Littelfuse LA70QS175-4 - LA70 VERY FAST-ACT SEMICOND FUSE QS175-4. Littelfuse LA70QS semiconductor fuses were developed to provide improved performance required by today’s new equipment. The LA70QS features lower I2t, improved cycling, and lower watts loss. It is the best choice for the protection of dynamic solid-state equipment. Features: Very low I2t improved protection of equipment. Superior cycling ability for long, reliable life on high cycling loading. Lower watts loss for cooler operation. 700 Volt AC/DC rating provides greater design versatility. Compact sizes allow downsizing of equipment. Applications: Protection of 700 volt or less solid state equipment such as motor drives, UPS, inverters, etc.
Littelfuse

LA70QS175-4

Alternate Item Number: LA70QS1754

UPC: 079458152739


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Overview

The Littelfuse LA70QS175-4 is a cutting-edge semiconductor fuse engineered to provide superior protection for dynamic solid-state equipment. Designed by Littelfuse, a globally recognized leader in circuit protection, this fuse (SKU: LA70QS175-4) addresses the evolving performance demands of modern industrial applications. Its very fast-acting characteristics are crucial for safeguarding sensitive electronic components from damaging overcurrents and short circuits, ensuring operational continuity and extending equipment lifespan. Key to the LA70QS175-4's performance is its exceptionally low I²t rating. This specification quantifies the energy a fuse can withstand before it blows, and a lower I²t value signifies faster and more precise interruption of fault currents. This enhanced protection is paramount for expensive solid-state devices such as motor drives, uninterruptible power supplies (UPS), and inverters, where even brief overloads can lead to catastrophic failure. The fuse's superior cycling ability further enhances its reliability in applications with frequent load fluctuations, a common scenario in variable speed drives and power conversion systems. This resilience translates to longer service life and reduced maintenance requirements. Beyond its protective capabilities, the LA70QS175-4 also contributes to system efficiency and design flexibility. Its lower watts loss means less energy is dissipated as heat during normal operation, leading to cooler equipment temperatures and potentially smaller heatsink requirements. This not only improves energy efficiency but also allows for more compact equipment designs, a significant advantage in space-constrained industrial environments. The 700 Volt AC/DC rating offers broad applicability across a wide range of voltage levels commonly found in industrial power systems, providing engineers with greater design versatility and simplifying component selection. Applications for the Littelfuse LA70QS175-4 are extensive and include the critical protection of 700-volt or less solid-state equipment. This encompasses: * **Motor Drives:** Safeguarding variable frequency drives (VFDs) and other motor control systems from electrical faults. * **Uninterruptible Power Supplies (UPS):** Ensuring continuous power delivery by protecting the sensitive power electronics within UPS systems. * **Inverters:** Providing robust protection for the power conversion stages in solar inverters, grid-tied inverters, and other power electronics. * **DC Power Supplies:** Protecting high-power DC power supplies used in various industrial processes. * **Power Converters:** Shielding a wide array of power conversion equipment from transient overcurrents. When selecting semiconductor fuses, engineers prioritize factors like voltage rating, current rating, interrupting rating, and time-current characteristics. The LA70QS175-4 excels in providing a balanced combination of these critical parameters, making it an ideal choice for demanding applications. Littelfuse's commitment to quality and innovation ensures that products like the LA70QS175-4 meet stringent industry standards and deliver reliable performance in the most challenging environments. Its compact form factor further aids in system integration and overall equipment miniaturization.
  • Very low I²t for enhanced protection of sensitive solid-state equipment.
  • Superior cycling ability ensures long, reliable life in high-cycling load applications.
  • Lower watts loss promotes cooler operation and potential equipment downsizing.
  • 700 Volt AC/DC rating offers broad design versatility for various industrial systems.
  • Compact size facilitates equipment miniaturization and integration.

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
175 A
Series
LA70QS
Size
Compact
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
700 V AC/DC
Package Dimensions (L x W x H)
2 IN x 0.81 IN x 0.81 IN
Package Dimensions (L x W x H)
5.08 cm x 20.574 mm x 20.574 mm
Package Weight (Imperial)
0.200 L
Package Weight (Metric)
0.091 kg
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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.