Littelfuse SOO009 - SOO Fuses are dual-element time delay Type S fuses designed for motor and motor branch-circuit protection; also suitable for all general purpose circuits.
Littelfuse

SOO009

Alternate Item Number: 0SOO009.Z

UPC: 079458410648

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Overview

The **Littelfuse SOO009** is a high-performance **dual-element time delay Type S fuse** engineered for **motor protection** and **motor branch-circuit applications**, while also serving as a reliable solution for **general-purpose circuit protection** in industrial and commercial environments. Designed to meet the rigorous demands of modern electrical systems, this fuse combines **advanced dual-element technology** with **time-delay characteristics** to deliver superior overcurrent protection without unnecessary nuisance tripping. Whether protecting motors from transient overloads or safeguarding sensitive equipment in branch circuits, the SOO009 ensures **consistent performance, durability, and operational continuity**—critical factors in mission-critical applications. Type S fuses, such as the SOO009, are classified under the **UNSPSC code 39121605** and are widely recognized for their **interchangeability and standardization** in electrical distribution systems. Unlike standard fuses, dual-element fuses feature a **fast-acting element for short-circuit protection** and a **time-delay element for overload protection**, making them ideal for applications where motors experience **inrush currents** during startup. This dual-element design minimizes false trips while maintaining robust protection against sustained overloads, ensuring that motors and connected equipment operate safely under varying load conditions. **Key applications** for the Littelfuse SOO009 include: - **Motor circuits** in HVAC systems, pumps, conveyors, and industrial machinery - **Branch-circuit protection** in commercial buildings, manufacturing plants, and data centers - **General-purpose circuits** where reliable overcurrent protection is required - **Industrial control panels** and motor control centers (MCCs) - **Renewable energy systems**, including wind and solar power distribution Professionals in the electrical industry rely on **Littelfuse** for circuit protection solutions due to the company’s **decades of expertise, rigorous testing, and commitment to innovation**. The SOO009 fuse is manufactured to meet **industry standards**, including UL and NEC compliance, ensuring compatibility with a wide range of electrical systems. Its **time-delay feature** allows it to tolerate temporary overloads—such as those during motor startup—without interrupting operations, while still providing **instantaneous protection** against short circuits to prevent catastrophic damage. **Installation and selection** of the SOO009 fuse should be based on **ampere rating, voltage rating, and application requirements**. For motor circuits, the fuse rating should align with the **motor full-load current (FLC)** and **National Electrical Code (NEC) guidelines** to ensure proper coordination with overload relays and other protective devices. In general-purpose applications, the fuse should be sized to protect conductors and equipment from sustained overloads while avoiding unnecessary tripping. Littelfuse’s reputation for **quality and reliability** makes the SOO009 a trusted choice among electrical contractors, engineers, and facility managers. With a focus on **safety, performance, and longevity**, these fuses reduce downtime, lower maintenance costs, and enhance the overall resilience of electrical systems. Whether deployed in a **high-temperature industrial environment** or a **commercial building with sensitive electronics**, the SOO009 delivers **dependable circuit protection** that engineers and technicians can rely on.
  • Dual-element design for both overload and short-circuit protection
  • Time-delay feature minimizes nuisance tripping during motor startup
  • Suitable for motor circuits, branch circuits, and general-purpose applications
  • Complies with UL and NEC standards for industrial and commercial use
  • Trusted Littelfuse quality for long-lasting, dependable performance

Specifications

Application
General purpose circuits and small motor loads
Brand Name
Littelfuse
Series
SOO
Special Features
Time Delay
Sub Brand
SOO Series
Type
Plug Fuse
Package Weight (Imperial)
0.044 L
Package Weight (Metric)
0.020 kg
Littelfuse Plug fuses provide overcurrent protection to general purpose circuits and small motor loads. Edison-base Plug fuses (TOO and TLO series) feature metal threads similar to incandescent lamp bases. Type S Plug fuses (SOO and SLO series) utilize a nonmetallic threaded base and must be used with Type S adapters (SAO series). The National Electrical Code permits Edison base Plug fuses to be used for replacement purposes only. Type S fuses and adapters prevent shunting open fuses and over-fusing.

TOO6.25

Littelfuse Plug fuses provide overcurrent protection to general purpose circuits and small motor loads. Edison-base Plug fuses (TOO and TLO series) feature metal threads similar to incandescent lamp bases. Type S Plug fuses (SOO and SLO series) utilize a nonmetallic threaded base and must be used with Type S adapters (SAO series). The National Electrical Code permits Edison base Plug fuses to be used for replacement purposes only. Type S fuses and adapters prevent shunting open fuses and over-fusing.
Mersen plug fuses are intended for industrial and residential applications. Non time-delay fuses are available for receptacle and lighting circuits and time-delay fuses for motor loads. For Canadian requirements, a type P fuse is used for non-motor loads and Type D, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type S plug fuses are time-delay and tamper resistant. 125 Volts 15 Amps GP series. 125 Volts 20 Amps GTL series.

GTL20

Mersen plug fuses are intended for industrial and residential applications. Non time-delay fuses are available for receptacle and lighting circuits and time-delay fuses for motor loads. For Canadian requirements, a type P fuse is used for non-motor loads and Type D, for electrical heating and cyclical load circuits. Both fuses have low melting-point temperature elements. Type S plug fuses are time-delay and tamper resistant. 125 Volts 15 Amps GP series. 125 Volts 20 Amps GTL series.
RTNG PLUG 400A/1000CT MVT PLUS

TR10B400

RTNG PLUG 400A/1000CT MVT PLUS

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.