Littelfuse LLSRK050 RK1 fuses are extremely current-limiting fuses meaning they greatly reduce or eliminate…

Name: Littelfuse RK1 Fuses (LLSRK050) offer superior current-limiting protection for industrial circuits.
Brand: Littelfuse
SKU: LLSRK050
Availability: InStock

Alternate Item Number: LSRK050.T

UPC: 079458350777

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Overview

The Littelfuse RK1 fuse, SKU LLSRK050, represents a significant advancement in industrial circuit protection, engineered to provide exceptional current-limiting capabilities. This means that under severe short-circuit conditions, the RK1 fuse drastically minimizes or entirely eliminates the damaging effects on sensitive electrical circuits and valuable equipment. For facilities looking to immediately enhance safety and operational reliability, upgrading from older Class H, Class K, or RK5 fuses to Littelfuse RK1 fuses is a straightforward and highly effective strategy. This upgrade directly contributes to better protection for plant personnel and critical machinery. Littelfuse, a globally recognized leader in circuit protection, brings its extensive expertise to the RK1 fuse series. These fuses are designed with advanced materials and construction techniques to achieve superior performance metrics, particularly in their ability to interrupt fault currents rapidly and with minimal let-through energy. This rapid interruption is crucial for preventing catastrophic failures, reducing arc flash hazards, and minimizing downtime associated with equipment damage. The LLSRK050 model is a testament to Littelfuse's commitment to providing robust and reliable solutions for demanding industrial environments. Key benefits of integrating Littelfuse RK1 fuses into your electrical infrastructure include: * **Enhanced Safety:** Significantly reduces the risk of electrical hazards for workers by limiting fault energy. * **Equipment Protection:** Prevents extensive damage to motors, transformers, switchgear, and other vital components. * **Reduced Downtime:** Minimizes operational interruptions and associated repair costs by preventing cascading failures. * **Compliance:** Helps meet stringent industry safety standards and regulations for electrical installations. * **Upgrade Path:** Offers a direct and cost-effective replacement for older fuse classes, providing immediate performance improvements. The application scope for RK1 fuses is broad, encompassing critical systems within manufacturing plants, power distribution networks, data centers, and any industrial setting where reliable and high-performance overcurrent protection is paramount. Their ability to handle high interrupting ratings and provide precise current limitation makes them ideal for protecting large motor loads, transformers, and main service disconnects. When selecting fuses, engineers and maintenance professionals consider factors such as voltage rating, current rating, interrupting rating, and the specific protection characteristics required for the circuit. The RK1 fuse's current-limiting nature is a key differentiator, offering a higher level of protection than many traditional fuses. Choosing Littelfuse for your circuit protection needs ensures you are investing in quality, reliability, and cutting-edge technology. The LLSRK050 RK1 fuse is designed for longevity and consistent performance, even under the most challenging operating conditions. Its robust construction ensures it will perform as expected when called upon, safeguarding your investments and ensuring the continuous operation of your facility. By adopting Littelfuse RK1 fuses, you are not just replacing a component; you are implementing a superior protection strategy that enhances safety, preserves equipment, and optimizes operational efficiency.

Extremely current-limiting for superior short-circuit protection
Significantly reduces or eliminates equipment damage under fault conditions
Ideal upgrade for Class H, K, and RK5 fuses
Enhances safety for plant workers and critical equipment
Manufactured by Littelfuse, a trusted leader in circuit protection

Specifications

Amperage Rating	50 Amp
Amperage Rating	50 A
Application	All general purpose circuits
Brand Name	Littelfuse
Series	RK1
Special Features	Time-Delay
Standard	Standard 248-12 UL Listed/CSA
Sub Brand	LLSRK Series
Type	Class RK1
Package Weight (Imperial)	0.361 L
Package Weight (Metric)	163.900 g

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LCC5

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Frequently Asked Questions

What types of fuses does Littelfuse offer for industrial applications?

Littelfuse offers UL Class fuses, high-speed fuses, medium voltage fuses, 10 x 38 mm fuses, and solar fuses for industrial applications.

What are high-speed fuses used for?

High-speed fuses protect critical power semiconductor devices against short circuits in power conversion applications like inverters and variable-speed drives.

What do medium voltage fuses protect?

E-rated and R-rated medium voltage fuses protect transformers, potential transformers, feeders, and motor circuits.

What are the voltage and current ratings for 10 x 38 mm fuses?

10 x 38 mm fuses are available with ratings from 125 to 1000 volts and 1/10 to 30 amperes.

What is the maximum DC voltage for Littelfuse solar fuses?

Littelfuse offers solar fuses and holders up to 1500 Vdc for photovoltaic applications.

What is the purpose of POWR-BLOKS power distribution blocks?

POWR-BLOKS power distribution blocks provide a safe and convenient way to splice cables and manage power distribution within panels and systems.

What are pre-engineered fusible switches and panels designed for?

Pre-engineered fusible switches and panels are UL Listed, customizable products designed to meet NEC coordination requirements, ideal for the Construction Market.

What conditions do Littelfuse feeder protection relays guard against?

Feeder protection relays protect circuits from overcurrent, ground faults, phase loss, overload, and other detrimental conditions.

What is the Industrial Shock-Block® GFCI designed for?

The Industrial Shock-Block® GFCI is designed for people protection in industrial facilities and meets UL Standard 943C Class C and Class D.

How do resistance grounding systems limit damage?

High-resistance grounding limits point-of-fault damage and eliminates arc-flash hazards and transit overvoltages associated with ground faults.

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.