Littelfuse SPF001 - The SPF Solar Protection Fuse series has been specifically designed for the protection of photovoltaic (PV) systems. This family of Midget style fuses (10 x 38 mm) can safely protect PV modules and conductors from reverseovercurrent conditions. As PV systems have grown in size, so have the corresponding voltage requirements. This increase in system voltage has typically been intended to minimize power loss associated with long conductor runs. Standard circuit protection devices are not designed to completely protect photovoltaic panels. However, the SPF series is UL Listed to safely interrupt faulted circuits up to this demanding voltage level. Littelfuse offers multiple ampere ratings to match specific requirements in a variety of applications.
Littelfuse

SPF001

Alternate Item Number: 0SPF001.T

UPC: 079458169072


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Overview

The Littelfuse SPF001 Solar Protection Fuse is a critical component for safeguarding photovoltaic (PV) systems against reverse overcurrent conditions, ensuring optimal performance and longevity. Designed as a Midget-style fuse (10 x 38 mm), the SPF001 is part of Littelfuse’s SPF series, engineered specifically for the unique demands of solar power installations. As PV systems scale to higher voltages to minimize power loss over long conductor runs, standard circuit protection devices often fail to meet the stringent requirements of these high-voltage environments. The SPF series, including the SPF001, is UL Listed to safely interrupt faulted circuits at these demanding voltage levels, providing reliable protection for PV modules and conductors. PV systems are inherently complex, with multiple strings, inverters, and combiner boxes working in tandem to convert sunlight into usable electricity. However, faults such as reverse currents or overcurrent conditions can pose significant risks, including fire hazards, equipment damage, and system downtime. The Littelfuse SPF001 addresses these challenges by offering robust overcurrent protection tailored to the unique characteristics of solar applications. Its compact Midget-style design (10 x 38 mm) ensures compatibility with standard fuse holders and panels, making it an ideal choice for both residential and commercial solar installations. One of the standout features of the SPF001 is its ability to operate reliably in high-voltage environments, a critical requirement as solar systems grow in size and complexity. Traditional fuses are not designed to handle the high DC voltages typical in PV systems, which can exceed 1000V in large-scale installations. The SPF series, including the SPF001, is engineered to meet these challenges head-on, providing a UL-certified solution that ensures safe and efficient operation. This certification is a testament to Littelfuse’s commitment to quality and safety, a reputation built over decades in the electrical protection industry. The SPF001 is available in multiple ampere ratings, allowing professionals to select the optimal fuse for their specific application. Whether protecting individual PV modules, string inverters, or combiner boxes, the SPF001 provides a tailored solution that balances performance and safety. Its design also accounts for the harsh environmental conditions often encountered in solar installations, including temperature fluctuations, UV exposure, and moisture, ensuring long-term reliability. For solar installers, electrical contractors, and system designers, the Littelfuse SPF001 represents a trusted choice for overcurrent protection in PV systems. Its UL Listing provides peace of mind, while its compatibility with standard fuse holders simplifies installation and maintenance. By integrating the SPF001 into their designs, professionals can enhance the safety, efficiency, and longevity of solar power systems, protecting both equipment and investments. With Littelfuse’s reputation for innovation and reliability, the SPF001 is a smart investment for any solar project, from small residential arrays to large-scale utility installations.
  • Midget-style fuse (10 x 38 mm) designed for PV systems
  • UL Listed for safe interruption of faulted circuits in high-voltage applications
  • Protects PV modules and conductors from reverse overcurrent conditions
  • Available in multiple ampere ratings for tailored system protection
  • Compact design compatible with standard fuse holders and panels

Specifications

Application
1000 VDC PV
Brand Name
Littelfuse
Series
SPF
Size
10 x 38 mm
Special Features
Solar
Standard
UL 2579 IEC 60269-6
Sub Brand
SPF Series
Type
Full Range
Package Weight (Imperial)
0.015 L
Package Weight (Metric)
7.010 g
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.