Authorized Littelfuse Distributor
Littelfuse LA70Q175-4 - VERY FAST-ACTI SEMICOND FUSE Q175-4. 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 LA70Q175-4 VERY FAST-ACTI SEMICOND FUSE Q175-4. Littelfuse LA70Q semiconductor protection fuses…

Alternate Item Number: LA70Q1754

UPC: 079458153170

Documents & Media
Brochure

Contact for Pricing

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

Overview

The **Littelfuse LA70Q175-4** is a **very fast-acting semiconductor protection fuse** designed for critical applications requiring immediate fault interruption. Rated for **500V AC/DC**, this fuse combines a **compact 1.5" x 0.406" (11/2" x 13/32") footprint** with industry-leading performance, making it ideal for space-constrained and high-reliability environments. As part of Littelfuse’s **LA70Q series**, this fuse is optimized for protecting sensitive electronic components in power electronics, inverters, and other high-speed switching devices where rapid fault detection is essential. **Key Features & Technical Advantages:** - **Ultra-Fast-Acting Design**: The LA70Q175-4 provides **exceptionally fast response times**, ensuring immediate fault interruption to protect semiconductor devices from transient overcurrents and short circuits. This is critical in applications where even millisecond delays can lead to component failure or system downtime. - **Lowest I²t in Its Class**: With the **lowest I²t (integrated thermal energy) rating** of any fuse in its size category, this component minimizes energy let-through during fault conditions. This reduces stress on downstream components, extending their operational lifespan and improving overall system reliability. - **Excellent Cycling Ability**: Unlike standard fuses that degrade with repeated overloads, the LA70Q175-4 maintains **consistent performance across multiple fault cycles**. This makes it highly suitable for applications with frequent start-up surges or intermittent fault conditions, such as motor drives, solar inverters, and industrial power supplies. - **500V AC/DC Versatility**: The fuse’s **dual-rated 500V AC/DC capability** ensures compatibility with a wide range of power systems, from industrial machinery to renewable energy installations. This flexibility simplifies inventory management and reduces the need for multiple fuse variants. - **Compact & Space-Efficient Design**: Measuring just **1.5" x 0.406"**, the LA70Q175-4 fits easily into tight enclosures while delivering high-performance protection.
  • 500V AC/DC voltage rating for versatile power system compatibility
  • Ultra-fast-acting design for immediate fault interruption
  • Lowest I²t rating in its class for superior component protection
  • Excellent cycling ability for repeated fault conditions
  • Compact 1.5" x 0.406" size for space-constrained installations

Specifications

Application
Protection of Semiconductors
Brand Name
Littelfuse
Current Rating
175 A
Material
Semiconductor fuse with pure die-cut elements embedded in solidified sand
Series
LA70Q
Size
1.5" x 0.406" (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 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.