Littelfuse FLNR075 - FLNR075 is a Class RK5 fuse with an ampere rating of 75 and knife-blade-style construction.
Littelfuse

FLNR075

Alternate Item Number: FLNR075.V

UPC: 079458055610


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Overview

The Littelfuse FLNR075 is a robust and reliable Class RK5 fuse engineered for critical industrial circuit protection. Designed with a substantial 75A current rating and featuring a secure knife-blade-style construction, this fuse is an essential component for safeguarding electrical systems in demanding environments. Littelfuse, a globally recognized leader in circuit protection, delivers unparalleled quality and performance with the FLNR075, ensuring peace of mind for engineers and maintenance professionals. This Class RK5 fuse offers superior current-limiting capabilities, providing fast-acting protection against damaging overloads and short circuits. Its design is optimized for industrial applications where consistent and dependable operation is paramount. The knife-blade terminals ensure a solid, low-resistance connection, minimizing heat buildup and maximizing electrical efficiency. This makes the FLNR075 an ideal choice for a wide array of industrial power distribution systems, motor control centers, and heavy machinery. Key applications for the Littelfuse FLNR075 include: * **Motor Protection:** Safeguarding industrial motors from overcurrents that can lead to costly downtime and repairs. * **Power Distribution:** Protecting main feeders and branch circuits in manufacturing plants, processing facilities, and substations. * **Industrial Equipment:** Ensuring the reliable operation of transformers, switchgear, and other critical industrial apparatus. * **HVAC Systems:** Providing essential protection for large-scale commercial and industrial heating, ventilation, and air conditioning units. Engineers and technicians rely on the Littelfuse FLNR075 for its adherence to stringent industry standards and its proven track record of performance. The fuse's construction is built to withstand the rigors of industrial settings, offering durability and longevity. When selecting fuses for industrial applications, factors such as voltage rating, interrupting rating, and fuse class are crucial. The FLNR075, as a Class RK5 fuse, offers a balance of time-delay characteristics and high interrupting capacity, making it versatile for various protection needs. Its 75A rating is suitable for circuits requiring significant current handling capabilities. The intuitive knife-blade design simplifies installation and replacement, contributing to efficient maintenance schedules. For applications demanding uncompromising circuit protection and the trusted quality of Littelfuse, the FLNR075 stands out as a premier solution.
  • Littelfuse FLNR075 Class RK5 fuse
  • 75 Ampere (75A) current rating
  • Secure knife-blade-style construction
  • Designed for industrial circuit protection
  • Reliable overcurrent and short-circuit safeguarding

Specifications

Amperage Rating
75 Amperes
Application
General Purpose
Brand Name
Littelfuse
Class
RK5
Connection Type
Knife-blade
Current Rating
75 A
Element
Dual
Frequency Rating
50/60 HZ
Interrupt Rating
200kA/300kA rms Sym AC/20kA DC Amperes
Material
Dual
Mounting
Blade
Response Time
Blade
Series
Class RK5
Size
5.88"L ; 1.06"D inches
Special Features
Current-limiting
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
POWR-GARD
Type
Time-Delay
Voltage Rating
250AC/125VDC Volts
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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.
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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.