Littelfuse KLNR080 - KLNR/KLSR series RK1 fast-acting fuses were the earliest type of current-limiting fuse developed. Their single-element, silver link design enables them to provide fast-acting overload and short-circuit protection. When used to protect inductive loads such as motors, solenoids, and transformers, KLNR/KLSR series fuses must be greatly oversized to prevent opening the fuses on harmless inrush currents. In such applications, KLNR/KLSR series fuses may only provide short-circuit protection. We recommend using POWR-PRO™ LLNRK/LLSRK series RK1, dual-element, time-delay fuses in all new applications requiring the current-limiting ability of UL Class RK1 fast-acting fuses, or in existing applications where fast-acting RK1 or RK5 fuses have been opening on harmless system surges such as motor starting currents.
Littelfuse

KLNR080

Alternate Item Number: KLNR080.V

UPC: 079458280807

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Overview

The **Littelfuse KLNR080 RK1 fast-acting fuse** is a high-performance, single-element current-limiting fuse engineered for rapid response to fault conditions in industrial and commercial electrical systems. Part of the trusted KLNR/KLSR series, this fuse leverages a **silver link design** to deliver exceptional overload and short-circuit protection, ensuring system safety and reliability. Unlike standard fuses, the KLNR080 is optimized for applications where fast-acting response is critical, making it an ideal choice for protecting sensitive equipment from damaging fault currents. **Key Features & Benefits:** - **Single-Element, Silver Link Design:** The KLNR080’s silver link construction enables ultra-fast response to fault conditions, minimizing downtime and reducing the risk of catastrophic equipment failure. Silver’s superior conductivity ensures consistent performance even in high-temperature environments. - **UL Class RK1 Rated:** Certified for UL Class RK1 applications, the KLNR080 meets stringent industry standards for current-limiting fuses, providing peace of mind in critical applications. Its fast-acting nature makes it particularly effective in protecting non-inductive loads such as control panels, lighting circuits, and distribution systems. - **Current-Limiting Capability:** As a current-limiting fuse, the KLNR080 can interrupt fault currents before they reach damaging levels, reducing stress on downstream components and extending the lifespan of connected equipment. This feature is especially valuable in systems with high prospective fault currents. **Applications & Industry Use Cases:** The KLNR080 is widely used in a variety of industrial and commercial applications where rapid fault interruption is essential. Typical use cases include: - **Motor control centers (MCCs):** Protecting branch circuits and control wiring from overloads and short circuits. - **Transformers:** Safeguarding distribution transformers from internal faults and external short circuits. - **Switchgear & panelboards:** Providing backup protection in low-voltage switchgear and distribution panels. - **Machine tools & automation systems:** Ensuring reliable operation in manufacturing environments where equipment reliability is paramount. - **Lighting and HVAC systems:** Protecting branch circuits in commercial buildings and facilities. **Important Considerations for Inductive Loads:** While the KLNR080 excels in protecting non-inductive loads, it is **not recommended for direct use on inductive loads** such as motors, solenoids, or transformers without significant oversizing. Inrush currents associated with these loads can cause nuisance tripping, leading to unnecessary downtime. For applications involving inductive loads, Littelfuse recommends the **POWR-PRO™ LLNRK/LLSRK series dual-element, time-delay fuses**, which are specifically designed to handle inrush currents while still providing robust short-circuit protection. **Why Choose Littelfuse?** Littelfuse is a global leader in circuit protection, with over **100 years of innovation** in fuse technology. The company’s fuses are trusted by engineers and technicians worldwide for their reliability, precision, and adherence to industry standards. The KLNR080, like all Littelfuse products, undergoes rigorous testing to ensure consistent performance in the most demanding environments. Whether you’re protecting sensitive electronics, industrial machinery, or critical infrastructure, Littelfuse delivers solutions that prioritize safety, efficiency, and longevity. **Installation & Compliance:** The KLNR080 is designed for easy installation in standard fuse holders and panels. Its compact design allows for efficient use of panel space, while its robust construction ensures durability in harsh industrial conditions. Always follow local electrical codes and manufacturer guidelines when installing and replacing fuses to ensure optimal performance and safety. For new installations or systems experiencing frequent nuisance tripping due to inrush currents, consider upgrading to Littelfuse’s **POWR-PRO™ LLNRK/LLSRK series fuses**, which offer time-delay characteristics to accommodate transient surges while maintaining superior short-circuit protection. Trust Littelfuse to provide the right fuse solution for your application, backed by decades of expertise and a commitment to innovation.
  • Single-element, silver link design for fast-acting fault response
  • UL Class RK1 rated for current-limiting protection in industrial systems
  • Optimized for non-inductive loads like control panels and lighting circuits
  • Current-limiting capability reduces stress on downstream equipment
  • Trusted by engineers worldwide for reliability and precision

Specifications

Amperage Rating
12 Amp
Application
DC control circuits/Solar
Brand Name
Littelfuse
Material
Silver
Series
KLNR/KLSR
Special Features
Fast-Acting
Standard
UL 2579 IEC 60269-6
Sub Brand
POWR-GARD KLKD Series
Type
UL Supplemental
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.