Littelfuse KLPC4000 - KLPC series POWR-PRO™ fuses provide ideal overcurrent protection for circuits from 200 through 6000 amperes. KLPC series POWR-PRO™ fuses specification-grade construction and performance meet or exceed the most stringent project specifications: 99.9% pure silver links, silver-plated copper end bells, glass-reinforced melamine bodies, O-ring seals between body and end bells, and granular quartz fillers. KLPC series POWR-PRO™ fuses are the only UL listed Class L fuses that provide a minimum of ten seconds time delay at 500% rated current and are also as current limiting as the fastest Class L fuse on the market. On average, the peak let-through currents of KLPC series fuses are 10% less than any other "time-delay" Class L fuse.
Littelfuse

KLPC4000

Alternate Item Number: KLPC4000X

UPC: 079458301168

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Overview

The Littelfuse KLPC4000 POWR-PRO™ Class L fuse (SKU: KLPC4000) delivers superior overcurrent protection for industrial and commercial circuits rated from 200 to 6000 amperes. Engineered with specification-grade construction, these UL-listed Class L fuses meet or exceed stringent project requirements. The fuse features 99.9% pure silver links for optimal conductivity, silver-plated copper end bells for corrosion resistance, and glass-reinforced melamine bodies for exceptional mechanical strength and arc resistance. O-ring seals prevent moisture ingress, while granular quartz fillers provide effective arc quenching and thermal stability, ensuring consistent performance in demanding conditions. The KLPC4000 is the only UL-listed Class L fuse offering a minimum of ten seconds time delay at 500% rated current, effectively managing inrush currents from motor starts or transformers without nuisance tripping. Its current-limiting capability rivals the fastest Class L fuses, with peak let-through currents averaging 10% lower than other time-delay Class L fuses. This significantly reduces stress on downstream equipment, enhancing system safety and protecting sensitive components in switchgear, motor control centers, and power distribution panels. Typical applications include industrial power distribution in manufacturing and processing plants, high-amperage services in commercial buildings like data centers and hospitals, utility and renewable energy systems, and heavy machinery with large motors. The KLPC4000 is designed for reliability in critical infrastructure, ensuring uptime and compliance with industry standards.
  • UL-listed Class L fuse with 200-6000A current rating
  • 10-second time delay at 500% rated current for inrush handling
  • 99.9% pure silver links and silver-plated copper end bells for conductivity and corrosion resistance
  • Glass-reinforced melamine body with O-ring seals and granular quartz fillers for arc quenching and thermal stability
  • Peak let-through currents 10% lower than comparable time-delay Class L fuses
  • 10% lower peak let-through currents than competing time-delay Class L fuses
  • UL-listed Class L fuse with current-limiting capabilities rivaling the fastest in the market
  • Ideal for industrial, commercial, and utility power distribution systems
  • Drop-in replacement for lower-performance fuses with enhanced protection

Specifications

Amperage Rating
2.25 Amp
Application
small motors/high inrush
Brand Name
Littelfuse
Current Rating
200-6000 A
Current Rating
4000 A
Material
99.9% pure silver links, silver-plated copper end bells, glass-reinforced melamine bodies, granular quartz fillers
Nema Rating
Class L
Series
KLPC
Special Features
Time-Delay
Standard
Supplemental Protection
Sub Brand
POWR-GARD FLM Series
Type
UL Supplemental

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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.