Littelfuse KLK003S - 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

KLK003S

Alternate Item Number: 0KLK003.TS

UPC: 079458189643

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Overview

The **Littelfuse KLK003S** is a high-performance, fast-acting, current-limiting fuse engineered for precision protection in industrial and commercial applications where low inrush currents are present. Designed for reliability and durability, this fuse is part of Littelfuse’s trusted KLK series, a line renowned for its superior interrupting capacity and fast response times. Whether protecting control circuits, street lighting systems, high-intensity discharge (H.I.D.) lighting, or sensitive computer equipment, the KLK003S delivers consistent performance in demanding environments where electrical faults must be mitigated swiftly to prevent equipment damage or downtime. **Key Features and Benefits:** - **Fast-Acting Response:** The KLK003S is optimized for applications without high inrush currents, ensuring rapid interruption of overcurrent conditions to safeguard sensitive electronics and control systems. Its fast-acting nature minimizes the risk of thermal stress and component failure, making it ideal for protecting low-surge applications. - **High Interrupting Capacity:** With an exceptional interrupting rating, this fuse can safely handle fault currents that exceed standard ratings, providing robust protection against short circuits and overloads. This makes it particularly suitable for industrial control panels, lighting circuits, and other critical systems where reliability is paramount. - **Current-Limiting Design:** The KLK003S limits fault current to a fraction of its prospective value, reducing the energy let-through during a fault event. This feature is crucial for protecting downstream components from catastrophic failure, ensuring operational continuity and reducing maintenance costs. - **Versatile Applications:** From **control circuits** in automation systems to **street lighting networks** and **H.I.D. lighting fixtures**, the KLK003S is a versatile solution for a wide range of low-inrush applications. It is also well-suited for **computer power supplies, telecom systems, and HVAC controls**, where consistent and reliable circuit protection is essential. - **Durable and Long-Lasting:** Manufactured by Littelfuse, a global leader in circuit protection solutions, the KLK003S is built to withstand harsh operating conditions, including temperature fluctuations, vibration, and electrical stress. Its robust construction ensures a long service life, reducing the need for frequent replacements and lowering total cost of ownership. **Why Choose Littelfuse KLK Series Fuses?** Littelfuse has been a pioneer in circuit protection for over a century, earning a reputation for innovation, quality, and reliability. The KLK series, including the KLK003S, is a testament to this legacy, offering engineers and technicians a dependable solution for protecting critical infrastructure. Professionals in industries such as **manufacturing, energy, telecommunications, and commercial lighting** rely on Littelfuse fuses to ensure system integrity and compliance with safety standards. **Installation and Selection Considerations:** When selecting a fuse for low-inrush applications, it’s essential to consider the **interrupting rating, response time, and environmental conditions**. The KLK003S is designed to meet these requirements, but proper sizing and installation are critical for optimal performance. Engineers should consult the **Littelfuse product datasheet** for specific electrical ratings, such as voltage and current, to ensure compatibility with their system. Additionally, the fuse should be installed in a location that allows for easy inspection and replacement, as part of a comprehensive maintenance program. **Industry Applications:** - **Control Circuits:** Protects PLCs, relays, and motor starters from overcurrent events. - **Street Lighting:** Ensures reliable operation of LED or H.I.D. fixtures in outdoor environments. - **Commercial Lighting:** Ideal for retail, office, and warehouse lighting systems where low inrush is common. - **Computer and Telecom Systems:** Safeguards power supplies and sensitive electronics from transient faults. - **HVAC Systems:** Provides protection for control boards and motors in heating and cooling systems. For engineers and technicians seeking a **fast-acting, high-interrupting capacity fuse** that delivers reliability and precision, the **Littelfuse KLK003S** is a trusted choice. Its combination of performance, durability, and versatility makes it an essential component in modern electrical protection strategies.
  • Fast-acting response for low-inrush applications
  • High interrupting capacity for superior fault protection
  • Current-limiting design reduces energy let-through
  • Versatile use in control circuits, lighting, and computer systems
  • Durable construction for long service life

Specifications

Application
control circuits
Brand Name
Littelfuse
Interrupt Rating
100;50 kA;kA
Manufacturer
Littelfuse
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 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.