Littelfuse SPF012H - 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

SPF012H

Alternate Item Number: 0SPF012.H

UPC: 079458169324

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Overview

The Littelfuse SPF Solar Protection Fuse series, including the SPF012H (SKU: SPF012H), is engineered for the critical protection of photovoltaic (PV) systems. This family of midget-style fuses, measuring 10 x 38 mm, is designed to safely protect PV modules and conductors from reverse-overcurrent conditions. As PV systems grow in size and voltage requirements increase to minimize power loss over long conductor runs, standard circuit protection devices are insufficient. The SPF series is UL Listed to safely interrupt faulted circuits up to a demanding 1000 V dc. Key features include a full-range, fast-acting design that helps eliminate common low-overload faults and prevents power generation losses due to nuisance tripping from temperature changes. The SPF series offers a comprehensive range of ampere ratings from 1 A to 30 A, including 1, 2, 3, 3.5, 4, 5, 6, 8, 10, 12, 15, 20, 25, and 30 A, enabling precise application matching. Installation flexibility is provided through available PCB mount and dead-front holder options. Primary applications for the SPF series include inverters, combiner boxes, and battery charge controllers. Specifications for the SPF012H include a 1000 V dc voltage rating and a maximum interrupting rating of 20 kA for 1-20 A fuses and 50 kA for 25-30 A fuses. The time constant is ≤ 2ms. The fuse features a melamine body and copper alloy caps, and is RoHS compliant. Approvals include UL Listed (File: E339112), CSA Certified (File: 029862_0_000), and TUV (Cert: J 50494849), adhering to UL 248-1 and 248-19, and IEC 60269-6 standards. The SPF012H is manufactured in Mexico. Recommended accessories include the LPHV 1000 V dc POWR-Safe Series Fuse Holder and 125003 Fuse Clips. For technical documents, visit Littelfuse.com/SPF.
  • Designed for photovoltaic (PV) system protection
  • 10 x 38 mm midget-style fuse
  • 1000 V dc voltage rating
  • UL Listed for safe interruption of faulted circuits
  • Full-range, fast-acting for low-overload faults

Specifications

Application
1000 VDC PV
Brand Name
Littelfuse
Current Rating
12 A
Material
Melamine body, Copper alloy caps
Series
SPF
Size
10 x 38 mm
Special Features
Solar
Standard
UL 2579 IEC 60269-6
Sub Brand
SPF Series
Type
Full Range
Voltage Rating
1000 Vdc
Package Weight (Imperial)
0.015 L
Package Weight (Metric)
7.010 g

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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.