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Littelfuse LA70Q70-4 - VERY FAST-ACTI SEMICOND FUSE Q70-4. Littelfuse LA70Q semiconductor protection fuses feature a 500 volt AC/DC rating in a compact size (11/2” x 13/32”). LA70Q also has the lowest I2t of all similar fuses and excellent cycling ability. Applications includeinverters and small equipment requiring extremely fast response to faults, without the need to carry sustained heavy overloads. Features: Lowest I2t of any fuse this size for greater protection. Excellent cycling ability gives advantage in equipment design.

Littelfuse LA70Q70-4 VERY FAST-ACTI SEMICOND FUSE Q70-4. Littelfuse LA70Q semiconductor protection fuses…

Alternate Item Number: LA70Q704

UPC: 079458153118


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Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The Littelfuse LA70Q70-4 is a highly specialized semiconductor protection fuse engineered for critical applications demanding rapid and precise fault interruption. As a "very fast-acting" fuse, it is specifically designed to protect sensitive semiconductor devices, such as diodes, SCRs, and IGBTs, from damaging overcurrents and short circuits. Its 500 Volt AC/DC rating makes it versatile for a wide range of power electronics systems operating at moderate voltage levels. One of the standout features of the LA70Q70-4 is its exceptionally low I²t rating. This metric quantifies the amount of energy a fuse can withstand before it blows, and a lower I²t signifies a faster and more sensitive response to fault conditions. This characteristic is paramount in semiconductor protection, as it minimizes the duration and magnitude of fault current, thereby significantly reducing the risk of catastrophic damage to expensive and vital components. The LA70Q70-4 offers the lowest I²t available in its compact size class, providing a superior level of protection compared to other fuses of similar dimensions. Furthermore, the LA70Q70-4 exhibits excellent cycling ability. This means it can withstand repeated, short-duration overcurrents without degrading its performance or blowing prematurely. This attribute is particularly advantageous in applications like inverters, motor drives, and power supplies that experience frequent load fluctuations or transient surges during normal operation. The ability to endure these cycles without nuisance tripping enhances equipment reliability and reduces maintenance requirements. Key specifications and benefits of the Littelfuse LA70Q70-4 include: * **Extremely Fast Acting:** Designed for rapid response to overcurrents, safeguarding sensitive semiconductor devices. * **Low I²t Rating:** Offers the lowest energy let-through in its size category, providing superior protection against damaging fault energy. * **500V AC/DC Rating:** Suitable for a broad spectrum of power electronic applications. * **Compact Size (11/2” x 13/32”):** Ideal for space-constrained designs without compromising protection levels. * **Excellent Cycling Ability:** Withstands repeated transient overcurrents, enhancing operational reliability. This fuse is an ideal choice for applications where space is limited but high-performance protection is essential. Typical use cases include: * **Inverters and Converters:** Protecting the power semiconductor stages in solar inverters, variable frequency drives (VFDs), and DC-DC converters. * **Small Equipment Power Supplies:** Safeguarding the internal components of compact power supplies for industrial automation, telecommunications, and medical devices. * **Motor Control Systems:** Providing fast-acting protection for the power modules in motor controllers. * **General Semiconductor Protection:** Anywhere sensitive semiconductor devices require robust and rapid overcurrent protection. Littelfuse is a globally recognized leader in circuit protection, renowned for its commitment to quality, innovation, and reliability. Their extensive product portfolio and deep application expertise make them a trusted partner for engineers and designers seeking robust and dependable solutions. The LA70Q70-4 exemplifies Littelfuse's dedication to providing advanced protection for the evolving landscape of electronic systems, ensuring operational integrity and extending the lifespan of critical equipment.
  • Very Fast-Acting Semiconductor Protection
  • 500V AC/DC Voltage Rating
  • Lowest I²t in its Size Class for Superior Protection
  • Excellent Cycling Ability for Reliable Operation
  • Compact 11/2” x 13/32” Form Factor

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Series
LA70Q
Size
11/2" x 13/32"
Special Features
Very-Fast Acting
Standard
UL Recognized
Sub Brand
LA Series
Type
Semiconductor Fuse
Voltage Rating
500 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 600VAC 600VDC Class CC 30A 3-Pole Pressure Plate with Reinforced Clip

30323R

Fuse Block 600VAC 600VDC Class CC 30A 3-Pole Pressure Plate with Reinforced Clip
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

What is Littelfuse University (LFU)?

LFU is an award-winning resource offering in-depth training courses and quick references about Littelfuse products, programs, and tools.

Who can I contact for technical questions about fuse and relay products?

You can contact the Littelfuse Techline experts via phone at +1-800-TEC-FUSE or email at [email protected].

What information can I access on LittelfuseBusinessCenter.com?

On LittelfuseBusinessCenter.com, you can check product availability, pricing, place orders, track orders, and manage special pricing agreements.

What types of fuses does Littelfuse offer for industrial applications?

Littelfuse offers UL Class fuses, high-speed fuses, medium voltage fuses, 10 x 38 mm fuses, and solar fuses for industrial applications.

What is the purpose of Littelfuse arc-flash protection relays?

Arc-flash relays detect developing arc-flash incidents and send a trip signal to interrupt power before significant damage occurs.

Where can I find digital marketing assets from Littelfuse?

Digital marketing assets such as sales tools, images, videos, and presentations can be found at Littelfuse.com/webdam.

How can I get technical information and product cross-references?

Technical information and cross-reference tools are available at Littelfuse.com/technical-resources.

What is the RepFiles app for?

RepFiles is a free app for salespeople to access Littelfuse product and sales information on their mobile or tablet.

What are the benefits of the MROplus™ program?

The MROplus™ program helps manufacturing facilities lower costs, increase plant safety, decrease downtime, and reduce inventory.

How does the Stock Check Program benefit distributors?

The Stock Check Program drives new customers from Littelfuse.com to distributors by displaying their inventory levels.

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.