Littelfuse L50QS125.TX100 - The L50QS series is a next-generation high-speed fuse with optimized circuit protection for the safeguarding of sensitive, high-power semiconductor devices. These products are found in various sectors including pulp, paper and processing industries, cranes and heavy-lifting equipment, wastewater treatment plants, large factories and MRO facilities. These POWR-SPEED fuses are extremely current limiting and are designed with lower energy let-through (I2t) characteristics, to provide balanced performance and extend longevity while lowering potentially equipment-damaging heat energy. They are designed in the traditional North American bolted-style package and include a universal mounting option to meet customer requirements for a variety of application installation configurations.
Littelfuse

L50QS125.TX100

Alternate Item Number: L50QS125.TX100

UPC: 079458637335


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Specification Sheet

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Minimum Qty: 10

Multiplier: 10

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Overview

The Littelfuse L50QS125.TX100 is a high-speed fuse designed for optimized circuit protection of sensitive, high-power semiconductor devices. Part of the L50QS series, this fuse features extreme current-limiting capabilities with lower energy let-through (I2t) characteristics, reducing potentially damaging heat energy while extending equipment longevity. Engineered in a traditional North American bolted-style package, the L50QS125.TX100 includes a universal mounting option for flexible installation across diverse industrial configurations. This fuse is ideal for protecting power converters, drives, and control circuits in demanding environments such as pulp and paper mills, wastewater treatment plants, cranes, heavy-lifting equipment, and large factories. The L50QS series leverages Littelfuse’s POWR-SPEED™ technology to deliver rapid response times critical for safeguarding modern semiconductor devices. With balanced performance and reduced watt loss, these fuses minimize thermal stress on protected equipment, ensuring reliable operation under cyclic loading conditions. The L50QS125.TX100 is a direct replacement for legacy semiconductor fuses, offering improved protection metrics and compact sizing for space-constrained applications. Trust Littelfuse’s proven expertise in industrial protection to safeguard your critical power electronics.
  • Extreme current-limiting for semiconductor device protection
  • Lower I2t characteristics reduce heat energy and extend equipment life
  • Traditional North American bolted-style package with universal mounting
  • Compatible with power converters, drives, and control circuits
  • Optimized for pulp/paper, wastewater, cranes, and heavy-lifting equipment
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 Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

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

9F61BWW460

9F61 Size B Clips 1.6in
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.

Frequently Asked Questions

What voltage rating does the L50QS125.TX100 support?

The L50QS series is designed for 500V or less applications, ensuring compatibility with most industrial power electronics.

Is the L50QS125.TX100 compatible with existing bolted fuse holders?

Yes, it is designed in a traditional North American bolted-style package for direct replacement compatibility.

Can the L50QS125.TX100 protect motor drives?

Yes, it is specifically designed for protecting motor drives, UPS systems, and inverters in industrial applications.

How does the L50QS125.TX100 improve equipment longevity?

Lower I2t characteristics reduce thermal stress during faults, minimizing heat damage and extending semiconductor device life.

What is the advantage of lower I2t in this fuse?

Lower I2t reduces energy let-through during faults, minimizing thermal stress and improving semiconductor protection.

What industries use the L50QS125.TX100?

Common applications include pulp/paper mills, wastewater treatment, cranes, heavy-lifting equipment, and large factories.

What is the mounting type for the L50QS125.TX100?

The fuse features a bolted-style package with universal mounting options for flexible installation.

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.