Littelfuse PSR073FL0350 - Littelfuse PSR Series High-Speed Square Body Fuses are specially designed for protection of power semiconductor devices such as diodes, triacs, IGBTs, SCRs, MOSFETs and other solid state devices that are typically designed into power conversion and power conditioning equipment. Variable frequency drives, inverters, UPS, rectifiers and soft-starters are examples of typical equipment designed with sensitive power semiconductor devices that cannot withstand any line surge or overcurrent conditions and require high-speed protection. Littelfuse POWR-SPEED® PSR Series products offer optimized circuit protection at the extremely fast speed required to protect modern day power conversion devices. Such products are commonly found in numerous applications including pulp and paper industries, cranes and heavy-lifting equipment, processing industries, wastewater treatment plants and various large factories and MRO facilities.
Littelfuse

PSR073FL0350

Alternate Item Number: PSR073FL0350Z

UPC: 079458205916


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Overview

The Littelfuse PSR073FL0350, a critical component from the esteemed PSR Series, is engineered to deliver ultra-fast circuit protection specifically for sensitive power semiconductor devices. This high-speed square body fuse is indispensable in modern industrial power conversion and conditioning equipment, where the integrity of components like diodes, triacs, IGBTs, SCRs, and MOSFETs is paramount. Modern power electronics demand protection that can react instantaneously to transient surges and overcurrent events, and the PSR Series is designed to meet this exacting requirement. This 350 Amp fuse, identified by its SKU PSR073FL0350, provides an optimized solution for safeguarding sophisticated electronic systems. Typical applications where this level of protection is vital include variable frequency drives (VFDs) used to control motor speeds in manufacturing, inverters essential for renewable energy systems and uninterruptible power supplies (UPS) ensuring continuous operation of critical infrastructure, rectifiers converting AC to DC power, and soft-starters that gradually bring large motors online to prevent mechanical stress and electrical surges. The ability of the Littelfuse PSR073FL0350 to interrupt fault currents at extremely high speeds minimizes the potential for catastrophic damage to these expensive and vital semiconductor components, thereby reducing downtime and maintenance costs. The robust construction and specialized design of the Littelfuse PSR Series fuses make them ideal for harsh industrial environments. They are commonly deployed across a wide spectrum of industries, including: * **Pulp and Paper Mills:** Ensuring reliable operation of heavy machinery and process control systems. * **Cranes and Heavy-Lifting Equipment:** Protecting the sophisticated motor control and power electronics that drive these essential industrial tools. * **Processing Industries:** Safeguarding the complex power systems in chemical plants, food processing facilities, and other manufacturing operations. * **Wastewater Treatment Plants:** Providing reliable protection for the pumps, motors, and control systems that are critical for public health and environmental management. * **Large Factories and MRO Facilities:** Supporting the diverse power needs of general manufacturing, maintenance, repair, and operations. By selecting the Littelfuse PSR073FL0350, engineers and maintenance professionals can be confident in the superior protection offered by a manufacturer renowned for its commitment to quality and innovation in circuit protection. This fuse represents a crucial investment in the longevity and operational efficiency of high-value industrial power systems, ensuring that sensitive semiconductor devices are shielded from damaging electrical anomalies with unparalleled speed and reliability. The '073' size designation and 350A current rating are key specifications that allow for precise integration into existing or new system designs, ensuring compatibility and optimal performance.
  • Ultra-fast acting protection for sensitive power semiconductor devices
  • Specifically designed for diodes, triacs, IGBTs, SCRs, and MOSFETs
  • Ideal for power conversion and conditioning equipment like VFDs, UPS, and inverters
  • Robust square body design for industrial applications
  • 350A current rating with '073' size for precise system integration

Specifications

Amperage Rating
350 Amp
Application
Power conversion devices
Brand Name
Littelfuse
Current Rating
350 A
Interrupt Rating
100kA@1300VAC
Response Time
Very Fast-Acting (FF)
Series
PSR
Size
73
Special Features
Flush End
Sub Brand
POWR-SPEED® PSR Series
Type
Square Body Fuse
Voltage Rating
1250/1000 VAC/VDC
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.