Littelfuse H273005 - VERY FAST ACTING MICRO H-PACK 5A. Developed originally for the U.S. Space Program, MICRO™ fuse provides reliability in a compact design. The MICRO™ fuse is available in plug–in or radial lead styles and a complete range of ampere ratings from 1/500 to 5A to suit a wide variety of design needs. Features: Military grade available. High breaking capacity. Clear cover option to view fuse element status. Available from very low ampere of 2mA to 5A Plug-in with short or long leads option.
Littelfuse

H273005

Alternate Item Number: 0273005.H

UPC: 079458873078

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Minimum Qty: 100

Multiplier: 100

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Overview

The Littelfuse MICRO™ H-PACK 5A fuse (SKU: H273005) represents a pinnacle of high-performance fuse technology, originally engineered for the rigorous demands of the U.S. Space Program. This very fast-acting fuse delivers uncompromising reliability in a compact, space-efficient design, making it an ideal choice for mission-critical applications across aerospace, defense, industrial electronics, and high-reliability power systems. As part of Littelfuse’s esteemed MICRO™ series, this fuse combines decades of proven performance with cutting-edge materials and manufacturing processes to ensure consistent protection in the most demanding environments. Designed for versatility, the MICRO™ H-PACK 5A fuse is available in both plug-in and radial lead configurations, offering engineers flexibility in circuit design and installation. The plug-in variant is particularly suited for applications requiring quick replacement or modular assembly, while the radial lead option provides robust mechanical stability for permanent installations. With a current rating range spanning from 2mA to 5A, this fuse addresses a broad spectrum of protection needs, from ultra-sensitive signal circuits to low-power control systems. The optional clear cover allows for visual inspection of the fuse element, enabling proactive maintenance and reducing downtime in critical operations. One of the most compelling features of the MICRO™ H-PACK 5A is its military-grade availability, ensuring compliance with stringent MIL-SPEC standards for shock, vibration, and environmental resilience. This makes it a trusted choice for aerospace and defense applications, where failure is not an option. Additionally, the fuse boasts a high breaking capacity, capable of interrupting fault currents efficiently while minimizing arc energy and thermal stress. This combination of speed and robustness ensures that sensitive downstream components remain protected against transient overcurrents, voltage spikes, and other electrical anomalies. Typical applications for the Littelfuse MICRO™ H-PACK 5A fuse include power supplies for satellites and spacecraft, avionics systems, radar and communication equipment, industrial control panels, and high-reliability medical devices. Its compact form factor and low-profile design make it particularly well-suited for densely packed PCBs or space-constrained enclosures, where every millimeter of board real estate is valuable. Professionals in aerospace, defense, and industrial sectors rely on Littelfuse’s reputation for quality and innovation, trusting that products like the MICRO™ H-PACK meet or exceed the rigorous performance standards required in these fields. Installation is straightforward, with options for short or long leads to accommodate various mounting configurations. The fuse’s design prioritizes ease of integration, reducing assembly time and potential errors during production. For applications where visual confirmation of fuse status is critical, the clear cover option provides an immediate, at-a-glance assessment of the fuse element, eliminating the need for additional diagnostic tools. Whether deployed in a high-altitude aircraft, a satellite in orbit, or an industrial automation system, the Littelfuse MICRO™ H-PACK 5A fuse delivers the reliability and precision that engineers demand. Littelfuse, a global leader in circuit protection solutions, has built its reputation on delivering products that combine innovation with durability. With over a century of experience, the company’s fuses, sensors, and protection devices are trusted by industries where failure is catastrophic. The MICRO™ H-PACK 5A fuse is a testament to this legacy, offering a blend of compact design, high performance, and military-grade reliability that few competitors can match. For engineers and procurement professionals seeking a fuse that balances cutting-edge technology with time-tested reliability, the Littelfuse MICRO™ H-PACK 5A is an unparalleled solution.
  • Very fast-acting response for critical circuit protection
  • Available in plug-in or radial lead configurations with short/long lead options
  • Military-grade option for aerospace, defense, and high-reliability applications
  • High breaking capacity with optional clear cover for visual element inspection
  • Wide current range: 2mA to 5A for versatile design flexibility

Specifications

Amperage Rating
5 AMPS
Application
electronic equipment & appliances
Brand Name
Littelfuse
Connection Type
Plug-in or Radial Lead
Current Rating
5 A
Series
MICRO
Size
Compact (MICRO H-PACK)
Special Features
High breaking capacity
Standard
CSA Approval
Sub Brand
273 Series
Type
Plug In
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 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.