Littelfuse FLNR003 - FLNR003 is a Class RK5 fuse with an ampere rating of 3 and cartridge-style construction.
Littelfuse

FLNR003

Alternate Item Number: FLNR003.T

UPC: 079458150476


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Overview

The **Littelfuse FLNR003** is a precision-engineered **Class RK5 fuse** designed to deliver superior circuit protection in demanding industrial environments. With a **3A ampere rating** and **cartridge-style construction**, this fuse provides fast, accurate overcurrent interruption to safeguard sensitive electronic components, motors, transformers, and control systems. Engineered to meet the rigorous demands of modern industrial applications, the FLNR003 ensures operational reliability while minimizing downtime and equipment damage. Class RK5 fuses are a critical component in electrical distribution systems, offering a balance between high interrupting capacity and precise current limitation. The **FLNR003** adheres to stringent industry standards, including UL and IEC certifications, making it a trusted choice for engineers and technicians who require consistent performance in harsh conditions. Its **cartridge-style design** allows for easy installation and replacement in panelboards, switchgear, and motor control centers, ensuring compatibility with standard fuse blocks and holders. **Key Applications & Industries:** The Littelfuse FLNR003 is ideally suited for a wide range of industrial applications, including: - **Motor control and protection** in HVAC systems, pumps, and conveyors - **Power distribution panels** in manufacturing plants and data centers - **Control circuits** for automation systems and PLCs - **Lighting and lighting control systems** in commercial and industrial facilities - **Machine tool applications** where precise overcurrent protection is essential **Why Choose Littelfuse?** Littelfuse is a global leader in circuit protection solutions, renowned for its innovation, reliability, and adherence to industry standards. With decades of expertise in fuse technology, the company designs products that deliver **superior performance, safety, and longevity**. The **FLNR003** exemplifies this commitment, offering: - **High interrupting rating** to handle fault currents in industrial systems - **Fast response time** to protect sensitive electronics from damage - **Robust construction** for durability in challenging environments - **Wide compatibility** with standard fuse holders and panels - **Compliance with UL 248 and other regulatory standards** **Installation & Maintenance Considerations:** Proper installation is critical to ensuring the FLNR003 operates as intended. Professionals should: - Verify the fuse’s ampere rating matches the circuit requirements to prevent nuisance tripping or inadequate protection. - Ensure the fuse holder or panel is rated for the fuse’s voltage and interrupting capacity. - Inspect the fuse and holder for signs of wear, corrosion, or damage before installation. - Replace fuses only with identical specifications to maintain system integrity. For engineers and facility managers seeking a **reliable, high-performance fuse** for industrial applications, the **Littelfuse FLNR003** is a proven solution. Its **Class RK5 classification** ensures it meets the demands of modern electrical systems, providing peace of mind in critical operations. Whether protecting motors, control circuits, or power distribution networks, this fuse delivers the performance and safety required in today’s industrial landscape.
  • Class RK5 fuse with 3A ampere rating for precise overcurrent protection
  • Cartridge-style construction for easy installation and compatibility
  • High interrupting capacity for industrial motor and control circuits
  • UL and IEC certified for compliance with industry standards
  • Trusted Littelfuse quality for long-term reliability

Specifications

Application
General Purpose
Brand Name
Littelfuse
Current Rating
3 A
Nema Rating
Class RK5
Series
Class RK5
Series
FLNR
Size
Cartridge-style
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
POWR-GARD FLNR Series
Type
Class RK5
Package Weight (Imperial)
0.048 L
Package Weight (Metric)
21.790 g
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9F61 Size B Clips 1.6in

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9F61 Size B Clips 1.6in
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.

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.