Littelfuse FLNR004 - FLNR004 is a Class RK5 fuse with an ampere rating of 4 and cartridge-style construction.
Littelfuse

FLNR004

Alternate Item Number: FLNR004.T

UPC: 079458150537


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Overview

The Littelfuse FLNR004 is a critical component for ensuring the safety and operational integrity of industrial electrical systems. As a Class RK5 fuse, it is engineered to provide superior overcurrent protection, safeguarding sensitive equipment from damage caused by short circuits and overloads. This 4-ampere rated fuse features a robust cartridge-style construction, a design that is widely recognized for its reliability and ease of replacement in demanding industrial environments. Littelfuse, a globally recognized leader in circuit protection, brings its extensive expertise to the FLNR004. This fuse is built to meet stringent industry standards, offering dependable performance that professionals can trust. Its primary function is to act as a sacrificial element, interrupting the flow of current when it exceeds safe levels, thereby preventing catastrophic failures and costly downtime. The FLNR004's 4A rating makes it suitable for a variety of applications where precise current limitation is required, such as in motor control circuits, power distribution panels, and control systems for manufacturing machinery. The cartridge-style design of the FLNR004 offers several advantages for industrial settings. It ensures a secure fit within fuse holders, minimizing the risk of poor connections that can lead to overheating or intermittent faults. This construction also provides enhanced safety during fuse replacement, as the fuse body is typically insulated, reducing the likelihood of accidental contact with live components. Professionals often select fuses like the FLNR004 based on the specific current requirements of the circuit, the interrupting rating needed for the application, and the fuse class that best suits the protection strategy. Key benefits of employing the Littelfuse FLNR004 include: * **Reliable Overcurrent Protection:** Effectively shields electrical equipment from damaging surges and faults. * **Class RK5 Performance:** Offers a high interrupting rating suitable for many industrial applications. * **Durable Cartridge Construction:** Ensures longevity and safe, easy handling. * **Precise 4A Rating:** Ideal for circuits requiring specific current limitation. * **Trusted Littelfuse Quality:** Backed by a manufacturer renowned for circuit protection excellence. Applications for the FLNR004 are diverse, spanning numerous industrial sectors. It is commonly found protecting: motor starters, control transformers, lighting circuits, and various power supply units. Its compact form factor allows for integration into tight spaces within electrical enclosures and control cabinets. When specifying fuses for industrial equipment, engineers and maintenance personnel rely on products like the FLNR004 for their consistent performance and adherence to safety regulations. Choosing the correct fuse rating and class is paramount to achieving optimal protection without nuisance tripping, and the FLNR004 provides a dependable solution for many such requirements. Trust in Littelfuse's commitment to quality and innovation for all your industrial circuit protection needs.
  • Littelfuse FLNR004 Class RK5 fuse
  • 4 Ampere (4A) current rating
  • Durable cartridge-style construction
  • Provides reliable overcurrent protection
  • Ideal for industrial circuit safety applications

Specifications

Application
General Purpose
Brand Name
Littelfuse
Current Rating
4 A
Material
Cartridge
Series
Class RK5
Series
FLNR
Size
Cartridge
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
POWR-GARD FLNR Series
Type
Class RK5
Package Weight (Imperial)
0.041 L
Package Weight (Metric)
18.800 g
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Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

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Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

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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.