Littelfuse LA70Q450-4 - VERY FAST-ACTI SEMICOND FUSE Q450-4. 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

LA70Q450-4

Alternate Item Number: LA70Q4504

UPC: 079458153231

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Overview

The Littelfuse LA70Q450-4 is a high-performance, very fast-acting semiconductor protection fuse engineered to deliver exceptional reliability and safety in demanding industrial applications. Designed with a robust 500V AC/DC rating and presented in a compact 1.5” x 13/32” (0.406”) form factor, this fuse is an ideal choice for protecting sensitive electronic components in inverters, power supplies, and other critical equipment where rapid fault response is paramount. At the core of the LA70Q450-4's superior performance is its exceptionally low I²t rating. This specification is crucial for semiconductor protection, as it quantifies the amount of energy a fuse can withstand before blowing. A lower I²t means the fuse reacts faster to overcurrent events, providing a higher level of protection for delicate semiconductor devices that are susceptible to damage from even brief surges. This characteristic makes the LA70Q450-4 particularly well-suited for applications that experience frequent, short-duration fault conditions. Furthermore, the LA70Q450-4 boasts excellent cycling ability. This feature is vital in applications where equipment undergoes repeated power cycles or experiences transient overloads that are not indicative of a permanent fault. The fuse's resilience to these operational stresses ensures longevity and reduces the likelihood of nuisance tripping, thereby enhancing equipment uptime and operational efficiency. This advanced cycling capability simplifies equipment design by allowing engineers to optimize for performance without compromising protection against genuine faults. Key features and benefits of the Littelfuse LA70Q450-4 include: * **Unparalleled Protection:** Offers the lowest I²t of any fuse in its size class, providing superior defense against damaging fault currents for sensitive semiconductor devices. * **High Voltage Capability:** Rated for 500V AC/DC, ensuring suitability for a wide range of power electronics systems. * **Compact Design:** The 1.5” x 13/32” dimensions allow for space-saving integration into densely populated equipment. * **Exceptional Cycling Performance:** Designed to withstand repeated operational cycles and transient overloads, minimizing nuisance tripping and maximizing reliability. * **Fast Response Time:** Extremely fast-acting characteristics ensure rapid interruption of fault currents, preventing catastrophic damage to protected components. Applications for the Littelfuse LA70Q450-4 are diverse and include: * **Inverters:** Protecting the power semiconductor devices within solar inverters, variable frequency drives (VFDs), and uninterruptible power supplies (UPS). * **Power Supplies:** Safeguarding components in high-efficiency AC/DC and DC/DC power converters. * **Small Equipment:** Providing essential protection in various types of industrial automation, control systems, and specialized electronic devices. * **Motor Drives:** Ensuring the integrity of semiconductor components in motor control applications. Littelfuse is a globally recognized leader in circuit protection, known for its commitment to quality, innovation, and reliability. The LA70Q450-4 exemplifies this dedication, offering engineers and technicians a trusted solution for critical protection needs. When selecting fuses for semiconductor applications, prioritizing fast-acting characteristics, low I²t, and robust cycling ability is essential for long-term system integrity and performance. The LA70Q450-4 from Littelfuse delivers on all these fronts, making it a premier choice for safeguarding your valuable electronic assets.
  • Very Fast-Acting Semiconductor Protection Fuse
  • 500V AC/DC Voltage Rating
  • Lowest I²t in its Size Class for Superior Protection
  • Excellent Cycling Ability for Enhanced Reliability
  • Compact 1.5" x 13/32" (0.406") Form Factor

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 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
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.