Littelfuse 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.
Littelfuse

SOO020

Alternate Item Number: 0SOO020.Z

UPC: 079458410716

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Overview

The **Littelfuse SOO020** is a premium **dual-element time delay Type S fuse**, engineered to deliver reliable motor and motor branch-circuit protection while also serving as a versatile solution for general-purpose circuits. Designed with industrial-grade durability, these fuses are trusted by professionals in commercial, manufacturing, and utility applications where consistent overcurrent protection is critical. The SOO020 fuses combine **time-delay characteristics** with **high interrupting ratings**, ensuring they withstand transient inrush currents common in motor-starting scenarios without nuisance tripping. This makes them ideal for protecting motors, transformers, and distribution systems where operational continuity is essential. **Key Features and Benefits:** - **Dual-Element Design:** Combines a **fast-acting element** for short-circuit protection with a **time-delay element** to handle temporary overloads, reducing unnecessary downtime. - **Type S Classification:** Meets stringent **UL 248** standards for branch-circuit protection, ensuring compatibility with most industrial and commercial electrical systems. - **High Interrupting Rating:** Safely interrupts high fault currents, protecting downstream equipment from damage. - **Time-Delay Response:** Allows brief overloads (e.g., motor startup) without tripping, while still providing robust protection against sustained overcurrents. - **Versatile Applications:** Suitable for **motor circuits, HVAC systems, lighting panels, transformers, and general branch-circuit protection** in facilities ranging from factories to data centers. **Why Choose Littelfuse SOO020 Fuses?** Littelfuse is a globally recognized leader in circuit protection, with over a century of innovation in electrical safety solutions. The **SOO020 fuses** are part of their **Type S fuse line**, a category widely adopted for its **reliability, ease of installation, and compliance** with NEC (National Electrical Code) requirements. Professionals in electrical contracting, plant maintenance, and facility management rely on Littelfuse for products that balance **performance, safety, and longevity**. **Typical Applications:** - **Motor Protection:** Safeguards motors from overloads and short circuits in HVAC systems, pumps, conveyors, and industrial machinery. - **Branch-Circuit Protection:** Ideal for panelboards, switchgear, and distribution boards where general-purpose circuit protection is required. - **Transformers & Capacitors:** Protects sensitive equipment from inrush currents and fault conditions. - **Commercial & Industrial Facilities:** Used in warehouses, manufacturing plants, hospitals, and data centers where uninterrupted power is critical. **Installation and Selection Considerations:** When specifying the **SOO020 fuse**, professionals should consider: - **Ampere Rating:** Match the fuse rating to the load requirements (e.g., motor full-load current + service factor). - **Voltage Rating:** Ensure compatibility with system voltage (e.g., 600V for most industrial applications). - **Enclosure Type:** Select the appropriate fuse holder or panelboard for safe installation. - **Code Compliance:** Verify adherence to **NEC Article 240** (overcurrent protection) and local electrical codes. **Why Trust Littelfuse?** With a legacy of **innovation and reliability**, Littelfuse has set the standard for circuit protection in industries worldwide. Their **Type S fuses**, including the **SOO020**, are trusted for their **consistent performance, durability, and adherence to global safety standards**. Whether protecting a critical motor drive in a factory or ensuring the safety of a commercial building’s electrical system, Littelfuse delivers solutions that engineers and electricians can depend on. For professionals seeking **high-performance, code-compliant fuses** that balance **protection, reliability, and ease of use**, the **Littelfuse SOO020** is a top-tier choice. Its **dual-element design, time-delay characteristics, and robust construction** make it a cornerstone of modern electrical protection strategies.
  • Dual-element design for motor and general circuit protection
  • Time-delay response handles temporary overloads without tripping
  • High interrupting rating for fault current protection
  • Compliant with UL 248 and NEC standards
  • Trusted Littelfuse quality for industrial and commercial applications

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)
0.045 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.