Littelfuse FLNR600 - FLNR600 is a Class RK5 fuse with an ampere rating of 600 and knife-blade-style construction.
Littelfuse

FLNR600

Alternate Item Number: FLNR600.X

UPC: 079458150988


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Overview

The Littelfuse FLNR600 is a high-performance Class RK5 fuse engineered for rigorous industrial environments where reliable overcurrent protection is non-negotiable. Rated at 600A, this fuse is part of the FLNR series, featuring a robust knife-blade-style construction that ensures secure electrical contact and simplified installation in high-power distribution systems. Designed to meet Class RK5 standards, the FLNR600 delivers precise fault interruption while maintaining compliance with stringent industry regulations, making it an essential component in modern electrical infrastructure. Industrial professionals rely on the FLNR600 for applications such as power distribution panels, motor control centers, and feeder circuits where high fault currents and continuous operation demand dependable protection. Its knife-blade connection design facilitates quick and tool-free installation, reducing downtime during maintenance or upgrades. The fuse’s Class RK5 rating—recognized for its high interrupting capacity and time-current characteristics—ensures compatibility with a wide range of protective devices, providing system designers with flexibility in coordination and selectivity. Littelfuse, a global leader in circuit protection solutions, has built a reputation for engineering products that withstand the harshest conditions. The FLNR600 exemplifies this commitment, offering: - **High Interrupting Capacity**: Engineered to safely interrupt high fault currents, protecting downstream equipment from catastrophic damage. - **Knife-Blade Connection**: Ensures low-resistance contact and ease of installation in knife-blade fuse holders, minimizing installation errors. - **Class RK5 Compliance**: Meets NEMA standards for time-current performance, ensuring predictable and reliable operation in critical systems. - **Durable Construction**: Built to withstand mechanical stress, vibration, and thermal cycling in industrial environments. - **Wide Application Range**: Suitable for motor circuits, transformers, busway systems, and other high-current industrial applications. Selecting the right fuse for an industrial application requires balancing performance, safety, and compliance. The FLNR600 is trusted by electrical engineers and maintenance teams for its consistent performance under load, reducing the risk of nuisance tripping while providing robust protection against short circuits and overloads. Its knife-blade design also simplifies replacement, allowing technicians to service systems efficiently without specialized tools. Littelfuse’s global manufacturing footprint and rigorous quality control processes ensure that every FLNR600 fuse meets the highest standards of reliability. Whether deployed in manufacturing plants, data centers, or utility substations, this fuse delivers the durability and precision required for mission-critical operations. For professionals seeking a proven solution for high-current circuit protection, the Littelfuse FLNR600 stands as a benchmark in industrial fuse technology.
  • 600A current rating for high-power industrial applications
  • Class RK5 compliance for reliable fault interruption
  • Knife-blade connection for secure, tool-free installation
  • High interrupting capacity for short-circuit protection
  • Durable construction for harsh industrial environments

Specifications

Application
General Purpose
Brand Name
Littelfuse
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
POWR-GARD FLNR 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.