Littelfuse LA15QS40-1 - 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

LA15QS40-1

Alternate Item Number: LA15QS401

UPC: 079458155822


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Overview

The **Littelfuse LA15QS40-1** semiconductor fuse is a high-performance, space-saving solution engineered for precise protection of diodes and other sensitive semiconductor devices operating at 150VAC/DC. Designed for engineers and system integrators working in constrained environments, this fuse combines compact dimensions with robust performance to meet the demands of modern industrial and electronic systems. Whether deployed in power supplies, motor controls, inverters, or renewable energy systems, the LA15QS40-1 delivers uncompromising reliability and safety, ensuring long-term operational integrity even in harsh operating conditions. Semiconductor protection is critical in applications where transient overcurrents or fault conditions could lead to catastrophic failure. The **LA15QS series** from Littelfuse addresses this need with a specialized design optimized for semiconductor devices, offering fast-acting response times to isolate faults before they escalate. Unlike general-purpose fuses, which may lack the precision required for sensitive components, the LA15QS40-1 is purpose-built to safeguard high-value electronics, including IGBTs, MOSFETs, thyristors, and rectifier diodes. Its **150VAC/DC rating** makes it particularly well-suited for industrial automation, variable frequency drives (VFDs), and DC power distribution systems where voltage stability and fault protection are paramount. One of the standout features of the LA15QS40-1 is its **compact form factor**, which allows for seamless integration into space-constrained designs without sacrificing performance. This makes it an ideal choice for applications such as: - **Power supplies** (SMPS, UPS systems) - **Motor drives and controls** (servo motors, industrial robots) - **Renewable energy systems** (solar inverters, wind turbine converters) - **Telecommunications equipment** (base stations, data centers) - **Medical devices** (imaging systems, surgical tools) Professionals in these industries rely on Littelfuse’s reputation for quality and innovation, a legacy built over decades of serving the most demanding sectors. The LA15QS40-1 is manufactured to meet stringent international standards, including UL, IEC, and CSA certifications, ensuring compliance with global safety and performance requirements. Its **high interrupting rating** and **low let-through energy (I²t)** minimize stress on protected components, extending their operational lifespan while reducing maintenance costs. Installation is straightforward, with the fuse designed for compatibility with standard fuse holders and panels. Littelfuse provides comprehensive technical documentation, including datasheets and application notes, to assist engineers in proper sizing and placement. For applications requiring additional protection layers, the LA15QS40-1 can be paired with Littelfuse’s range of surge protection devices (SPDs) and circuit breakers for a holistic safety solution. Choosing the right semiconductor fuse involves balancing **response time, voltage rating, and physical size**—factors that directly impact system reliability. The LA15QS40-1 excels in all three areas, making it a trusted component in mission-critical applications where downtime is not an option. Whether you’re designing a new system or retrofitting an existing one, this fuse delivers the performance and peace of mind required in today’s high-stakes industrial environments.
  • 150VAC/DC rated for semiconductor device protection
  • Compact design for space-constrained applications
  • Fast-acting response to isolate faults quickly
  • UL, IEC, and CSA certified for global compliance
  • Compatible with standard fuse holders and panels

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.