Littelfuse 251004L - VERY FAST-ACTING PICO II LEADS 4A. The PICO® II Very Fast-Acting Fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. Features: Very fast-acting. Small size. Wide current rating range (62mA- 15A). RoHS compliant. Halogen-free available. Wide operating temperature range. Low temperature rerating.
Littelfuse

251004L

Alternate Item Number: 0251004.VXL

UPC: 079458126730

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Overview

The Littelfuse PICO II Very Fast-Acting Fuse, SKU 251004L, represents a pinnacle of compact circuit protection technology, engineered to deliver exceptional performance in space-constrained applications. Designed for professionals who demand reliability and rapid response, this subminiature fuse offers a robust solution for safeguarding sensitive electronic components across a wide spectrum of industrial and consumer electronics. At its core, the PICO II fuse is characterized by its very fast-acting interruption capability. This crucial feature ensures that in the event of an overcurrent or short circuit, the fuse will open the circuit extremely quickly, thereby minimizing potential damage to downstream components and preventing cascading failures. This rapid response is paramount in high-density electronic assemblies where component sensitivity is high and space is at a premium. The subminiature package of the PICO II fuse is a significant advantage, allowing for its integration into designs where traditional fuse sizes would be prohibitive. This space-saving design does not compromise on performance; rather, it enhances design flexibility for engineers working on compact power supplies, portable devices, telecommunications equipment, and advanced control systems. Littelfuse has equipped the PICO II series with a broad current rating range, spanning from 62mA to 15A. The specific model, 251004L, features a 4A rating, making it suitable for a diverse array of applications requiring precise overcurrent protection. This wide range allows designers to select the optimal fuse for their specific needs, ensuring efficient and effective protection without oversizing. Environmental considerations are increasingly important in modern product design. The PICO II fuse is RoHS compliant, adhering to global standards for the restriction of hazardous substances. Furthermore, a halogen-free option is available, catering to applications with stringent environmental or regulatory requirements. This commitment to compliance underscores Littelfuse's dedication to sustainable manufacturing practices. Reliability under varying environmental conditions is another hallmark of the PICO II series. The fuse boasts a wide operating temperature range, ensuring consistent performance across different climates and operating environments. Additionally, its low temperature rerating capability means that the fuse's performance is predictable and stable even at lower ambient temperatures, a critical factor for equipment deployed in colder regions or for applications that experience significant temperature fluctuations. Key features of the Littelfuse PICO II Very Fast-Acting Fuse (SKU: 251004L) include: * **Very Fast-Acting Performance:** Rapid interruption to protect sensitive circuits. * **Subminiature Package:** Ideal for space-constrained designs. * **Wide Current Rating Range:** Available from 62mA to 15A for versatile application. * **RoHS Compliant:** Meets international hazardous substance restrictions. * **Halogen-Free Option:** Available for enhanced environmental compliance. * **Wide Operating Temperature Range:** Ensures reliable performance in diverse conditions. * **Low Temperature Rerating:** Predictable performance at lower ambient temperatures. When selecting a fuse, engineers prioritize factors such as interruption rating, voltage rating, and breaking capacity, alongside the critical characteristics of speed of operation and physical size. The PICO II series excels in providing a high level of protection in a small footprint, making it a preferred choice for applications such as: * Power supplies and adapters * Consumer electronics and appliances * Telecommunications infrastructure * Industrial control systems * Medical devices * Automotive electronics Trust in Littelfuse, a globally recognized leader in circuit protection, to provide the quality and reliability your critical applications demand. The PICO II Very Fast-Acting Fuse (SKU: 251004L) is a testament to their commitment to innovation and excellence in safeguarding electronic systems.
  • Very fast-acting interruption for superior circuit protection.
  • Space-saving subminiature package ideal for compact designs.
  • Wide current rating range (62mA-15A) for versatile application.
  • RoHS compliant and available in halogen-free options.
  • Reliable performance across a wide operating temperature range.

Specifications

Amperage Rating
4 Amps
Application
electronic equipment & appliances
Brand Name
Littelfuse
Current Rating
4 A
Series
PICO II
Size
Subminiature
Special Features
Wide operating temperature range
Standard
CSA Approval
Sub Brand
251 Series PICO II
Type
Small Size
Miniature fuse SMG - Fast Acting 350VAC 4A

SMG4

Miniature fuse SMG - Fast Acting 350VAC 4A
ALARM INDICATING W/PROTEC LENS 4A. Color-coded indicator flags indicate ampere rating. Body is constructed of black polyphenylene sulfide with UL-94V0 flammability rating, contacts are of bright alloy-plated beryllium copper. Ideal for telecommunications and control panel circuits.Eliminates down time by immediately pinpointing the blown (open) circuit while triggering LED or audio alarm, while placed in mating holder (482 Series). Clear plastic lens option available for additional safety.

0481004.VXL

ALARM INDICATING W/PROTEC LENS 4A. Color-coded indicator flags indicate ampere rating. Body is constructed of black polyphenylene sulfide with UL-94V0 flammability rating, contacts are of bright alloy-plated beryllium copper. Ideal for telecommunications and control panel circuits.Eliminates down time by immediately pinpointing the blown (open) circuit while triggering LED or audio alarm, while placed in mating holder (482 Series). Clear plastic lens option available for additional safety.

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.