Littelfuse PSR033US0450 - 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. Available in Bolted Blade Style Termination (Typical in North American Market) with visual blown fuse indication standard on all fuses and optional Micro-switch for external indication.
Littelfuse

PSR033US0450

Alternate Item Number: PSR033US0450X

UPC: 079458252316


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Overview

The Littelfuse PSR033US0450, part of the highly regarded POWR-SPEED® PSR Series, represents a critical component in safeguarding modern industrial power electronics. Engineered with precision, this high-speed square body fuse is specifically designed to offer ultra-fast protection for sensitive power semiconductor devices. These vital components, including diodes, triacs, IGBTs, SCRs, and MOSFETs, are the backbone of numerous power conversion and conditioning systems, and their susceptibility to transient overcurrents and line surges necessitates specialized protection. Industrial applications demanding robust and rapid circuit protection include variable frequency drives (VFDs), sophisticated inverters, uninterruptible power supplies (UPS), high-efficiency rectifiers, and soft-starters. In these environments, even momentary overcurrent events can lead to catastrophic failure of expensive semiconductor devices, resulting in costly downtime and repairs. The Littelfuse PSR033US0450 addresses this challenge by providing an optimized, extremely fast response time, effectively interrupting fault currents before damage can occur. This proactive protection strategy is essential for maintaining operational continuity and extending the lifespan of critical equipment. Featuring a robust Bolted Blade Style Termination, a common standard in the North American market, the PSR033US0450 ensures secure and reliable electrical connections, crucial for high-power industrial applications. Furthermore, each fuse comes equipped with visual blown fuse indication as a standard feature, allowing for quick and straightforward identification of a tripped fuse during maintenance or troubleshooting. For enhanced operational awareness and integration into larger control systems, an optional Micro-switch is available, providing external indication of fuse status. This allows for remote monitoring and automated response protocols, further enhancing system reliability and safety. Littelfuse's commitment to quality and innovation in circuit protection is evident in the POWR-SPEED® PSR Series. Professionals rely on Littelfuse for dependable solutions that meet the stringent demands of industrial environments. The PSR033US0450 is a testament to this legacy, offering a high-performance fuse that delivers the speed, reliability, and indication features necessary to protect valuable power semiconductor assets and ensure the efficient operation of industrial power systems. Its design prioritizes both immediate fault interruption and ease of maintenance, making it an indispensable choice for engineers and technicians. Key Features and Benefits: * **Ultra-Fast Protection:** Specifically designed for high-speed interruption of fault currents to protect sensitive power semiconductors. * **Broad Semiconductor Compatibility:** Ideal for diodes, triacs, IGBTs, SCRs, MOSFETs, and other solid-state power devices. * **Critical Application Support:** Essential for VFDs, inverters, UPS systems, rectifiers, and soft-starters. * **Secure Termination:** Bolted Blade Style Termination ensures reliable electrical connections. * **Visual Indication:** Standard visual blown fuse indicator for easy identification. * **Optional External Indication:** Micro-switch available for remote monitoring and system integration. * **Optimized Circuit Protection:** Leverages Littelfuse POWR-SPEED® technology for superior performance.
  • High-speed protection for power semiconductor devices (diodes, IGBTs, SCRs, MOSFETs)
  • Optimized for power conversion and conditioning equipment (VFDs, inverters, UPS, rectifiers)
  • Bolted Blade Style Termination for secure industrial connections
  • Standard visual blown fuse indication for easy troubleshooting
  • Optional Micro-switch for external blown fuse status indication

Specifications

Amperage Rating
450 Amp
Application
Power conversion devices
Brand Name
Littelfuse
Connection Type
Bolted Blade
Interrupt Rating
200kA@700VAC
Response Time
Very Fast-Acting (FF)
Series
PSR
Special Features
Bolted Blade
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.