Littelfuse L50S250 - 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

L50S250

Alternate Item Number: L50S250.V

UPC: 079458852509

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Overview

The **Littelfuse L50S250 High-Speed Fuse** from the **L50S Series** represents the pinnacle of overcurrent protection for modern industrial and electronic systems. Designed to meet the rigorous demands of today’s high-performance applications, this fuse combines Littelfuse’s proprietary metallurgical, polymer, and materials research with advanced mathematical modeling and computerized statistical analysis to deliver unmatched accuracy, reliability, and predictable performance. Unlike conventional fuses, the L50S250 is engineered for high-speed response, ensuring rapid interruption of fault currents to safeguard sensitive electronics, power conversion systems, and critical industrial machinery from catastrophic damage. High-speed fuses like the L50S250 are essential in applications where even millisecond delays in fault detection can result in equipment failure, data loss, or safety hazards. The L50S Series, including the L50S250, is widely adopted in industries such as **renewable energy (solar inverters, wind power converters), semiconductor manufacturing, motor drives, and electric vehicle charging infrastructure**. Its ability to handle high fault currents while maintaining tight tolerances makes it ideal for protecting IGBTs, thyristors, and other high-speed switching devices in power electronics. Key advantages of the Littelfuse L50S250 include: - **Superior accuracy and consistency**: Engineered with advanced metallurgical techniques, the fuse ensures minimal deviation in response time, providing reliable protection across varying load conditions. - **Predictable performance under stress**: Computerized statistical analysis guarantees consistent behavior, reducing the risk of nuisance tripping or inadequate protection in critical systems. - **Advanced materials for durability**: Utilizing cutting-edge polymer and metallurgical research, the fuse withstands thermal and mechanical stresses, extending operational lifespan even in harsh environments. - **Compliance with industry standards**: The L50S Series meets stringent international certifications, including UL, IEC, and CE, ensuring seamless integration into global power distribution networks. - **Engineered for high-speed applications**: With a response time optimized for fast-acting protection, the L50S250 is the preferred choice for engineers designing systems where downtime is unacceptable. Professionals in power electronics, industrial automation, and renewable energy sectors rely on Littelfuse’s reputation for innovation and quality when selecting protective components. The company’s decades of expertise in fuse technology—coupled with its commitment to research and development—position the L50S250 as a trusted solution for mission-critical applications. Installation is straightforward, with the fuse designed to fit standard high-speed fuse holders, ensuring compatibility with existing infrastructure while minimizing downtime during replacement. For engineers and technicians seeking a high-speed fuse that delivers **precision, reliability, and longevity**, the Littelfuse L50S250 is the optimal choice. Its advanced technology not only protects valuable equipment but also enhances system efficiency by preventing unnecessary shutdowns and reducing maintenance costs. Whether deployed in a solar farm, a semiconductor fabrication plant, or an electric vehicle charging station, the L50S250 ensures that power systems operate safely and efficiently under all conditions.
  • High-speed response for critical overcurrent protection
  • Advanced metallurgical and polymer technology for durability
  • Predictable performance with minimal deviation in response time
  • Compliant with UL, IEC, and CE international standards
  • Ideal for renewable energy, power electronics, and industrial systems

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
L50S Series
Type
Semiconductor Fuse
Package Weight (Imperial)
0.617 L
Package Weight (Metric)
280.600 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.