Littelfuse KLPC350 - 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

KLPC350

Alternate Item Number: KLPC350.X

UPC: 079458295085

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Overview

The Littelfuse KLPC350 POWR-PRO™ Class L fuse represents the pinnacle of industrial overcurrent protection, engineered to safeguard critical electrical systems across a broad current range of 200 to 6000 amperes. This specification-grade fuse is meticulously constructed to meet and exceed the most demanding project requirements, making it an indispensable component for high-reliability applications. At its core, the KLPC series features 99.9% pure silver links, renowned for their superior conductivity and consistent performance. These are complemented by robust silver-plated copper end bells, ensuring excellent electrical contact and resistance to corrosion. The fuse body is constructed from durable, glass-reinforced melamine, providing exceptional mechanical strength and thermal stability even under strenuous operating conditions. Distinguishing itself in the market, the Littelfuse KLPC series is the only UL-listed Class L fuse offering a minimum ten-second time delay at 500% of its rated current. This critical feature allows for the accommodation of temporary inrush currents common in motor starts and other inductive loads, thereby preventing nuisance tripping and ensuring operational continuity. Simultaneously, these fuses deliver exceptional current-limiting capabilities, rivaling the performance of the fastest Class L fuses available. On average, the KLPC series fuses exhibit peak let-through currents that are approximately 10% lower than competing time-delay Class L fuses, significantly enhancing the protection of downstream equipment from damaging transient overcurrents. Further enhancing its reliability and longevity, the KLPC350 incorporates O-ring seals between the body and end bells, providing a robust barrier against environmental contaminants such as dust and moisture. The interior is packed with granular quartz fillers, which serve to absorb the energy released during a fault event, quenching arcs rapidly and safely. This comprehensive design ensures that the KLPC series fuses perform optimally and reliably in challenging industrial environments. Key features and benefits of the Littelfuse KLPC350 POWR-PRO™ Class L fuse include: * **Broad Current Range:** Ideal for circuits from 200A to 6000A. * **Premium Construction:** Utilizes 99.9% pure silver links, silver-plated copper end bells, and glass-reinforced melamine bodies for superior durability and conductivity. * **Unique Time-Delay Performance:** The only UL-listed Class L fuse with a minimum 10-second time delay at 500% rated current, preventing nuisance tripping. * **Superior Current Limiting:** Offers current-limiting capabilities comparable to the fastest Class L fuses, with average peak let-through currents 10% lower than competing time-delay fuses. * **Enhanced Durability:** Features O-ring seals and granular quartz fillers for increased protection against environmental factors and improved arc quenching. * **UL Listing:** Provides assurance of quality, safety, and compliance with industry standards. Applications for the Littelfuse KLPC350 POWR-PRO™ fuse are extensive, including motor control centers, switchgear, transformers, and main service protection in industrial facilities, manufacturing plants, data centers, and other critical infrastructure where reliable and robust overcurrent protection is paramount. Choosing Littelfuse KLPC series fuses means investing in unparalleled protection, operational efficiency, and equipment longevity.
  • Littelfuse KLPC350 POWR-PRO™ Class L fuse for industrial overcurrent protection.
  • Wide current rating range from 200 to 6000 amperes.
  • Constructed with 99.9% pure silver links and silver-plated copper end bells for optimal conductivity.
  • Unique UL-listed Class L fuse with a minimum 10-second time delay at 500% rated current.
  • Exceptional current-limiting performance, reducing peak let-through currents by an average of 10%.

Specifications

Amperage Rating
350 Amp
Application
Switchboard Mains
Brand Name
Littelfuse
Special Features
Current-limiting
Standard
Standard 248-10 UL Listed/CSA
Sub Brand
POWR-PRO
Type
Time-Delay
Package Weight (Imperial)
3.700 L
Package Weight (Metric)
1.678 kg
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.