Littelfuse SPFI03.5T - The Littelfuse SPFI solar fuse is designed to integrate into an in-line assembly within a wire harness. The fuse provides photovoltaic (PV) protection that meets UL 248-19 for photovoltaic applications. The SPFI can be electrically insulated by either over molding or using heat-shrink.
Littelfuse

SPFI03.5T

Alternate Item Number: SPFI03.5T

UPC: 079458795448


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Overview

The Littelfuse SPFI03.5T is a specialized in-line solar fuse engineered for robust protection within photovoltaic (PV) systems. Designed to integrate seamlessly into wire harness assemblies, this fuse provides critical overcurrent protection, meeting the stringent UL 248-19 standards specifically for photovoltaic applications. Its compact design and the absence of a separate fuse holder contribute to significant space, time, and cost savings during installation and manufacturing. The SPFI series is built with a one-piece cap design, eliminating joints and facilitating easier wire crimping and more streamlined overmolding processes. This feature enhances the overall integrity and efficiency of the wire harness assembly. With a high interrupting rating of 20,000 A, the SPFI03.5T ensures reliable performance by safely interrupting fault currents, thereby safeguarding sensitive PV modules and conductors from damage. Key features and benefits of the Littelfuse SPFI03.5T include: * **UL 248-19 Compliance:** Specifically recognized for photovoltaic applications, ensuring adherence to critical safety standards. * **High Interrupting Rating:** A 20 kA interrupting rating provides robust protection against severe fault conditions. * **In-line Integration:** Designed for direct integration into wire harnesses, eliminating the need for bulky fuse holders. * **Flexible Insulation:** Can be electrically insulated via overmolding or heat-shrink tubing, offering installation versatility. * **Durable Construction:** Features a melamine body and nickel-plated copper alloy caps for longevity in demanding environments. This fuse is ideal for a wide range of photovoltaic applications, from residential solar installations to large-scale commercial and utility solar farms. The ability to be insulated through overmolding or heat-shrink allows for a highly integrated and protected solution, crucial for the long-term reliability and safety of solar energy systems. Littelfuse's reputation for quality and innovation in circuit protection makes the SPFI03.5T a trusted component for solar professionals seeking dependable performance and compliance. The fuse's construction materials, including melamine for the body and nickel-plated copper alloy for the caps, are selected for their durability and resistance to environmental factors common in solar installations. Furthermore, its design is optimized for efficient manufacturing processes, reducing assembly time and material costs. The SPFI03.5T is a testament to Littelfuse's commitment to providing advanced protection solutions for the growing renewable energy sector, ensuring the integrity and longevity of solar power generation.
  • Designed for photovoltaic (PV) systems, meeting UL 248-19 standards.
  • In-line integration into wire harnesses, eliminating the need for separate fuse holders.
  • High interrupting rating of 20,000 A for robust fault current protection.
  • Electrically insulated via overmolding or heat-shrink for versatile installation.
  • Durable construction with melamine body and nickel-plated copper alloy caps.

Specifications

Application
1000 VDC PV
Brand Name
Littelfuse
Connection Type
In-line wire harness crimp
Current Rating
3.5A
Material
Melamine body, Nickel-plated copper alloy caps
Mounting Type
In-line assembly within wire harness
Series
SPFI
Special Features
Solar
Standard
UL 2579 IEC 60269-6
Sub Brand
SPF Series
Type
Full Range
Voltage Rating
1000V DC

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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.