Littelfuse KLKR020S - KLKR series Class CC fuses are fast-acting fuses intended for general-purpose branch circuit protection. Their compact size, fast-acting overload response, and their highly current limiting design make them ideal for use in OEM equipment and control panels because Solid-state devices such as SCRs and other electronic equipment generally require fast-acting protection.
Littelfuse

KLKR020S

Alternate Item Number: KLKR020.TS

UPC: 079458189858

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Minimum Qty: 10

Multiplier: 10

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Overview

The **Littelfuse KLKR020S Class CC fuse** is a high-performance, fast-acting overcurrent protection solution engineered for modern industrial and commercial applications. Designed for **general-purpose branch circuit protection**, this 20-ampere fuse combines a **compact form factor** with **rapid response characteristics**, making it an ideal choice for protecting sensitive electronic components in OEM equipment, control panels, and machinery. With its **highly current-limiting design**, the KLKR020S minimizes fault currents swiftly, reducing the risk of catastrophic damage to downstream devices such as solid-state components (e.g., SCRs, thyristors, and semiconductors), which are particularly vulnerable to transient overcurrent events. **Key Features and Benefits:** - **Fast-Acting Response:** The KLKR020S provides near-instantaneous interruption during overload conditions, ensuring critical protection for electronic circuits where even millisecond delays can lead to component failure. This is especially critical in applications involving **variable frequency drives (VFDs), motor controllers, and power conversion systems**, where rapid fault clearance is essential to prevent cascading failures. - **High Current-Limiting Performance:** Engineered with a **highly current-limiting design**, this fuse significantly reduces the let-through energy during fault conditions, protecting downstream equipment from excessive thermal and mechanical stress. This feature is particularly valuable in **industrial automation, renewable energy systems, and data center power distribution**, where reliability and uptime are paramount. - **Compact Class CC Compliance:** The **Class CC** rating ensures compatibility with standardized fuse holders and panels, offering a **space-saving solution** without compromising protection capabilities. Its small footprint makes it an excellent fit for **compact control panels, enclosures, and OEM machinery**, where real estate is at a premium. - **Versatile Application Range:** The KLKR020S is suitable for a wide array of industrial and commercial environments, including **manufacturing plants, commercial buildings, and renewable energy installations**. It is particularly well-suited for protecting **sensitive electronic loads**, such as PLCs, sensors, and communication equipment, where consistent power quality is required. - **Reliable Manufacturer Backing:** Littelfuse, a globally recognized leader in circuit protection solutions, has designed the KLKR series to meet stringent industry standards, including **UL 248-4** and **CSA certification**. With decades of expertise in fuse technology, Littelfuse ensures that the KLKR020S delivers **consistent performance, durability, and safety** across diverse operating conditions. **Typical Applications:** - **OEM Equipment:** Ideal for integration into original equipment manufacturer designs, where space constraints and reliability are critical. Commonly used in **machine tools, automation systems, and industrial robots**. - **Control Panels:** Provides essential protection for branch circuits in **motor control centers (MCCs), switchgear, and distribution panels**, safeguarding against short circuits and overloads. - **Electronic Loads:** Essential for protecting **solid-state devices, power supplies, and electronic controllers** in applications such as **HVAC systems, lighting controls, and renewable energy inverters**. - **Renewable Energy Systems:** Used in **solar inverters, wind turbine controllers, and battery management systems** to ensure safe and efficient power distribution. **Installation and Selection Considerations:** When selecting the KLKR020S, professionals should consider the **load characteristics, ambient temperature, and fault current ratings** of the system. Proper sizing ensures optimal protection while avoiding nuisance tripping. Installation should follow **NEC (National Electrical Code) guidelines** and manufacturer recommendations to maintain safety and performance. For applications with high inrush currents or inductive loads, consulting Littelfuse’s technical documentation or a certified electrician is advised. **Why Choose Littelfuse?** Littelfuse is a trusted name in circuit protection, with a reputation for innovation, quality, and reliability. The KLKR series, including the **KLKR020S**, reflects the company’s commitment to delivering **high-performance, cost-effective solutions** that meet the evolving needs of industrial and commercial markets. Whether for new installations or retrofits, the KLKR020S provides a **proven, dependable solution** for fast-acting overcurrent protection in demanding environments.
  • 20A fast-acting Class CC fuse for general-purpose branch circuit protection
  • Highly current-limiting design minimizes fault energy for superior equipment safety
  • Compact size ideal for space-constrained OEM equipment and control panels
  • Fast response protects sensitive solid-state devices (SCRs, thyristors, semiconductors)
  • UL 248-4 and CSA certified for industrial and commercial applications

Specifications

Application
General Purpose
Brand Name
Littelfuse
Current Rating
20 A
Series
KLKR
Size
Compact Class CC
Special Features
Fast-Acting
Standard
248-4 UL Listed/CSA
Sub Brand
KLKR Series
Type
Class CC
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9F61 Size B Clips 1.6in

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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.