Littelfuse LA15QS55-1 - The Littelfuse LA15QS series semiconductor fuses were designed for the specific protection of diodes and other semiconductor devices rated 150VAC/DC. The LA15QS product lines compact design is perfect for those applications that have limitations on available space.
Littelfuse

LA15QS55-1

Alternate Item Number: LA15QS551

UPC: 079458155877


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Overview

The **Littelfuse LA15QS55-1** semiconductor fuse is a high-performance, compact solution engineered for the precise protection of diodes and other critical semiconductor devices operating at **150VAC/DC**. Designed to meet the demands of modern industrial and electronic systems, this fuse combines reliability, durability, and space-saving efficiency—making it an ideal choice for applications where available space is limited. Whether deployed in power conversion systems, motor drives, or renewable energy inverters, the LA15QS55-1 ensures robust overcurrent protection without compromising on performance or safety. **Key Features and Benefits:** - **Compact Design for Space-Constrained Applications:** The LA15QS55-1’s streamlined form factor allows for easy integration into tight enclosures, control panels, and compact electrical assemblies. This makes it particularly well-suited for applications such as: - **Power Supplies:** Protecting high-speed switching power supplies in industrial automation, telecommunications, and data centers. - **Motor Drives and Inverters:** Safeguarding IGBTs, MOSFETs, and other semiconductor devices in variable frequency drives (VFDs) and solar inverters. - **Renewable Energy Systems:** Providing reliable overcurrent protection in wind turbine converters, battery management systems, and grid-tied inverters. - **Medical Equipment:** Ensuring patient safety in high-reliability medical devices where space and precision are critical. - **Superior Semiconductor Protection:** Engineered specifically for semiconductor devices, the LA15QS55-1 offers fast-acting response times to mitigate the risk of thermal runaway, short circuits, or transient overvoltages. Its design minimizes let-through energy, reducing stress on protected components and extending system lifespan. - **Versatile Voltage Rating:** With a **150VAC/DC** rating, this fuse supports a wide range of applications, from low-voltage industrial controls to high-performance power electronics. It is compatible with both alternating and direct current systems, offering flexibility for global installations. - **Durability and Reliability:** Littelfuse is a trusted name in circuit protection, known for its rigorous testing and adherence to international standards. The LA15QS55-1 is manufactured to meet or exceed UL, IEC, and other regulatory requirements, ensuring consistent performance in harsh environments. - **Easy Installation and Maintenance:** The fuse’s standardized dimensions and terminal configurations simplify integration into existing systems. Its robust construction resists vibration, shock, and thermal cycling, reducing downtime and maintenance costs. **Why Choose Littelfuse for Semiconductor Protection?** Littelfuse has been a leader in circuit protection solutions for over a century, serving industries such as automotive, aerospace, industrial automation, and renewable energy. The LA15QS series, including the LA15QS55-1, reflects the company’s commitment to innovation and precision engineering. Professionals rely on Littelfuse fuses for their ability to: - **Prevent Catastrophic Failures:** By interrupting fault currents before they damage sensitive semiconductor components. - **Enhance System Efficiency:** Through low power dissipation and minimal voltage drop during normal operation. - **Support Compliance:** With certifications that align with global safety and performance standards. **Selecting the Right Fuse for Your Application:** When choosing a semiconductor fuse like the LA15QS55-1, consider the following factors: - **Current Rating:** Ensure the fuse’s rating matches or slightly exceeds the maximum continuous current of your system. - **Voltage Rating:** Verify compatibility with your system’s operating voltage (AC or DC). - **Response Time:** Fast-acting fuses like the LA15QS55-1 are ideal for protecting sensitive semiconductors from transient events. - **Environmental Conditions:** Assess temperature, humidity, and vibration requirements to ensure long-term reliability. **Installation Best Practices:** Proper installation is critical to maximizing the performance and lifespan of the LA15QS55-1. Follow these guidelines: - **Mounting:** Secure the fuse in a well-ventilated location to prevent overheating. Use appropriate hardware to avoid mechanical stress. - **Wiring:** Ensure tight, corrosion-free connections to minimize contact resistance and voltage drop. - **Clearance:** Maintain adequate clearance around the fuse to allow for heat dissipation and safe operation. - **Testing:** Perform regular inspections and functional tests to verify the fuse’s integrity and system protection. For engineers, technicians, and procurement professionals seeking a dependable, space-efficient solution for semiconductor protection, the **Littelfuse LA15QS55-1** delivers unmatched performance and peace of mind. Trusted by industry leaders worldwide, Littelfuse fuses are the go-to choice for critical applications where reliability cannot be compromised.
  • Compact design for space-constrained applications
  • 150VAC/DC rating for versatile use
  • Fast-acting protection for diodes and semiconductors
  • UL/IEC certified for global compliance
  • Easy installation with standardized dimensions

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 Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in
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.

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.