Littelfuse LFR25060-3CID - The new Littelfuse Class H and R blocks offer many advantages over previous generations that are noted in the features and benefits section. Class H and Class R fuse blocks are dimensionally the same, but Class R blocks incorporate a rejection feature, which only allows Class R fuses to be inserted.
Littelfuse

LFR25060-3CID

Alternate Item Number: LFR250603CID

UPC: 079458181678

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Overview

The Littelfuse Class H and R fuse blocks (SKU: LFR25060-3CID) represent a significant advancement in industrial fuse protection, combining compatibility with Class H and R fuses in a single, dimensionally identical design. These fuse blocks are engineered to meet the stringent demands of modern industrial applications, where safety, reliability, and compliance with industry standards are non-negotiable. Class H and Class R fuse blocks share the same footprint, simplifying inventory management and system design while ensuring seamless integration into existing electrical panels. However, Class R blocks incorporate a critical rejection feature—a mechanical interlock that physically prevents the insertion of Class H fuses, enforcing compliance with Class R fuse requirements. This design innovation is particularly valuable in applications where misapplication of fuses could lead to catastrophic equipment failure, fire hazards, or non-compliance with safety regulations. Industrial professionals rely on Littelfuse for its reputation as a leader in circuit protection, and the LFR25060-3CID fuse blocks exemplify this commitment. These blocks are ideal for a wide range of applications, including industrial control panels, motor circuits, power distribution systems, and renewable energy installations. Their robust construction ensures long-lasting durability, even in harsh environments with high vibration, temperature fluctuations, or exposure to contaminants. The Class R rejection feature is especially critical in motor circuits and branch feeder applications, where Class R fuses provide superior current-limiting performance, reducing the let-through energy during fault conditions and minimizing the risk of equipment damage. Selecting the right fuse block for an application requires careful consideration of several factors, including the type of fuses used, the required interrupting rating, and the specific safety standards that must be met. The LFR25060-3CID is designed to support both Class H and Class R fuses, offering flexibility for engineers who need to balance cost, performance, and compliance. Class H fuses, while still widely used, are gradually being replaced by Class R fuses in many applications due to their enhanced safety and performance characteristics. Class R fuses are tested and certified to meet UL 248 standards for current-limiting fuses, providing superior protection against short circuits and overloads. The rejection feature in Class R fuse blocks ensures that only Class R fuses can be installed, eliminating the risk of misapplication and ensuring that the system operates as intended. Installation of the Littelfuse LFR25060-3CID fuse blocks is straightforward, with a design that accommodates standard mounting configurations. The blocks are typically mounted on DIN rails or directly onto panel surfaces, depending on the specific requirements of the installation. Proper installation is critical to ensuring optimal performance and safety, and Littelfuse provides comprehensive documentation, including wiring diagrams and installation instructions, to guide professionals through the process. The blocks are designed to handle high current ratings, making them suitable for demanding applications such as motor starters, transformers, and power distribution units. Their compact design also allows for efficient use of panel space, which is a valuable consideration in modern electrical enclosures where space is often at a premium. Littelfuse’s Class H and R fuse blocks are backed by decades of expertise in circuit protection, with a global reputation for quality and reliability. The company’s products are trusted by professionals in industries ranging from manufacturing and energy to transportation and infrastructure, where downtime and equipment failure are not acceptable. By choosing the LFR25060-3CID, engineers and technicians can be confident that they are investing in a product that meets the highest standards of safety and performance. Whether upgrading existing systems or designing new installations, the Littelfuse Class H and R fuse blocks provide a reliable, cost-effective solution for protecting critical electrical infrastructure.
  • Dual compatibility with Class H and Class R fuses in a single design
  • Class R rejection feature prevents misapplication of fuses
  • Robust construction for durability in harsh industrial environments
  • Ideal for motor circuits, control panels, and power distribution systems
  • Meets UL 248 standards for current-limiting fuse protection

Specifications

Brand Name
Littelfuse
Mounting Type
DIN rail or panel surface
Series
Class H and R fuse blocks
Series
LFR25060
Special Features
Universal mounting holes
Standard
UL Listed and CSA Certified RoHS
Sub Brand
LFR Series
Type
Fuse Block
All Littelfuse Class G fuse blocks offer snap-to-release DIN rail mounting and universal mounting holes. Class G fuse blocks are designed for use with time-delay current limiting Class G fuses.

LFG48060-3CDINR

All Littelfuse Class G fuse blocks offer snap-to-release DIN rail mounting and universal mounting holes. Class G fuse blocks are designed for use with time-delay current limiting Class G fuses.
The Mersen FBC60J100 is a Generation 2 open-style Class J fuse block designed to accommodate Class J fuses from 0-100A at 600V. This model offers versatile connection options, including screw, pressure plate, and box connectors, compatible with a wide range of stranded or solid wire. Engineered for modern industrial applications, these Gen2 fuse blocks feature a more compact design compared to traditional offerings and are DIN-rail mountable for efficient panel assembly. The dovetail nesting capability allows for easy multipole field assembly, simplifying configuration. When paired with Mersen’s newly designed dead front covers, the fuse bases achieve an IP20 rating, enhancing safety. Manufactured in the USA, the FBC60J100 (SKU: FBC60J100) provides reliable fuse protection and connection for electrical systems.

FBC60J100

The Mersen FBC60J100 is a Generation 2 open-style Class J fuse block designed to accommodate Class J fuses from 0-100A at 600V. This model offers versatile connection options, including screw, pressure plate, and box connectors, compatible with a wide range of stranded or solid wire. Engineered for modern industrial applications, these Gen2 fuse blocks feature a more compact design compared to traditional offerings and are DIN-rail mountable for efficient panel assembly. The dovetail nesting capability allows for easy multipole field assembly, simplifying configuration. When paired with Mersen’s newly designed dead front covers, the fuse bases achieve an IP20 rating, enhancing safety. Manufactured in the USA, the FBC60J100 (SKU: FBC60J100) provides reliable fuse protection and connection for electrical systems.
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1SNA399777R1200

D4/8.SFT2.I.ADO

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.