Littelfuse LA70QS50-22F - 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

LA70QS50-22F

Alternate Item Number: LA70QS5022F

UPC: 079458152593

Documents & Media
Brochure

Contact for Pricing

Overview

The **Littelfuse LA70QS50-22F** is a premium **French Cylindrical Semiconductor Fuse** engineered for demanding industrial environments where reliability and precision are critical. Part of the esteemed **LA70QS series**, this fuse combines a **solid-fill design** with **high interrupting ratings**, ensuring robust protection for sensitive semiconductor circuits against overcurrent conditions. Designed to meet the rigorous demands of modern power electronics, industrial automation, and renewable energy systems, the LA70QS50-22F delivers unmatched performance and operational safety. This fuse is available in the **22 x 58mm** international standard size, making it a globally compatible solution for engineers and technicians worldwide. Its **solid-fill construction** enhances thermal stability and arc suppression, reducing the risk of catastrophic failure during fault conditions. For enhanced monitoring and maintenance, the **optional striker feature** provides **visual or remote blown fuse indication**, enabling proactive system diagnostics and minimizing downtime in critical applications. **Key Features of the Littelfuse LA70QS50-22F:** - **High Interrupting Ratings:** Engineered to handle extreme fault currents, ensuring superior circuit protection in high-power applications. - **Solid-Fill Design:** Optimized for thermal management and arc quenching, enhancing reliability in semiconductor protection. - **Optional Striker Mechanism:** Facilitates **visual or remote indication** of blown fuses, improving maintenance efficiency and system uptime. - **International Compliance:** Meets **14 x 51mm and 22 x 58mm** cylindrical fuse standards, ensuring broad compatibility across global markets. - **Durable Construction:** Built for harsh industrial environments, with robust materials that withstand vibration, temperature fluctuations, and electrical stress. **Typical Applications:** The **Littelfuse LA70QS50-22F** is ideal for a wide range of high-performance applications, including: - **Power Electronics:** Inverters, converters, and motor drives where precise overcurrent protection is essential. - **Industrial Automation:** PLCs, robotics, and control systems requiring reliable fault interruption. - **Renewable Energy Systems:** Solar inverters, wind turbine converters, and battery management systems. - **Semiconductor Manufacturing:** Protection of sensitive ICs and power modules in fabrication facilities. - **Transportation & Heavy Machinery:** Traction systems, elevators, and industrial vehicles where safety and durability are paramount. **Why Choose Littelfuse?** With over **100 years of innovation** in circuit protection, Littelfuse is a trusted name in industrial safety solutions. The **LA70QS series** is a testament to the company’s commitment to **engineering excellence**, offering fuses that meet the highest standards of performance and reliability. Professionals worldwide rely on Littelfuse for products that **minimize downtime, reduce maintenance costs, and protect critical infrastructure**. **Installation & Selection Considerations:** When selecting the **LA70QS50-22F**, engineers should evaluate: - **Interrupting Rating:** Ensure compatibility with the system’s prospective fault current. - **Striker Option:** Determine if visual or remote indication is required for the application. - **Environmental Conditions:** Verify the fuse’s suitability for the operating temperature and vibration levels. - **Compliance Standards:** Confirm adherence to local and international regulations (e.g., IEC, UL). For seamless integration into existing systems, the **LA70QS50-22F** is designed to fit standard **French cylindrical fuse holders**, simplifying retrofits and new installations. Its **high interrupting ratings** and **solid-fill design** make it a preferred choice for applications where **fail-safe operation** is non-negotiable. **Invest in Protection, Invest in Performance** The **Littelfuse LA70QS50-22F** is more than just a fuse—it’s a **critical safeguard** for your most valuable electronic assets. Whether you’re designing a new power system or upgrading an existing one, this fuse provides the **reliability, durability, and precision** needed to operate with confidence. Trust Littelfuse to deliver **industry-leading circuit protection** that keeps your systems running smoothly, even in the most challenging conditions.
  • High interrupting ratings for superior overcurrent protection
  • Solid-fill design enhances thermal stability and arc suppression
  • Optional striker provides visual or remote blown fuse indication
  • 22 x 58mm size meets international cylindrical fuse standards
  • Ideal for power electronics, industrial automation, and renewable energy systems

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
50 A
Material
Solid-fill
Material
Solid-fill construction
Series
LA70QS
Size
22 x 58 mm
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.