements. Indicator options allow identification of blown fuses. Superior DC capabilities. Applications: Protection of 300 volt heavy duty rectifiers and similar heavy duty power supplies.
Littelfuse

LA30QS100-4TI

Alternate Item Number: LA30QS1004TI

UPC: 079458161243


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Overview

The Littelfuse LA30QS100-4TI Semiconductor Protection Fuse is a high-performance, UL-listed fuse designed to safeguard critical power semiconductor devices in industrial and commercial applications. Part of the renowned LA30QS series, this 300V, 100A fuse delivers superior protection for diodes, phase control SCRs, thyristors, and other high-power semiconductor components operating at voltages up to 300V. Engineered for reliability in demanding environments, the LA30QS100-4TI is ideal for protecting heavy-duty rectifiers, inverters, motor drives, and similar high-current power conversion systems where operational continuity and component safety are paramount. Key features of the Littelfuse LA30QS100-4TI include low I²t (integral of current squared over time), which minimizes thermal and mechanical stress on protected components during short-circuit events. This characteristic is critical in preserving the integrity of sensitive semiconductors, reducing the risk of catastrophic failure and costly downtime. Additionally, the fuse incorporates controlled arc voltage during clearing, which helps maintain system stability by limiting voltage transients that could damage downstream components. The inclusion of indicator options enables quick visual identification of blown fuses, streamlining maintenance and troubleshooting in fast-paced industrial settings. The LA30QS100-4TI offers versatile mounting options to accommodate diverse termination requirements, including bolt-on, blade, and other configurations, ensuring compatibility with a wide range of panel designs and enclosure systems. This flexibility simplifies integration into new installations or retrofits, reducing engineering time and installation complexity. With superior DC performance, the fuse is particularly well-suited for applications involving direct current, such as battery chargers, solar inverters, and DC motor controllers, where consistent and predictable protection is essential. Typical applications for the Littelfuse LA30QS100-4TI include protection of 300V heavy-duty rectifiers in industrial power supplies, phase-controlled SCR circuits in motor drives, and high-current semiconductor devices in traction systems. It is also widely used in renewable energy systems, where robust protection is required to handle variable loads and fault conditions. The fuse’s design aligns with industry standards for semiconductor protection, making it a trusted choice among engineers and technicians who prioritize safety, reliability, and performance. Littelfuse, a global leader in circuit protection solutions, has built a reputation for delivering high-quality fuses that meet the stringent demands of modern power electronics. With decades of experience and a commitment to innovation, Littelfuse provides products that enhance system safety and longevity. The LA30QS series, in particular, is recognized for its precision engineering and adherence to performance benchmarks, ensuring that critical applications remain protected under all operating conditions. For professionals seeking a dependable semiconductor protection fuse, the Littelfuse LA30QS100-4TI offers a proven solution backed by industry-leading support and technical expertise.
  • 300V voltage rating with 100A current capacity for heavy-duty semiconductor protection
  • Low I²t minimizes thermal stress on protected components during short circuits
  • Controlled arc voltage reduces stress on circuit components during fuse clearing
  • Multiple mounting types and indicator options for installation flexibility
  • Superior DC capabilities ideal for rectifiers, inverters, and motor drives

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
100 A
Mounting Type
Bolt-on, blade, and other configurations
Series
LA30QS
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
300 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 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.