Littelfuse KLK020S - Fast-acting, high-interrupting capacity, current-limiting type fuse. Especially suited for control circuits, street lighting, H.I.D. lighting, computers, and other applications without high inrush currents.
Littelfuse

KLK020S

Alternate Item Number: 0KLK020.TS

UPC: 079458189728


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Multiplier: 10

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Overview

The **Littelfuse KLK020S** is a **fast-acting, high-interrupting capacity current-limiting fuse** engineered for precise overcurrent protection in critical applications where rapid response and reliability are paramount. Designed to safeguard sensitive equipment from damaging fault currents, this fuse combines **superior interrupting ratings** with **low inrush current compatibility**, making it an ideal choice for a wide range of industrial, commercial, and infrastructure applications. Whether protecting control circuits, street lighting systems, high-intensity discharge (H.I.D.) lighting, or computer hardware, the KLK020S delivers consistent performance in environments where downtime and equipment failure cannot be tolerated. **Key Features and Benefits** This **current-limiting fuse** is specifically optimized for applications that do not experience high inrush currents, ensuring optimal operation without nuisance tripping. Its **fast-acting design** responds almost instantaneously to overcurrent conditions, isolating faults before they escalate into catastrophic failures. The **high interrupting capacity** of the KLK020S allows it to safely clear high fault currents, protecting downstream components and maintaining system integrity. Unlike standard fuses, current-limiting fuses like the KLK020S **limit the let-through energy** during a fault, significantly reducing the risk of damage to connected equipment. **Versatile Applications Across Industries** The KLK020S is trusted by professionals in multiple sectors due to its adaptability and robust performance. In **control circuits**, it provides reliable protection for PLCs, relays, and other control devices, ensuring uninterrupted operation in automation and process control systems. For **street lighting networks**, this fuse safeguards LED and H.I.D. fixtures from transient surges and short circuits, extending the lifespan of expensive lighting infrastructure. In **commercial buildings and data centers**, the KLK020S protects sensitive computer and networking equipment from power anomalies, reducing the risk of data loss and hardware damage. Additionally, it is well-suited for **telecommunications, HVAC systems, and renewable energy installations**, where stable power distribution is essential. **Why Choose Littelfuse for Protection Solutions?** Littelfuse is a globally recognized leader in circuit protection, with over a century of innovation and expertise in developing solutions that meet the demands of modern electrical systems. The company’s **current-limiting fuses** are engineered to the highest standards, offering **superior performance, durability, and safety compliance**. Professionals across industries rely on Littelfuse for products that deliver **predictable, repeatable protection**—even in the most challenging operating conditions. The KLK020S is no exception, providing a **cost-effective, low-maintenance solution** for applications where reliability cannot be compromised. **Installation and Selection Considerations** When selecting a fuse for a specific application, engineers and technicians must consider several factors, including **voltage rating, interrupting capacity, and response time**. The KLK020S is designed to operate efficiently within standard industrial voltage ranges, making it compatible with most control and lighting systems. Its **compact form factor** allows for easy integration into existing panels and enclosures, while its **high interrupting rating** ensures compatibility with modern electrical distribution networks that may experience higher fault currents. For optimal performance, professionals should adhere to **manufacturer guidelines** regarding mounting, spacing, and environmental conditions to maximize both safety and longevity. **Industry Compliance and Safety Standards** The KLK020S is manufactured in accordance with **international safety standards**, including UL, IEC, and other regional certifications, ensuring compliance with global electrical codes. This makes it a preferred choice for projects requiring **certified protection solutions** in regulated industries such as healthcare, manufacturing, and public infrastructure. By choosing a Littelfuse product, users gain access to a **trusted brand** with a proven track record of delivering **high-quality, compliant circuit protection** across diverse applications. **Conclusion: A Reliable Partner for Critical Protection Needs** In today’s fast-paced industrial landscape, where equipment reliability and operational continuity are non-negotiable, the **Littelfuse KLK020S** stands out as a **high-performance, dependable fuse solution**. Whether safeguarding control circuits, lighting systems, or sensitive electronics, this fuse provides the **speed, precision, and durability** required to maintain system integrity. With Littelfuse’s reputation for innovation and quality, professionals can trust the KLK020S to deliver **superior protection**—today and for years to come.
  • Fast-acting response minimizes equipment damage during overcurrent events
  • High interrupting capacity safely clears high fault currents
  • Ideal for control circuits, street lighting, H.I.D. lighting, and computers
  • Low inrush current compatibility prevents nuisance tripping
  • Compact design for easy integration into existing systems

Specifications

Application
control circuits
Brand Name
Littelfuse
Interrupt Rating
100;50 kA;kA
Series
KLK
Special Features
RoHS
Sub Brand
KLK Series
Type
Fast-Acting
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.