Littelfuse LLNRK010 - 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

LLNRK010

Alternate Item Number: LNRK010.T

UPC: 079458330656

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Minimum Qty: 10

Multiplier: 10

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Overview

The **Littelfuse LLNRK010 POWR-PRO™ fuse** from the **LLNRK/LLSRK series** delivers unmatched overload and short-circuit protection for critical electrical systems. Designed for **service entrance, main, feeder, and general-purpose branch circuits up to 600 amperes**, these fuses provide a robust solution for industrial, commercial, and utility applications where reliability and safety are non-negotiable. Engineered to meet stringent industry standards, the LLNRK010 ensures superior performance in demanding environments, from manufacturing plants to data centers and utility substations. **Key Features & Benefits:** - **High Interrupting Rating:** The LLNRK010 offers enhanced short-circuit protection compared to traditional Class H one-time or renewable fuses, reducing the risk of catastrophic equipment failure and downtime. - **Easy Retrofit Compatibility:** Designed to fit existing **Class H fuse blocks**, the LLNRK010 provides a seamless upgrade path for systems currently using lower-rated Class H fuses, eliminating the need for costly infrastructure changes. - **Superior Thermal Performance:** Built with advanced materials, these fuses maintain stable performance under extreme temperatures, ensuring consistent protection even in harsh operating conditions. - **Industry-Recognized Reliability:** Littelfuse is a trusted name in circuit protection, with decades of expertise in designing fuses that meet or exceed **UL, CSA, and IEC standards**, giving engineers and facility managers confidence in their safety and compliance. - **Versatile Applications:** Ideal for **service entrance panels, main distribution boards, feeder circuits, and branch circuits**, the LLNRK010 is a versatile choice for both new installations and system upgrades. **Why Choose Littelfuse POWR-PRO™ Fuses?** When electrical systems demand **precision, durability, and compliance**, the LLNRK/LLSRK series stands out as a premier solution. Unlike generic fuses, Littelfuse’s POWR-PRO™ line is engineered with **high-quality alloys and precision manufacturing** to ensure fast, accurate response to overcurrent events. This reduces nuisance tripping while maximizing protection for sensitive equipment, such as motors, transformers, and control panels. **Typical Applications:** - **Industrial Facilities:** Protects heavy machinery, conveyor systems, and automated production lines where consistent power is critical. - **Commercial Buildings:** Safeguards HVAC systems, lighting circuits, and backup power systems in offices, hospitals, and retail spaces. - **Utility & Power Distribution:** Ensures reliability in substations, switchgear, and renewable energy systems where uptime is paramount. - **Renewable Energy:** Provides dependable protection for solar inverters, wind turbine controllers, and battery storage systems. **Installation & Maintenance Considerations:** The LLNRK010 is designed for **plug-in installation**, making it a straightforward replacement for existing Class H fuses. Professionals should verify compatibility with their fuse block and ensure proper torque settings during installation to maintain optimal performance. Regular inspections for signs of wear or overheating are recommended to extend service life and prevent unplanned outages. **Why Trust Littelfuse?** With over **100 years of innovation in circuit protection**, Littelfuse has earned a reputation for delivering products that combine **engineering excellence with real-world reliability**. The POWR-PRO™ series, including the LLNRK010, reflects this commitment by offering fuses that are **tested, certified, and trusted** by electricians, engineers, and facility managers worldwide. Whether upgrading legacy systems or designing new installations, the LLNRK010 provides the peace of mind that comes from choosing a leader in electrical safety.
  • 600A rated for service entrance, main, feeder, and branch circuits
  • Class H rated for compatibility with existing fuse blocks
  • Superior overload and short-circuit protection
  • Easy retrofit upgrade from lower-rated Class H fuses
  • Meets UL, CSA, and IEC industry standards

Specifications

Amperage Rating
10 Amp
Application
All general purpose circuits
Brand Name
Littelfuse
Connection Type
Plug-in
Current Rating
600 A
Material
High-quality alloys
Nema Rating
Class H
Series
POWR-PRO™ (LLNRK/LLSRK series)
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
LLNRK Series
Type
Class RK1
Package Weight (Imperial)
0.045 L
Package Weight (Metric)
20.600 g
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 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
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

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

9F61BWW460

9F61 Size B Clips 1.6in

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.