Littelfuse LLNRK007 - 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

LLNRK007

Alternate Item Number: LNRK007.T

UPC: 079458330618


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Overview

The **Littelfuse LLNRK007 POWR-PRO™ fuse** from the **LLNRK/LLSRK series** delivers unmatched overload and short circuit protection for critical electrical systems, supporting service entrance, main, feeder, and general-purpose branch circuits rated up to **600 amperes**. Designed as a direct replacement for lower-interrupting **Class H one-time or renewable fuses**, this high-performance fuse enables seamless system upgrades without requiring modifications to existing Class H fuse blocks. Engineered for reliability in demanding industrial, commercial, and utility applications, the LLNRK007 ensures enhanced safety, operational efficiency, and long-term protection against electrical faults. **Key Features and Benefits** The LLNRK007 is part of Littelfuse’s **POWR-PRO™ series**, a trusted line of fuses renowned for their robust construction and superior interrupting capacity. Unlike conventional fuses, these units provide **high interrupting ratings** (HIR), making them ideal for environments where electrical faults can escalate rapidly. Their **compatibility with existing Class H infrastructure** eliminates the need for costly retrofits, reducing downtime and installation complexity. Additionally, the fuse’s **time-delay design** allows it to withstand temporary overloads without nuisance tripping, a critical feature in applications with motor starts or inrush currents. **Typical Applications and Industries** The LLNRK007 is widely deployed in **industrial facilities, commercial buildings, data centers, hospitals, and utility substations**, where uninterrupted power distribution is paramount. Common use cases include: - **Service entrance protection** for main distribution panels - **Feeder circuit safeguarding** in large-scale electrical systems - **Branch circuit protection** in manufacturing plants and warehouses - **Critical infrastructure support** in renewable energy systems and microgrids Professionals in electrical engineering, maintenance, and facility management rely on Littelfuse’s **POWR-PRO™ series** for its **proven performance** and **industry-leading safety standards**. The LLNRK007, in particular, is favored for its **ease of installation**, **durability**, and **compliance with NEC (National Electrical Code) and UL standards**, ensuring peace of mind in high-stakes environments. **Why Choose Littelfuse?** With over **100 years of innovation** in circuit protection, Littelfuse is a global leader in designing solutions that safeguard electrical systems against faults, surges, and overloads. The **POWR-PRO™ series**, including the LLNRK007, reflects the company’s commitment to **engineering excellence** and **customer-centric design**. Whether upgrading legacy systems or specifying new installations, engineers and contractors trust Littelfuse for **reliable, high-performance fuses** that minimize risk and maximize uptime. **Installation and Compatibility Considerations** The LLNRK007 is engineered for **drop-in replacement** in existing Class H fuse blocks, making it a cost-effective solution for facilities looking to enhance protection without extensive modifications. Its **compact design** and **standardized dimensions** ensure compatibility with a wide range of fuse holders and panels. For optimal performance, professionals should verify: - **Voltage rating** compatibility with the system (typically up to 600V) - **Interrupting rating** alignment with the application’s fault current levels - **Thermal characteristics** to prevent overheating in enclosed panels By selecting the **Littelfuse LLNRK007**, facility managers and electrical contractors invest in a **future-proof solution** that aligns with modern safety regulations while delivering **superior fault protection** for decades to come.
  • Superior overload and short circuit protection for circuits up to 600A
  • Direct replacement for Class H one-time or renewable fuses in existing blocks
  • High interrupting rating for enhanced fault current protection
  • Time-delay design reduces nuisance tripping during temporary overloads
  • Compliant with NEC and UL standards for industrial/commercial applications

Specifications

Amperage Rating
7 Amp
Application
All general purpose circuits
Brand Name
Littelfuse
Current Rating
600 A
Material
Class H fuse material
Material
Fuse (Class H compatible)
Mounting Type
Drop-in replacement in Class H fuse blocks
Series
LLNRK/LLSRK
Series
POWR-PRO™ LLNRK/LLSRK series
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
LLNRK Series
Type
Class RK1
Voltage Rating
600 V
Voltage Rating
600 VAC
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 Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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
9F61 Size B Clips 1.6in

9F61BWW460

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.