Littelfuse KLLU1400 - 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

KLLU1400

Alternate Item Number: KLLU1400X

UPC: 079458271072


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Overview

The Littelfuse KLLU1400 represents a robust and reliable solution for industrial electrical protection, specifically designed as a UL Listed, time-delay Class L fuse. Engineered by Littelfuse, a globally recognized leader in circuit protection, the KLLU series offers a compelling balance of performance and value, serving as a cost-effective alternative to their premium POWR-PRO™ KLPC series fuses. This dedication to quality ensures that the KLLU1400 meets or exceeds all stringent UL requirements for Class L fuses, providing peace of mind for critical industrial applications. At its core, the KLLU1400 is built to deliver superior protection against overcurrents and short circuits. Its time-delay characteristic is crucial for industrial settings where temporary, harmless inrush currents are common, such as during motor startup or transformer energization. This feature prevents nuisance tripping, thereby maintaining operational continuity and reducing downtime. Conversely, in the event of a genuine fault, the fuse will reliably interrupt the circuit, safeguarding sensitive equipment and personnel from damage and hazards. The Class L designation signifies its high interrupting rating, making it suitable for heavy-duty industrial power distribution systems. Industries that rely on dependable power infrastructure will find the KLLU1400 to be an indispensable component. Typical applications include motor control centers, large machinery, power distribution panels, and any system where robust overcurrent protection is paramount. The Littelfuse KLLU1400 is engineered for durability and consistent performance in demanding environments, where factors like temperature fluctuations, vibration, and electrical stress are commonplace. Choosing the KLLU1400 means investing in a fuse that not only complies with industry standards but also contributes to the overall safety and efficiency of your electrical systems. While the specification-grade POWR-PRO™ KLPC series remains the recommended choice for applications demanding the absolute highest levels of performance and protection, the KLLU1400 series provides a highly capable and economically sensible option for a wide array of industrial needs. Professionals can confidently specify the KLLU1400 for its proven reliability, adherence to UL standards, and the trusted reputation of the Littelfuse brand. Its design prioritizes both effective fault interruption and operational stability, making it a smart choice for maintaining the integrity of industrial electrical infrastructure. Key benefits of the Littelfuse KLLU1400 include: * **UL Listed Class L Compliance:** Ensures adherence to rigorous safety and performance standards for industrial fuses. * **Time-Delay Operation:** Effectively handles temporary inrush currents, minimizing nuisance tripping and maximizing uptime. * **Cost-Effective Alternative:** Provides reliable protection at a more accessible price point compared to premium series. * **Robust Industrial Protection:** Designed to safeguard critical equipment and personnel from overcurrents and short circuits. * **Trusted Littelfuse Quality:** Backed by the reputation of a leading manufacturer in circuit protection.
  • UL Listed Class L time-delay fuse for industrial applications
  • Cost-effective alternative to premium POWR-PRO™ KLPC series
  • Meets or exceeds all UL requirements for Class L fuses
  • Provides reliable protection against overcurrents and short circuits
  • Engineered for superior performance and durability in demanding environments

Specifications

Application
Service Switches/Switchboard Mains
Brand Name
Littelfuse
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.