Littelfuse LFH25100-1CID - The new Littelfuse Class H 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

LFH25100-1CID

Alternate Item Number: LFH251001CID

UPC: 079458181234

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Overview

The Littelfuse LFH25100-1CID Class H Fuse Block (SKU: LFH25100-1CID) delivers robust, high-performance circuit protection for industrial and commercial applications where reliability and durability are critical. Designed to meet the stringent demands of modern electrical systems, this Class H fuse block provides a cost-effective solution for overcurrent protection, ensuring the safety and efficiency of critical infrastructure. Engineered with Littelfuse’s decades of expertise in circuit protection, the LFH25100-1CID is a trusted choice for engineers, electricians, and facility managers seeking dependable performance in harsh operating conditions. Class H fuse blocks are dimensionally compatible with Class R fuse blocks, offering a seamless upgrade path for facilities transitioning from older Class H systems to more advanced protection standards. While Class R blocks incorporate a rejection feature to prevent the insertion of non-compliant fuses, the LFH25100-1CID is purpose-built for Class H fuses, providing precise fault interruption and thermal stability. This ensures consistent performance in applications where electrical faults could lead to equipment damage, downtime, or safety hazards. **Key Applications and Industries:** The LFH25100-1CID is ideal for a wide range of industrial and commercial environments, including: - **Manufacturing plants** and production facilities where machinery protection is essential to prevent costly downtime. - **Commercial buildings** and data centers requiring reliable power distribution and fault isolation. - **Renewable energy systems**, such as solar and wind power installations, where overcurrent protection is critical for grid stability. - **Oil and gas facilities**, chemical plants, and other hazardous locations where electrical safety is paramount. - **HVAC systems** and motor control centers in large-scale facilities, ensuring compliance with electrical codes and reducing fire risks. **Engineering and Installation Benefits:** The LFH25100-1CID is designed for ease of installation and long-term reliability. Its robust construction resists corrosion, vibration, and thermal stress, making it suitable for both indoor and outdoor applications. The fuse block’s compact footprint allows for efficient space utilization in control panels, while its standardized mounting ensures compatibility with existing infrastructure. Professionals appreciate the LFH25100-1CID for its: - **High interrupting rating**, providing superior protection against short circuits and overloads. - **Compatibility with industry-standard Class H fuses**, offering flexibility in fuse selection and replacement. - **Durable materials** that withstand harsh environmental conditions, including temperature extremes and humidity. - **Compliance with UL and other safety standards**, ensuring peace of mind in regulated industries. Littelfuse, a global leader in circuit protection solutions, has built a reputation for innovation and reliability since its founding in 1927. The company’s Class H fuse blocks, including the LFH25100-1CID, are trusted by professionals worldwide for their precision engineering and adherence to stringent quality controls. Whether upgrading legacy systems or designing new installations, engineers and technicians rely on Littelfuse for solutions that balance performance, safety, and cost-effectiveness. For facilities where electrical safety and operational continuity are non-negotiable, the Littelfuse LFH25100-1CID Class H Fuse Block is the smart choice. Its combination of proven technology, rugged construction, and manufacturer-backed reliability makes it an essential component in any robust electrical protection strategy.
  • Compatible with Class H fuses for precise overcurrent protection
  • Dimensionally identical to Class R blocks for easy upgrades
  • Robust construction for harsh industrial environments
  • High interrupting rating for superior fault protection
  • Trusted Littelfuse quality with decades of circuit protection expertise

Specifications

Brand Name
Littelfuse
Material
Durable materials (corrosion/thermal/vibration resistant)
Mounting Type
Standardized mounting for control panels
Series
Class H fuse block
Special Features
Universal mounting holes
Standard
UL Listed CSA Recognized
Sub Brand
LF Series Fuseblock
Type
Class H Fuseblock
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ACS 3AG MTG 9 POLE. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.
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ACS 3AG OMNI-BLOK SLDR TERM 9 POLE MTG. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.

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ACS 3AG OMNI-BLOK SLDR TERM 9 POLE MTG. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.
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ACS 3AG MTG 12 POLE. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.

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ACS 3AG MTG 4 POLE. A low profile fuse block featuring individual barriers which reinforce the fuse clips while providing greater protection against clip damage and electrical shock. The unique design permits self-alignment of clips to fuse cap. This, plus a one-piece clip/terminal assures low contact resistance. Higher current ratings have been attained using spring brass clips. With the exception of the two-pole unit, multiple pole units may be broken apart to obtain desired number of poles.

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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.