Littelfuse SPFRHD4001ST - SPFR 400AMP SINGLE POLE HOLDER / STUDS. The SPFRHD series is specifically designed for 1000 Vdc SPFR fuses ranging up to 400 A in current. It is self-certified to 1000 V and UL Recognized to 600 V.
Littelfuse

SPFRHD4001ST

UPC: 079458183092


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Overview

The Littelfuse SPFRHD4001ST is a single-pole fuse holder designed for 1000 Vdc SPFR fuses rated up to 400 A. Engineered for high-voltage DC applications, this holder is self-certified to 1000 Vdc and UL Recognized to 600 V, ensuring compliance with stringent safety standards. Its robust construction provides secure mounting and reliable electrical connections, critical for industrial power distribution systems and renewable energy installations. The SPFRHD4001ST is optimized for compatibility with Littelfuse SPFR fuses, offering dependable protection for photovoltaic (PV) systems, inverters, combiner boxes, and battery charge controllers. Unlike standard midget-style fuse holders (10 x 38 mm, 1-30 A), this holder accommodates higher current ratings up to 400 A, making it ideal for demanding DC circuits requiring robust overcurrent protection. The stud-type connection ensures stable termination for high-current applications, including power semiconductor devices in variable frequency drives, UPS systems, and electric vehicle charging stations. With a voltage rating of 1000 Vdc and current rating of 400 A, the SPFRHD4001ST delivers reliable performance in DC systems where safety and efficiency are paramount. Its design facilitates secure mounting and long-term operational stability in harsh industrial environments.
  • Voltage Rating: 1000 Vdc (self-certified), UL Recognized to 600 V
  • Current Rating: 400 A for high-capacity DC circuits
  • Connection Type: Studs for secure high-current termination
  • Single Pole Design for 1000 Vdc SPFR fuses (10 x 38 mm)
  • Compatible with photovoltaic systems, inverters, and battery charge controllers

Specifications

Application
Inverters and Combiner Boxes
Brand Name
Littelfuse
Special Features
Replaced by SPFRHV
Standard
UL Recognized CSA Certified
Sub Brand
POWR-GARD SPFRHD Series
Type
SolarRated
Package Dimensions (L x W x H)
2 IN x 1 IN x 1 IN
Package Dimensions (L x W x H)
5.08 cm x 25.4 mm x 25.4 mm
Package Weight (Imperial)
0.250 L
Package Weight (Metric)
0.113 kg
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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

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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.