Littelfuse FLSR450 - FLSR450 is a Class RK5 fuse with an ampere rating of 450 and knife-blade-style construction.
Littelfuse

FLSR450

Alternate Item Number: FLSR450.X

UPC: 079458170955


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Overview

The **Littelfuse FLSR450** is a high-performance **Class RK5 fuse** engineered for critical industrial applications where reliable overcurrent protection is non-negotiable. With a **450A ampere rating** and **knife-blade-style construction**, this fuse delivers robust performance in high-demand environments, ensuring the safety and longevity of electrical systems. Designed to meet the stringent requirements of modern industrial operations, the FLSR450 is a trusted solution for professionals who prioritize durability, precision, and compliance with safety standards. **Key Features and Benefits:** - **Class RK5 Rating**: The FLSR450 adheres to the **RK5 classification**, which is recognized for its high interrupting rating and superior performance in industrial settings. This rating ensures the fuse can safely interrupt high fault currents, reducing the risk of catastrophic system failures and equipment damage. - **450A Ampere Rating**: With a **450-ampere rating**, this fuse is ideal for protecting heavy-duty electrical systems, including power distribution panels, motor control centers, and industrial machinery. Its capacity makes it suitable for applications where consistent, high-current loads are present. - **Knife-Blade-Style Construction**: The **knife-blade design** of the FLSR450 ensures secure and stable connections within fuse blocks or holders. This construction minimizes the risk of poor contact, which can lead to overheating or arcing, thereby enhancing system reliability and safety. - **Industrial-Grade Durability**: Built to withstand the harsh conditions of industrial environments, the FLSR450 is constructed from high-quality materials that resist corrosion, vibration, and thermal stress. This durability translates to longer service life and reduced maintenance costs. - **Compliance with Safety Standards**: The FLSR450 meets or exceeds **UL 248-14** and other relevant safety standards, providing assurance that it has been rigorously tested for performance and reliability. This compliance is critical for facilities that must adhere to strict regulatory requirements. **Typical Applications:** The **Littelfuse FLSR450** is a versatile solution for a wide range of industrial applications, including: - **Power Distribution Panels**: Protecting feeders and branch circuits in commercial and industrial buildings. - **Motor Control Centers (MCCs)**: Safeguarding motors and associated equipment from overloads and short circuits. - **Industrial Machinery**: Providing overcurrent protection for heavy machinery in manufacturing plants, including CNC machines, conveyors, and pumps. - **Renewable Energy Systems**: Ensuring the safety of solar inverters, wind turbines, and battery storage systems. - **Data Centers and Critical Infrastructure**: Offering reliable protection for sensitive electronic equipment where downtime is not an option. **Why Choose Littelfuse?** Littelfuse is a global leader in circuit protection, with over a century of innovation and expertise in designing solutions that safeguard electrical systems. The company’s **FLSR450 fuse** is backed by decades of research, rigorous testing, and a commitment to quality that professionals worldwide trust. When reliability and performance are paramount, Littelfuse delivers fuses that meet the demands of the most challenging industrial environments. **Installation and Maintenance Considerations:** Proper installation of the **FLSR450** is essential to ensure optimal performance. Professionals should: - Verify that the fuse is compatible with the system’s voltage and current requirements. - Ensure the knife-blade contacts are clean and free of debris to prevent poor connections. - Follow manufacturer guidelines for fuse holder compatibility and mounting. - Regularly inspect fuses for signs of wear, damage, or overheating, and replace them as needed to maintain system integrity. For industrial operators seeking a **high-performance, Class RK5 fuse** that combines reliability, durability, and compliance with safety standards, the **Littelfuse FLSR450** is the ideal choice. Trust Littelfuse to protect your critical infrastructure with solutions that deliver peace of mind and operational excellence.
  • Class RK5 rating for high interrupting capacity
  • 450A ampere rating for heavy-duty industrial applications
  • Knife-blade-style construction for secure connections
  • Meets UL 248-14 and other safety standards
  • Industrial-grade durability for harsh environments

Specifications

Application
General Purpose
Brand Name
Littelfuse
Connection Type
Knife-blade
Current Rating
450 A
Nema Rating
Class RK5
Series
Class RK5
Series
FLSR
Size
Knife-blade-style
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
POWR-GARD FLSR Series
Type
Class RK5
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.