Littelfuse PSR032FL0900 - 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

PSR032FL0900

Alternate Item Number: PSR032FL0900Z

UPC: 079458204957

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Overview

The **Littelfuse PSR032FL0900 High-Speed Square Body Fuse** from the renowned **POWR-SPEED® PSR Series** delivers unmatched protection for sensitive power semiconductor devices in demanding industrial applications. Engineered to safeguard critical components such as **diodes, triacs, IGBTs, SCRs, MOSFETs**, and other solid-state devices, this fuse is a cornerstone of modern power conversion and conditioning systems. Unlike conventional fuses, the PSR Series is specifically designed to respond at **ultra-fast speeds**, ensuring that even the most transient overcurrent or line surge conditions are mitigated before they can damage expensive electronics. This makes it an essential component in equipment where reliability and precision are non-negotiable. The **PSR032FL0900** is optimized for use in **power conversion and conditioning equipment**, including **variable frequency drives (VFDs), inverters, UPS systems, rectifiers, and soft-starters**. These systems are foundational in industries where operational continuity and equipment longevity are critical, such as **pulp and paper manufacturing, heavy-lifting cranes, processing plants, wastewater treatment facilities, and large-scale factories**. In these environments, power semiconductors are subjected to frequent switching transients, harmonics, and other electrical stresses that can lead to catastrophic failures if not properly managed. The **PSR Series** addresses this challenge by providing **high-speed interruption** that prevents thermal runaway and component degradation, thereby extending the lifespan of both the fuse and the protected equipment. Selecting the right high-speed fuse for power semiconductor protection requires careful consideration of **interrupting rating, speed of response, and thermal characteristics**. The **PSR032FL0900** excels in all these areas, offering a **square body design** that ensures consistent performance and easy installation in panelboards, motor control centers, and other industrial enclosures. Its **compact footprint** allows for efficient space utilization, while its **robust construction** ensures durability in harsh operating conditions, including high temperatures, vibrations, and corrosive atmospheres. Professionals in the field trust Littelfuse for its **decades of expertise in circuit protection**, with the PSR Series representing the gold standard for protecting high-value power electronics. Installation of the **PSR032FL0900** is straightforward, thanks to its **standardized dimensions** and compatibility with industry-standard fuse holders and clips. However, proper sizing is essential to match the fuse’s characteristics with the load and semiconductor device being protected. Engineers typically refer to **application-specific data sheets** and **Littelfuse’s technical resources** to determine the optimal fuse rating for their system. The fuse’s **fast-acting nature** means it can interrupt fault currents in **microseconds**, far outpacing slower alternatives and preventing damage to downstream components. This level of protection is particularly valuable in **high-power applications**, where even a brief overcurrent event can lead to significant downtime and repair costs. Littelfuse’s reputation as a leader in circuit protection is built on **innovation, reliability, and customer trust**. The **POWR-SPEED® PSR Series** is a testament to this commitment, offering **superior performance** in applications where failure is not an option. Whether deployed in **renewable energy systems, industrial automation, or heavy machinery**, the **PSR032FL0900** ensures that power semiconductors operate within safe parameters, reducing the risk of unplanned outages and costly repairs. For engineers and maintenance professionals seeking a **high-speed fuse solution** that combines **speed, reliability, and ease of use**, the Littelfuse PSR Series is the clear choice.
  • Ultra-fast response time for critical power semiconductor protection
  • Square body design for reliable installation in industrial enclosures
  • Optimized for variable frequency drives, inverters, UPS systems, and rectifiers
  • Compatible with diodes, IGBTs, SCRs, MOSFETs, and other solid-state devices
  • Trusted by industries like pulp/paper, wastewater treatment, and heavy machinery

Specifications

Amperage Rating
900 Amp
Application
Power conversion devices
Brand Name
Littelfuse
Interrupt Rating
200kA@700VAC
Response Time
Very Fast-Acting (FF)
Series
PSR
Size
Square body
Special Features
Flush End
Sub Brand
POWR-SPEED® PSR Series
Type
Square Body Fuse
Voltage Rating
700/600 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.