Authorized Littelfuse Distributor
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 SOO Fuses are dual-element time delay Type S fuses designed for motor and motor…

Alternate Item Number: 0SOO009.Z

UPC: 079458410648

Documents & Media
BrochureTechnical BulletinSpecification Sheet

Contact for Pricing

Minimum Qty: 4

Multiplier: 4

*Contact for lower quantities*

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

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
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.

SOO012

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.
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.

SOO010

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.
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.

SOO020

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.
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.

SOO030

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.
The National Electric Code now permits Edison-base fuses to be used only for replacements in existing installations, and then, only when there is no evidence of overfusing or tampering. All new Edison-based fuseholders must have Type S fuse adapters installed before they are placed in service. Designed to prevent installation of wrong size fuses, Type S Adapters (SAO series) screw into Edison-base fuseholders so they may accept Type S fuses. Once installed the adapters cannot be removed. To prevent shunting of open fuses or overfusing, and to reduce nuisance fuse opening, it is recommended that SAO adapters with properly rated SLO or SOO series fuses be installed in all Edison-base fuseholders.

SAO002

The National Electric Code now permits Edison-base fuses to be used only for replacements in existing installations, and then, only when there is no evidence of overfusing or tampering. All new Edison-based fuseholders must have Type S fuse adapters installed before they are placed in service. Designed to prevent installation of wrong size fuses, Type S Adapters (SAO series) screw into Edison-base fuseholders so they may accept Type S fuses. Once installed the adapters cannot be removed. To prevent shunting of open fuses or overfusing, and to reduce nuisance fuse opening, it is recommended that SAO adapters with properly rated SLO or SOO series fuses be installed in all Edison-base fuseholders.

Frequently Asked Questions

What types of fuses does Littelfuse offer for industrial applications?

Littelfuse offers UL Class fuses, high-speed fuses, medium voltage fuses, 10 x 38 mm fuses, and solar fuses for industrial applications.

Where can I find training courses on Littelfuse products?

In-depth training courses and quick references can be found on the award-winning Littelfuse University (LFU) website.

How can I access technical information and cross-reference tools?

Technical information and cross-reference tools are available at Littelfuse.com/technical-resources.

What are Littelfuse fuse blocks and holders used for?

Littelfuse fuse blocks and holders are selected for their compact designs, indication features, and flexibility of DIN-rail mounting.

What is the purpose of POWR-BLOKS power distribution blocks?

POWR-BLOKS power distribution blocks provide a safe and convenient way for splicing cables and managing power distribution requirements.

What protection do Littelfuse feeder protection relays offer?

Feeder protection relays protect circuits from overcurrent, ground faults, phase loss, overload, and other detrimental conditions.

What is the Industrial Shock-Block® GFCI designed for?

The Industrial Shock-Block® GFCI is designed for people protection in industrial facilities and meets UL Standard 943C Class C and Class D.

How do high-resistance grounding systems benefit industrial applications?

High-resistance grounding limits point-of-fault damage and eliminates arc-flash hazards and transit overvoltages associated with ground faults.

What kind of protection do Littelfuse voltage monitors provide?

Voltage monitors provide protection against both supply line and load side faults when the motor is running.

What functions can Littelfuse timers and flashers control?

Timers and flashers can delay starting and stopping loads, and control cycling and sequencing of motors, pumps, compressors, heaters, and lighting.

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.