Littelfuse LA70QS50-22FI - Littelfuse French Cylindrical style semiconductor fuses are an extension to the LA70QS series. They offer a solid-fill design with high interrupting ratings and an optional striker for visual or remote blown fuse indication. The international 14 x 51mm and 22 x 58mm sizes are accepted worldwide.
Littelfuse

LA70QS50-22FI

Alternate Item Number: LA70QS5022FI

UPC: 079458152968


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Overview

The Littelfuse LA70QS50-22FI represents a significant advancement in semiconductor fuse technology, specifically engineered for robust protection in demanding industrial environments. As a key component within the esteemed LA70QS series, this French cylindrical style fuse is designed to safeguard sensitive semiconductor devices from damaging overcurrent and short-circuit events. Its advanced solid-fill design is a critical feature, contributing to enhanced reliability and superior performance under extreme conditions. This construction method ensures that the fuse element remains stable and protected, even during high-energy fault situations, thereby preventing catastrophic failures and minimizing downtime. With exceptionally high interrupting ratings, the LA70QS50-22FI offers a superior level of protection, capable of safely dissipating the immense energy associated with severe electrical faults. This makes it an ideal choice for applications involving high-power semiconductor devices such as rectifiers, thyristors, and IGBTs, commonly found in motor drives, power supplies, and industrial automation systems. The fuse's ability to interrupt fault currents quickly and effectively is paramount to preserving the integrity of expensive power electronic components and ensuring the overall safety and stability of the electrical system. A standout feature of the LA70QS50-22FI is the availability of an optional striker mechanism. This integrated component provides either visual or remote blown fuse indication, a crucial benefit for operational efficiency and maintenance. Visual indication allows for immediate identification of a tripped fuse, while the remote indication capability can be integrated into control systems for automated alerts and diagnostics. This proactive notification system helps maintenance teams respond swiftly to issues, reducing diagnostic time and preventing potential cascading failures. Designed to meet global standards, the LA70QS50-22FI adheres to the widely accepted international 14 x 51mm and 22 x 58mm fuse dimensions. This universal sizing ensures compatibility with a vast array of existing fuse holders and equipment worldwide, simplifying integration and replacement processes for engineers and technicians across different regions and industries. Littelfuse's commitment to quality and innovation is evident in this product, offering a dependable solution for critical circuit protection needs. Key benefits and features include: * **High Interrupting Ratings:** Ensures safe and reliable interruption of severe fault currents, protecting valuable semiconductor components. * **Solid-Fill Design:** Enhances fuse integrity and performance under high fault energy conditions. * **Optional Striker Mechanism:** Provides essential visual or remote blown fuse indication for efficient maintenance and operational monitoring. * **International Standards Compliance:** Utilizes 14 x 51mm and 22 x 58mm dimensions for global compatibility and ease of integration. * **Semiconductor Protection:** Specifically engineered for the sensitive protection requirements of power electronic devices. Industries that benefit from the Littelfuse LA70QS50-22FI include renewable energy (solar inverters, wind turbines), industrial motor control, power conversion systems, electric vehicle charging infrastructure, and heavy-duty power supplies. By choosing Littelfuse, you are investing in a legacy of trusted circuit protection, backed by extensive engineering expertise and a commitment to delivering reliable, high-performance solutions for the most challenging applications. The LA70QS50-22FI is more than just a fuse; it's a critical element in ensuring the longevity and operational integrity of your vital industrial equipment.
  • French cylindrical style semiconductor fuse (22x58mm)
  • Solid-fill design for enhanced reliability and performance
  • High interrupting ratings for superior overcurrent protection
  • Optional striker for visual or remote blown fuse indication
  • Globally accepted international 14x51mm and 22x58mm sizes

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
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.