Littelfuse LLNRK015 - Littelfuse LLNRK and LLSRK series POWR-PRO™ fuses provide superior overload and short circuit protection for service entrance, main, feeder and general-purpose branch circuits up to 600 amperes. LLNRK/LLSRK series fuses can be installed in existing Class H fuse blocks to upgrade systems containing lower interrupting rating Class H one-time or renewable fuses.
Littelfuse

LLNRK015

Alternate Item Number: LNRK015.T

UPC: 079458330687

Documents & Media
BrochureTechnical BulletinTechnical DrawingSpecification Sheet

Contact for Pricing

Overview

The **Littelfuse LLNRK015 POWR-PRO™ fuse** delivers superior overload and short-circuit protection for critical electrical circuits up to 600 amperes, making it an ideal solution for service entrance, main, feeder, and general-purpose branch circuit applications. Designed to meet the demands of modern industrial and commercial electrical systems, this high-performance fuse ensures reliable protection against faults while enhancing system safety and efficiency. Engineered as part of Littelfuse’s industry-leading POWR-PRO™ series, the LLNRK015 is built to exceed the stringent requirements of UL 248 standards, providing dependable performance in even the most challenging environments. **Key Applications and Industry Use Cases** The LLNRK015 is particularly well-suited for applications requiring robust fault protection, including: - **Service entrance panels** where reliable fault interruption is critical to prevent damage to downstream equipment. - **Main and feeder circuits** in industrial facilities, data centers, and commercial buildings, ensuring continuous operation and minimizing downtime. - **Branch circuits** in manufacturing plants, hospitals, and infrastructure projects where electrical safety and compliance are non-negotiable. - **System upgrades** from lower interrupting rating Class H one-time or renewable fuses, offering a seamless transition to higher-performance protection without extensive modifications. **Seamless Integration and Upgrade Capability** One of the standout features of the LLNRK015 is its compatibility with existing **Class H fuse blocks**, allowing for straightforward retrofitting in systems originally designed for lower-rated fuses. This compatibility eliminates the need for costly infrastructure changes, reducing both installation time and expenses. Professionals in the electrical industry trust Littelfuse’s POWR-PRO™ series for its ability to enhance system reliability while maintaining compliance with NEC and other regulatory standards. **Superior Protection and Performance** The LLNRK015 is engineered with a **high interrupting rating** to safely clear both overload and short-circuit conditions, protecting valuable equipment and personnel from electrical hazards. Its robust construction ensures durability in harsh industrial environments, while its precise time-current characteristics provide optimal coordination with downstream protective devices. This level of performance is essential for industries where electrical faults can lead to costly downtime, equipment damage, or even safety risks. **Why Choose Littelfuse?** Littelfuse is a global leader in circuit protection, with over a century of innovation and expertise in developing solutions that safeguard electrical systems. The POWR-PRO™ series, including the LLNRK015, reflects the company’s commitment to delivering high-quality, reliable products that meet the evolving needs of industrial and commercial applications. With a reputation for excellence and a focus on safety, Littelfuse products are trusted by engineers, electricians, and facility managers worldwide. **Installation and Maintenance Considerations** Installing the LLNRK015 is straightforward, thanks to its standardized dimensions and compatibility with Class H fuse blocks. However, proper sizing and coordination with other protective devices are essential to ensure optimal performance. Professionals should consult the manufacturer’s guidelines and local electrical codes to confirm compatibility and compliance. Regular inspections and maintenance help maintain the fuse’s reliability over time, ensuring long-term protection for critical circuits. **Conclusion** For electrical professionals seeking a high-performance fuse that delivers reliable overload and short-circuit protection, the **Littelfuse LLNRK015 POWR-PRO™ fuse** is an excellent choice. Its compatibility with existing systems, superior protection capabilities, and trusted manufacturer backing make it a valuable addition to any industrial or commercial electrical infrastructure. Whether upgrading an existing system or designing a new installation, the LLNRK015 provides the peace of mind that comes with superior circuit protection.
  • 600A rated for service entrance, main, feeder, and branch circuits
  • Superior overload and short-circuit protection per UL 248 standards
  • Compatible with existing Class H fuse blocks for easy upgrades
  • High interrupting rating for reliable fault clearance
  • Trusted Littelfuse POWR-PRO™ series for industrial reliability

Specifications

Amperage Rating
15 Amp
Application
All general purpose circuits
Brand Name
Littelfuse
Current Rating
600 A
Nema Rating
Class H
Series
LLNRK/LLSRK POWR-PRO™
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
LLNRK Series
Type
Class RK1
Voltage Rating
600 VAC
Package Weight (Imperial)
0.046 L
Package Weight (Metric)
0.021 kg
RK1 fuses are extremely current-limiting fuses meaning they greatly reduce or eliminate damage to circuits and equipment under short-circuit conditions. Replacing existing Class H, K and RK5 fuses with RK1 fuses is one of the easiest ways to immediately improve the protection of plant workers and equipment.

LLSRK020

RK1 fuses are extremely current-limiting fuses meaning they greatly reduce or eliminate damage to circuits and equipment under short-circuit conditions. Replacing existing Class H, K and RK5 fuses with RK1 fuses is one of the easiest ways to immediately improve the protection of plant workers and equipment.

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.