Littelfuse KLLU1000 - 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

KLLU1000

Alternate Item Number: KLLU1000X

UPC: 079458271058


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BrochureTechnical BulletinTechnical DrawingSpecification Sheet

Contact for Pricing

Overview

The Littelfuse KLLU1000 series represents a cornerstone of reliable circuit protection for demanding industrial environments. As a UL Listed, time-delay, Class L fuse, the KLLU1000 is engineered to deliver consistent and dependable performance, safeguarding critical electrical systems from overcurrents and short circuits. Developed as a quality-driven, cost-effective alternative to premium-grade fuses, the KLLU series strikes an optimal balance between robust protection and economic viability. These fuses are meticulously designed to meet or exceed all stringent UL requirements specifically for Class L fuses. This adherence to rigorous standards ensures that the KLLU1000 provides a high level of safety and operational integrity, making it a trusted choice for a wide array of industrial applications. From power distribution panels to motor control circuits, the KLLU1000 offers essential protection that minimizes downtime and prevents costly equipment damage. While the KLLU series offers superior protection and performance at a competitive price point, Littelfuse also provides the specification-grade POWR-PRO™ KLPC series for applications where the absolute highest level of protection and performance is paramount. The KLLU1000, however, stands as an excellent choice for many standard industrial needs, delivering the reliability and peace of mind that comes with using Littelfuse products. Professionals can rely on the KLLU1000 for its predictable operation and its ability to withstand the rigors of industrial settings. Key features and benefits of the Littelfuse KLLU1000 include: * **UL Listed Class L Compliance:** Meets or exceeds all UL requirements for Class L fuses, ensuring safety and reliability. * **Time-Delay Operation:** Designed to allow for temporary inrush currents without nuisance tripping, crucial for motor starts and transformer loads. * **Cost-Effective Solution:** Provides high-quality protection at a more accessible price point compared to premium-grade alternatives. * **Durable Construction:** Built to withstand harsh industrial conditions, ensuring long-term operational integrity. * **Broad Application Use:** Suitable for a wide range of industrial power distribution and motor control applications. When specifying circuit protection, understanding the nuances of fuse types is critical. Time-delay fuses, like the KLLU1000, are essential for equipment that experiences brief, high current surges during startup. This characteristic prevents unnecessary interruptions to production while still offering robust protection against sustained overloads and dangerous short circuits. The Class L designation signifies specific performance characteristics and interrupting ratings vital for high-fault current applications. Littelfuse, a globally recognized leader in circuit protection, brings its extensive expertise and commitment to quality to the KLLU series, ensuring that each fuse is manufactured to the highest standards. Choosing the KLLU1000 means investing in dependable protection that supports the efficient and safe operation of your industrial infrastructure.
  • UL Listed Class L Time-Delay Fuse
  • Reliable Overcurrent and Short-Circuit Protection
  • Cost-Effective Alternative to Premium Fuses
  • Meets or Exceeds All UL Requirements for Class L
  • Ideal for Industrial Power Distribution and Motor Control

Specifications

Application
Service Switches/Switchboard Mains
Brand Name
Littelfuse
Series
KLLU
Special Features
Time-Delay
Standard
248-10 UL Listed/CSA
Sub Brand
KLLU Series
Type
Class L
Package Weight (Imperial)
4.030 L
Package Weight (Metric)
1.828 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

What technical support resources does Littelfuse offer?

Littelfuse offers a Techline with technical experts who can provide product cross references, technical information, engineering drawings, and application assistance. They can be contacted at 1-800-TEC-FUSE or [email protected].

How can distributors access Littelfuse product information?

Distributors can access product information through the Littelfuse Business Center website, which provides product availability, pricing, order placement, order status, special pricing agreements, literature ordering, and technical resources.

What marketing support does Littelfuse provide to distributors?

Littelfuse offers a Marketing to Marketing program that includes co-branded email campaigns, content sharing, marketing tools, product launch support, and website linking. The program is free and aims to help distributors grow sales.

What training resources are available from Littelfuse?

Littelfuse University (LFU) provides in-depth training courses ranging from 3 to 20 minutes, covering products, programs, and tools at various skill levels. Courses can be accessed at LittelfuseUniversity.com.

What digital marketing assets does Littelfuse provide?

Littelfuse offers a digital asset portal with online sales tools, product images, video files, sales presentations, webcast recordings, and product literature that can be downloaded and used by distributors.

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.