Littelfuse LRU-2642 - Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse

LRU-2642

Alternate Item Number: LRU2642

UPC: 079458114058


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Overview

The Littelfuse LRU-2642 fuse reducer (SKU: LRU-2642) is a precision-engineered component designed to prevent overfusing by allowing smaller-sized fuses to be installed into existing fuse clips. This critical adapter ensures that circuits are protected with the correct amperage rating, safeguarding sensitive electronic components and preventing costly equipment damage and downtime. Engineered for compatibility with standard fuse holders, the LRU-2642 facilitates the installation of fuses such as 5x20mm, 6x32mm, or ¼-inch diameter fuses into clips originally intended for larger fuse sizes. Key features include a snap-in mounting type for tool-free installation and a design that fits 1/4" diameter fuses. This makes it an ideal solution for retrofitting outdated systems, upgrading circuit protection during equipment modifications, and ensuring compliance with updated electrical codes. The LRU-2642 is manufactured in the USA, meeting stringent safety standards including UL and IEC certifications, ensuring reliability and performance in demanding operational conditions. Its durable construction resists vibration, temperature extremes, and corrosive environments, making it suitable for industrial, commercial, and automotive applications such as power distribution panels, motor control centers, and equipment protection systems. Compared to the expense and time involved in replacing entire fuse blocks, the Littelfuse LRU-2642 offers a cost-effective and efficient alternative for precise overcurrent protection. It is a vital component in preventative maintenance programs, helping electrical engineers and maintenance professionals extend the lifespan of electrical equipment while minimizing operational risks. The low-profile design ensures compatibility with adjacent components, simplifying integration into existing setups.
  • Allows smaller fuses (e.g., 1/4" diameter) to fit into existing fuse clips.
  • Prevents overfusing, protecting sensitive electronic components and equipment.
  • Snap-in mounting type for tool-free installation.
  • Ideal for industrial, commercial, and automotive applications.
  • Manufactured in the USA with UL and IEC certifications.

Specifications

Application
Industrial
Brand Name
Littelfuse
Series
LRU-2642
Special Features
Simple Installation
Standard
UL Listed CSA Certified
Sub Brand
LRUR Series
Type
Fuse Reducer
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-2661R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-626R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRUJ13

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-2621

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-663

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-263R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-263

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.

LRU-616R

For use with Littelfuse FLNR_ID/FLSR_ID, IDSR, LLNRK/LLSRK and KLNR/KLSR series fuses.
Box cover units provide an economical method of protecting small motors against overcurrent damage. For use with Edison-Base plug fuses (TOO, TLO) or Type S plug fuses (SOO, SLO) with adapters (SAO).

LSCY

Box cover units provide an economical method of protecting small motors against overcurrent damage. For use with Edison-Base plug fuses (TOO, TLO) or Type S plug fuses (SOO, SLO) with adapters (SAO).
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-213

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-616

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.
Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

LRU-626

Littelfuse® fuse reducers allow smaller size fuses to be installed into existing fuse clips to prevent overfusing.

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.