Littelfuse L50QS325 - POWR-SPEED ROUND-BODY 2ND GEN SEMICONDUCTOR FUSE
Littelfuse

L50QS325

UPC: 079458860115

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Specification Sheet

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Overview

The **Littelfuse POWR-SPEED ROUND-BODY 2ND GENERATION SEMICONDUCTOR FUSE (L50QS325)** delivers unmatched reliability and precision for critical circuit protection in high-power industrial and semiconductor applications. Engineered as part of Littelfuse’s industry-leading POWR-SPEED series, this second-generation fuse combines advanced current-limiting technology with a robust round-body design to provide fast-acting, ultra-efficient overcurrent protection. Whether deployed in power electronics, inverters, motor drives, or renewable energy systems, the L50QS325 ensures optimal performance while safeguarding sensitive electronic components from damaging fault conditions. At the core of its design is Littelfuse’s proprietary semiconductor-grade fuse element, which reacts instantaneously to overcurrent events—often within microseconds—to isolate faults before they escalate. This rapid response is critical in applications where even brief overcurrent conditions can lead to catastrophic equipment failure, data corruption, or safety hazards. The fuse’s **current-limiting capability** further enhances protection by restricting the let-through energy during a fault, reducing stress on downstream components and extending system lifespan. The **round-body construction** of the L50QS325 enhances durability and simplifies installation in tight or vibration-prone environments, a common challenge in industrial settings. Its compact form factor allows for easy integration into control panels, power distribution units, and custom enclosures without sacrificing performance. Additionally, the fuse’s **high interrupting rating** ensures reliable operation even in high-fault-current scenarios, making it suitable for demanding applications such as: - **Power electronics** (inverters, converters, and rectifiers) - **Semiconductor manufacturing equipment** (wafer processing, test systems) - **Motor drives and variable frequency drives (VFDs)** - **Renewable energy systems** (solar inverters, wind power converters) - **Industrial automation and robotics** - **Data centers and critical infrastructure** Professionals in electrical engineering, maintenance, and system design rely on Littelfuse for its **proven track record** in circuit protection solutions. With decades of expertise in fuse technology, Littelfuse has established itself as a trusted partner for industries where reliability is non-negotiable. The L50QS325 is no exception—it undergoes rigorous testing to meet international standards, including UL, IEC, and CSA certifications, ensuring compliance with global safety and performance requirements. Installation and maintenance are streamlined thanks to the fuse’s **user-friendly design**. The round-body shape allows for secure mounting in fuse holders or clips, reducing the risk of misalignment or improper seating. For applications requiring frequent fuse replacement, Littelfuse offers compatible fuse holders and accessories to simplify servicing. When paired with Littelfuse’s **POWR-SPEED series accessories**, such as indicator modules or alarm switches, the L50QS325 becomes part of a comprehensive protection strategy that enhances system visibility and uptime. Choosing the right semiconductor fuse involves balancing **speed, interrupting rating, and physical dimensions** with the specific demands of the application. The L50QS325 excels in scenarios where **fast-acting protection** is paramount, such as protecting IGBTs, MOSFETs, or thyristors in high-frequency switching circuits. Its **low let-through energy (I²t)** minimizes thermal and mechanical stress on protected components, a critical factor in prolonging the life of expensive semiconductor devices. For engineers and procurement specialists, Littelfuse provides **technical support, application guidance, and customization options** to ensure the L50QS325 integrates seamlessly into any project. Whether you’re designing a new system or upgrading an existing one, the L50QS325 offers a **cost-effective, high-performance solution** that reduces downtime, prevents costly failures, and enhances overall system safety. Trust Littelfuse to deliver the protection your industrial applications demand—where precision, durability, and reliability are paramount.
  • Second-generation semiconductor-grade fuse with fast-acting current-limiting protection
  • Round-body design for durability and easy installation in tight spaces
  • High interrupting rating for reliable operation in high-fault-current scenarios
  • Ideal for power electronics, inverters, motor drives, and renewable energy systems
  • UL, IEC, and CSA certified for global compliance and safety

Specifications

Mounting Type
Round-body
Series
POWR-SPEED ROUND-BODY 2ND GEN
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.