Littelfuse LFH25030-2S - 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

LFH25030-2S

Alternate Item Number: LFH250302S

UPC: 079458181333

Documents & Media
BrochureSpecification Sheet

Contact for Pricing

Overview

The **Littelfuse Class H Fuse Block LFH25030-2S** is a high-performance industrial-grade solution engineered for robust circuit protection in demanding environments. Designed to meet the rigorous standards of modern industrial applications, this fuse block delivers unmatched reliability, durability, and safety. As part of Littelfuse’s latest Class H fuse block generation, the LFH25030-2S offers significant advantages over previous models, including improved compatibility, enhanced thermal performance, and superior fault interruption capabilities. This ensures optimal protection for critical electrical systems while minimizing downtime and maintenance costs. **Key Features and Benefits:** The LFH25030-2S is dimensionally identical to Class R fuse blocks, providing flexibility in system design and retrofitting. However, it incorporates a **rejection feature** that restricts insertion to Class H fuses only, preventing the accidental use of incompatible fuse types. This critical safety mechanism reduces the risk of misapplication, which can lead to equipment damage, electrical fires, or system failures. Professionals in industries such as manufacturing, power distribution, renewable energy, and heavy machinery rely on Littelfuse’s Class H fuse blocks to safeguard sensitive and high-power circuits. **Industrial Applications and Use Cases:** The LFH25030-2S is ideal for a wide range of industrial applications, including motor control centers, panelboards, switchgear, and distribution boards. It is particularly well-suited for environments where **high fault currents** and **harsh operating conditions** are common, such as: - **Manufacturing plants** (automotive, food processing, textiles) - **Power generation and distribution** (substations, utility grids) - **Renewable energy systems** (solar inverters, wind turbine controllers) - **Oil and gas facilities** (explosion-proof environments) - **Mining and construction equipment** (heavy-duty machinery) Its **compact design** and **easy installation** make it a preferred choice for both new installations and system upgrades. The fuse block’s **durable construction** ensures long-term performance, even in corrosive or vibration-prone settings, while its **high interrupting rating** provides reliable protection against short circuits and overloads. **Why Choose Littelfuse for Class H Fuse Blocks?** Littelfuse is a globally recognized leader in circuit protection solutions, with over a century of innovation and expertise. The company’s Class H fuse blocks, including the **LFH25030-2S**, are trusted by engineers and maintenance professionals for their **consistent performance, compliance with industry standards (UL, CSA, IEC)**, and **backward compatibility** with existing systems. Unlike generic alternatives, Littelfuse’s products undergo rigorous testing to ensure they meet the demands of real-world industrial applications. **Installation and Maintenance Considerations:** Proper installation of the LFH25030-2S is critical to maximizing its protective capabilities. Professionals should ensure: - **Correct fuse sizing** (Class H fuses only, per the rejection feature) - **Secure mounting** to prevent vibration-induced loosening - **Adequate clearance** for heat dissipation and maintenance access - **Compliance with local electrical codes** (NEC, OSHA, etc.) Routine inspections should include checking for **corrosion, loose connections, or signs of overheating**, as these can compromise performance. Littelfuse provides comprehensive technical documentation, including **datasheets, installation guides, and application notes**, to support end-users in achieving optimal results. **Conclusion:** For industrial professionals seeking a **reliable, high-performance Class H fuse block**, the **Littelfuse LFH25030-2S** is a proven solution that delivers safety, durability, and peace of mind. Whether upgrading existing systems or designing new installations, this fuse block ensures compliance with critical protection standards while minimizing operational risks. Trust Littelfuse’s legacy of innovation to safeguard your most demanding electrical applications.
  • Dimensional compatibility with Class R fuse blocks for flexible system design
  • Rejection feature ensures only Class H fuses can be inserted, preventing misapplication
  • High interrupting rating for superior short-circuit and overload protection
  • Durable construction for harsh industrial environments (vibration, corrosion, heat)
  • Trusted Littelfuse quality with UL, CSA, and IEC compliance

Specifications

Brand Name
Littelfuse
Special Features
Universal mounting holes
Standard
UL Listed CSA Recognized
Sub Brand
LF Series Fuseblock
Type
Class H Fuseblock
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
BB18 is a three-phase busbar terminal power feed lug, which is intended for use with LPSM/LPSC series fuse holders. See datasheet for more detailed specifications.

BB18

BB18 is a three-phase busbar terminal power feed lug, which is intended for use with LPSM/LPSC series fuse holders. See datasheet for more detailed specifications.
D4/8.SFT2.I.ADO

1SNA399777R1200

D4/8.SFT2.I.ADO
2000W 5V 150A 24V 10A 2-12V 1P

SH20-P3T53J4

2000W 5V 150A 24V 10A 2-12V 1P

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.