Littelfuse KLLU1800 - KLLU series UL Listed, time-delay, Class L are quality fuses in every sense of the word. They were developed to provide a somewhat lower priced alternate to the POWR-PRO™ KLPC series fuses. KLLU series fuses meet or exceed all UL requirements for Class L fuses. For superior protection and performance, specification-grade POWR-PRO™ KLPC series fuses are the recommended fuses.
Littelfuse

KLLU1800

Alternate Item Number: KLLU1800X

UPC: 079458271119


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Overview

The Littelfuse KLLU1800 is a robust and reliable UL Listed, time-delay Class L fuse engineered to provide essential circuit protection for demanding industrial applications. Developed by Littelfuse, a globally recognized leader in circuit protection, the KLLU series offers a high-quality, cost-effective alternative to premium fuse lines, without compromising on safety or performance standards. This specific model, the KLLU1800, is designed to meet or exceed all stringent UL requirements for Class L fuses, ensuring dependable operation and safeguarding valuable equipment from overcurrents and short circuits. As a time-delay fuse, the KLLU1800 is specifically designed to withstand temporary, harmless inrush currents commonly associated with motors and transformers. This characteristic prevents nuisance tripping, which can lead to costly downtime and production interruptions. However, it will swiftly and reliably interrupt fault currents, protecting your electrical systems from catastrophic damage. The 'Class L' designation signifies its suitability for high-amperage applications, typically found in power distribution panels, industrial machinery, and large motor control circuits. While the specification-grade POWR-PRO™ KLPC series from Littelfuse represents the pinnacle of fuse technology, the KLLU1800 provides an excellent balance of performance and affordability. This makes it an ideal choice for applications where budget considerations are important, but where robust protection and adherence to safety standards are non-negotiable. Professionals in electrical engineering, maintenance, and facility management will appreciate the consistent quality and reliable protection offered by the KLLU1800. Key benefits and features of the Littelfuse KLLU1800 include: * **UL Listed Compliance:** Meets or exceeds all UL requirements for Class L fuses, ensuring adherence to critical safety standards. * **Time-Delay Operation:** Effectively handles temporary inrush currents, minimizing nuisance tripping and maximizing operational uptime. * **Robust Industrial Protection:** Designed for high-amperage industrial environments, safeguarding critical equipment and electrical infrastructure. * **Cost-Effective Solution:** Offers a competitive price point as an alternative to premium fuse series, providing excellent value. * **Littelfuse Quality:** Backed by the reputation and expertise of Littelfuse, a trusted name in circuit protection for decades. Applications for the KLLU1800 are widespread across various industrial sectors, including manufacturing plants, data centers, commercial buildings, and any facility relying on heavy electrical loads. Its versatility makes it suitable for protecting: * Industrial motors and drives * Power distribution systems * Transformers * Switchgear and control panels * Heavy-duty machinery When selecting fuses for critical industrial applications, choosing a product that offers both reliable protection and economic efficiency is paramount. The Littelfuse KLLU1800 fulfills these requirements, providing peace of mind and ensuring the continued safe and efficient operation of your electrical systems. Trust Littelfuse for dependable circuit protection solutions.
  • UL Listed, Time-Delay, Class L Fuse
  • Cost-effective alternative to premium fuse series
  • Meets or exceeds all UL requirements for Class L fuses
  • Designed for industrial applications requiring robust protection
  • Reliable performance for motors, transformers, and power distribution

Specifications

Application
Service Switches/Switchboard Mains
Brand Name
Littelfuse
Current Rating
1800 A
Series
KLLU
Special Features
Time-Delay
Standard
248-10 UL Listed/CSA
Sub Brand
KLLU Series
Type
Class L
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.