Littelfuse L50S125 - Littelfuse L50S Series High-Speed Fuses are designed to protect today’s equipment and systems, and are manufactured with Littelfuse-developed technology that sets tomorrow’s standards for accuracy, consistent quality, reliability, and predictable performance. Littelfuse engineers have redefined High-Speed Fuse Technology by using advanced metallurgical, polymer, and materials research, mathematical modeling, and computerized statistical analysis.
Littelfuse

L50S125

Alternate Item Number: L50S125.V

UPC: 079458851250


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Overview

The Littelfuse L50S125 High-Speed Fuse, part of the esteemed L50S Series, represents a pinnacle in modern circuit protection technology. Engineered by Littelfuse, a globally recognized leader in circuit protection solutions, this fuse is meticulously designed to safeguard today’s sophisticated equipment and complex systems from damaging overcurrents and short circuits. Its development leverages Littelfuse’s proprietary, cutting-edge technology, which has consistently set industry benchmarks for accuracy, unwavering quality, and predictable, reliable performance. At the core of the L50S125's exceptional capabilities lies Littelfuse’s deep commitment to innovation. Their engineers have redefined the landscape of High-Speed Fuse Technology through extensive research in advanced metallurgical, polymer, and materials science. This foundational research is complemented by sophisticated mathematical modeling and rigorous computerized statistical analysis, ensuring that each fuse delivers optimal protection under a wide array of operating conditions. This scientific approach translates directly into enhanced system uptime and reduced risk of costly equipment failure. The L50S125 is specifically engineered for high-speed interruption, a critical requirement in applications where rapid fault clearing is paramount. This characteristic is vital for protecting sensitive electronic components, power supplies, and control systems that are susceptible to even brief overcurrent events. The fuse's design prioritizes fast-acting response, minimizing the duration and magnitude of fault currents, thereby preserving the integrity of the protected circuitry. Key benefits and features of the Littelfuse L50S125 High-Speed Fuse include: * **Advanced Protection Technology:** Utilizes Littelfuse-developed metallurgical, polymer, and materials research for superior performance. * **High-Speed Interruption:** Designed for rapid fault clearing, crucial for sensitive electronics. * **Exceptional Accuracy and Reliability:** Ensures consistent and predictable performance, minimizing nuisance tripping. * **Robust Construction:** Built to withstand demanding industrial environments and operational stresses. * **Broad Application Suitability:** Ideal for a wide range of industrial, commercial, and electronic equipment. This fuse is an indispensable component in numerous industrial sectors, including but not limited to, semiconductor manufacturing equipment, industrial automation, power conversion systems, and telecommunications infrastructure. Its ability to provide precise and reliable protection makes it a preferred choice for engineers and system designers who cannot compromise on the safety and longevity of their critical assets. When selecting a fuse for high-performance applications, the Littelfuse L50S125 offers a compelling combination of advanced technology, proven reliability, and the assurance of a trusted manufacturer. Its predictable performance, backed by extensive research and development, makes it a cornerstone for robust and dependable circuit protection strategies.
  • Littelfuse L50S Series High-Speed Fuse
  • Advanced metallurgical, polymer, and materials research
  • Designed for accuracy, consistent quality, and reliability
  • Predictable performance for critical applications
  • Engineered to protect today’s equipment and systems

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Series
L50S
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
L50S Series
Type
Semiconductor Fuse
Package Weight (Imperial)
0.388 L
Package Weight (Metric)
176.400 g
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.