Littelfuse KLKD.300H - The KLKD fuse series is fast-acting with a high DC voltage rating. This family of Midget style fuses (10 x 38 mm) is used in solar combiner boxes and in circuits with DC fault currents up to 50,000 amperes. KLKD fuses are available in standard and board-mount configurations. In addition, the KLKD series has been designed to meet both the UL and IEC photovoltaic fuse standards. Littelfuse offers a wide range of ampere ratings to match specific requirements in a variety of applications.
Littelfuse

KLKD.300H

Alternate Item Number: KLKD.300H

UPC: 079458964462

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Overview

The Littelfuse KLKD.300H is a high-performance, fast-acting Midget-style fuse engineered for critical DC circuit protection, particularly in demanding solar photovoltaic (PV) and industrial applications. Designed to meet stringent UL and IEC photovoltaic fuse standards, this fuse series offers exceptional reliability and safety where DC fault currents can reach up to 50,000 amperes. Its compact 10x38 mm form factor makes it suitable for integration into space-constrained environments such as solar combiner boxes, inverters, and other high-power DC systems. The KLKD series is distinguished by its high DC voltage rating, ensuring robust protection against overcurrents and short circuits in systems operating at elevated DC potentials. This is crucial for the integrity and longevity of solar arrays and other DC power infrastructure. Littelfuse, a globally recognized leader in circuit protection, has meticulously designed the KLKD.300H to deliver consistent and dependable performance, even under severe fault conditions. This commitment to quality ensures that critical equipment is shielded from damage, minimizing downtime and costly repairs. Key features and benefits of the Littelfuse KLKD.300H fuse include: * **Fast-Acting Protection:** Rapidly interrupts fault currents to prevent damage to sensitive equipment. * **High DC Fault Current Rating:** Capable of safely interrupting up to 50,000 amperes DC, providing superior protection in high-power DC circuits. * **High DC Voltage Rating:** Engineered for applications with significant DC voltage levels, common in solar and industrial power systems. * **UL and IEC PV Compliance:** Meets rigorous international standards for photovoltaic fuse applications, ensuring safety and interoperability. * **10x38 mm Midget Style:** Compact form factor ideal for solar combiner boxes, inverters, and other space-limited installations. * **Versatile Configurations:** Available in both standard and board-mount options to accommodate diverse design requirements. * **Wide Ampere Range:** Littelfuse offers a comprehensive selection of ampere ratings within the KLKD series, allowing for precise application matching and optimized circuit protection. Professionals in the solar energy sector, industrial automation, and power electronics rely on Littelfuse products for their proven performance and adherence to industry-leading safety standards. The KLKD.300H fuse exemplifies this commitment, offering peace of mind and robust protection for critical DC power systems. Whether you are designing new solar installations or upgrading existing DC power infrastructure, the Littelfuse KLKD.300H provides the advanced protection necessary to safeguard your investments and ensure operational continuity. Its availability in various ampere ratings ensures that engineers can select the precise fuse to match their specific application's current requirements, further enhancing system efficiency and safety.
  • Fast-acting interruption for critical DC circuit protection
  • High DC voltage rating suitable for solar and industrial applications
  • 50,000A DC fault current interruption capacity
  • 10x38mm Midget style, compliant with UL and IEC photovoltaic fuse standards
  • Available in standard and board-mount configurations with a wide range of ampere ratings

Specifications

Application
Power supplies
Brand Name
Littelfuse
Mounting Type
Standard and board-mount
Series
KLKD
Size
10 x 38 mm
Special Features
Fast Acting Fuses
Standard
UL Listed/CSA Certified
Sub Brand
KLKD Series
Type
10x38 Fuses

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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.