Littelfuse LA50QS80-4 - LA50 VERY FAST-ACTI SEMICOND FUSE QS80-4. In response to new equipment requirements, Littelfuse LA50QS series fuses were developed to improve the overall performance of semiconductor fuses. The LA50QS provides the best protection features including lower I2t, longer life when subjected to cyclic loading and lower watts loss. LA50QS is today’s choice for the protection of dynamic solid state equipment. Features: Lowest I2t for greatest protection of semiconductor circuits. Low watts loss for cooler operation. Superior cycling ability gives an equipment design advantage. State-of-the-art protection for 500 volt equipment. Ultra compact sizes allow down-sizing of existing equipment. Applications: Protection of 500 volts or less solid state equipment such as motor drives, UPS, inverters, etc.
Littelfuse

LA50QS80-4

Alternate Item Number: LA50QS804

UPC: 079458152166

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Overview

The Littelfuse LA50QS80-4 Very Fast-Acting Semiconductor Fuse (SKU: LA50QS80-4) is a high-performance protection solution engineered for modern solid-state equipment operating at 500 volts or less. Designed to meet the stringent demands of dynamic industrial applications, this fuse delivers unparalleled safeguarding for sensitive semiconductor circuits, ensuring reliability and longevity in critical systems. As part of Littelfuse’s esteemed LA50QS series, the LA50QS80-4 represents the gold standard in semiconductor fuse technology, combining advanced materials, precision engineering, and decades of industry expertise to provide superior protection where it matters most. At the core of the LA50QS80-4’s exceptional performance is its industry-leading I²t rating, which minimizes thermal stress on protected components during fault conditions. This ultra-low I²t characteristic ensures rapid response times, effectively isolating faults before they escalate into catastrophic failures. For engineers and system designers, this translates to enhanced circuit protection, reduced downtime, and lower maintenance costs. The fuse’s design also prioritizes energy efficiency, with significantly lower watts loss compared to conventional alternatives. This not only contributes to cooler operation—reducing thermal degradation and extending service life—but also supports compliance with energy efficiency standards in modern industrial equipment. One of the standout features of the LA50QS80-4 is its superior cycling ability, which allows it to withstand repeated thermal and electrical stress without compromising performance. This makes it an ideal choice for applications subjected to frequent load fluctuations, such as motor drives, uninterruptible power supplies (UPS), and inverters. The fuse’s ability to endure cyclic loading ensures consistent protection over time, even in the most demanding operating environments. Additionally, its ultra-compact size enables equipment downsizing without sacrificing protection capabilities, offering a practical solution for space-constrained installations. The LA50QS80-4 is specifically engineered for 500-volt solid-state equipment, making it a versatile choice for a wide range of industrial applications. Typical use cases include: - **Motor Drives:** Protecting variable frequency drives (VFDs) and servo motor controllers from overcurrent conditions. - **Uninterruptible Power Supplies (UPS):** Safeguarding critical power conversion stages in backup systems. - **Inverters:** Ensuring reliable operation in solar, wind, and grid-tied power conversion systems. - **Industrial Automation:** Providing protection for programmable logic controllers (PLCs) and other sensitive electronics. - **Renewable Energy Systems:** Supporting the protection of power electronics in solar inverters and battery management systems. Installation and integration of the LA50QS80-4 are straightforward, thanks to its standardized form factor and compatibility with existing fuse holders and mounting systems. Littelfuse provides comprehensive technical documentation, including datasheets, application notes, and installation guidelines, to assist engineers in optimizing system performance. The fuse’s design also aligns with industry standards for semiconductor protection, ensuring seamless integration into compliant equipment designs. Littelfuse, a global leader in circuit protection solutions, has built a reputation for innovation, reliability, and technical excellence. With over a century of experience, the company is trusted by industries worldwide to deliver high-performance protection products that enhance system safety and efficiency. The LA50QS series, including the LA50QS80-4, exemplifies Littelfuse’s commitment to advancing semiconductor protection technology, offering professionals a dependable solution for safeguarding critical infrastructure. Whether deployed in high-power industrial systems or precision electronic applications, the LA50QS80-4 stands as a testament to Littelfuse’s dedication to quality and performance.
  • Ultra-low I²t rating for maximum semiconductor circuit protection
  • Lower watts loss for cooler operation and extended service life
  • Superior cycling ability under repeated thermal and electrical stress
  • Ultra-compact design enables equipment downsizing
  • Ideal for motor drives, UPS, inverters, and renewable energy systems

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
80 A
Series
LA50QS
Size
Ultra compact
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
500 V 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.