Littelfuse LA70QS60-4 - LA70 VERY FAST-ACTI SEMICOND FUSE QS60-4. 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

LA70QS60-4

Alternate Item Number: LA70QS604

UPC: 079458152661

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Overview

The Littelfuse LA70QS60-4 is a high-performance, very fast-acting semiconductor fuse engineered to provide superior protection for modern solid-state power electronic equipment. Designed with the demanding requirements of today's advanced systems in mind, this fuse offers a critical layer of defense against overcurrent and short-circuit events, safeguarding sensitive components and ensuring operational continuity. At its core, the LA70QS60-4 delivers exceptional protection through its significantly lower I²t rating. This metric is crucial for semiconductor protection as it quantifies the energy let-through during a fault. A lower I²t means less damaging energy reaches the protected equipment, thereby extending its lifespan and reducing the likelihood of catastrophic failure. This makes it an ideal choice for applications where even minimal energy exposure can be detrimental. Furthermore, this Littelfuse fuse excels in applications with high cycling loads. Its superior cycling ability ensures reliable performance over extended periods of frequent power on/off cycles or fluctuating load conditions. This robustness is paramount in industrial settings where equipment operates under dynamic and often unpredictable stress. The extended lifespan and consistent protection offered by the LA70QS60-4 translate directly into reduced maintenance costs and increased uptime for critical machinery. Efficiency is another key advantage. The LA70QS60-4 features lower watts loss compared to conventional fuses. This reduction in power dissipation contributes to cooler operation of the fuse itself and the surrounding equipment. Cooler operating temperatures not only enhance reliability but also allow for more compact equipment designs, as less heat needs to be managed. This is particularly beneficial in space-constrained industrial enclosures and high-density power systems. With a versatile 700 Volt AC/DC rating, the LA70QS60-4 provides greater design flexibility for engineers working with a wide range of power systems. This broad voltage compatibility simplifies component selection and system design, accommodating various voltage configurations without compromising safety or performance. The compact size of the LA70QS series fuses further enables downsizing of equipment, allowing manufacturers to create more efficient and cost-effective solutions. Key applications for the Littelfuse LA70QS60-4 include the protection of 700 volt or less solid-state equipment. This encompasses a broad spectrum of industrial power electronics such as: * Motor Drives and Variable Frequency Drives (VFDs) * Uninterruptible Power Supplies (UPS) systems * Inverters and Converters * DC Power Supplies * Power Factor Correction circuits * Renewable energy systems (e.g., solar inverters) When selecting semiconductor fuses, engineers prioritize factors like voltage rating, current rating, interrupting rating, and the critical I²t value. The Littelfuse LA70QS60-4 stands out by offering an optimized balance of these parameters, specifically tailored for the protection of sensitive semiconductor devices. Littelfuse, a globally recognized leader in circuit protection, brings its extensive expertise and commitment to quality to the LA70QS series, ensuring that users receive a reliable and high-performing solution for their most critical applications. Trust in Littelfuse for advanced semiconductor protection that meets and exceeds the challenges of modern industrial power electronics.
  • Very low I²t for improved protection of sensitive semiconductor equipment.
  • Superior cycling ability for long, reliable life in high-cycling loading applications.
  • Lower watts loss for cooler operation and increased equipment efficiency.
  • 700 Volt AC/DC rating provides broad design versatility.
  • Compact sizes enable equipment downsizing and space optimization.

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Series
LA70QS
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
700 V AC/DC
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.