Littelfuse SAO005 - 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.
Littelfuse

SAO005

Alternate Item Number: 0SAO005.Z

UPC: 079458400557

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Overview

The **Littelfuse SAO005 Type S Adapter** is a critical safety and compliance solution for industrial and commercial electrical systems requiring Edison-base fuseholders. Designed to meet **National Electric Code (NEC) regulations**, this adapter transforms standard Edison-base fuseholders into secure, tamper-resistant receptacles for **Type S fuses**, eliminating the risk of overfusing, improper fuse sizing, or unauthorized modifications. Once installed, the SAO005 adapter cannot be removed, providing a permanent safeguard against electrical hazards and ensuring long-term system integrity. **Key Features and Benefits:** - **NEC Compliance:** The SAO005 adapter ensures adherence to NEC requirements, which now restrict Edison-base fuses to replacement-only use in existing installations unless Type S adapters are installed. This compliance is essential for avoiding code violations and potential liability in commercial and industrial facilities. - **Tamper Resistance:** The one-way installation design prevents removal, deterring tampering, shunting of open fuses, or the insertion of incorrect fuse sizes. This feature is particularly valuable in high-risk environments where unauthorized access to electrical systems could lead to catastrophic failures. - **Enhanced Safety:** By enforcing the use of properly rated **Type S fuses** (such as Littelfuse’s SLO or SOO series), the SAO005 adapter reduces the risk of overcurrent conditions, nuisance fuse openings, and electrical fires. This proactive approach to safety aligns with industry best practices for risk mitigation in power distribution systems. - **Versatile Applications:** Ideal for a wide range of industrial and commercial applications, including manufacturing plants, data centers, hospitals, and commercial buildings. The adapter is compatible with standard Edison-base fuseholders, making it a cost-effective upgrade for legacy systems or new installations requiring NEC-compliant fuse protection. - **Durable and Reliable:** Constructed from high-quality materials, the SAO005 adapter is built to withstand harsh industrial environments, including exposure to dust, moisture, and mechanical stress. Its robust design ensures reliable performance over the lifecycle of the electrical system. **Why Choose Littelfuse for Type S Adapters?** Littelfuse is a globally recognized leader in circuit protection, with over a century of innovation and expertise in electrical safety solutions. The company’s **SAO series adapters** are trusted by electrical contractors, facility managers, and safety engineers for their precision engineering, strict quality control, and unwavering commitment to compliance with industry standards. By selecting Littelfuse, professionals gain access to a product backed by comprehensive technical support, global distribution, and a reputation for reliability in critical applications. **Installation and Usage Considerations:** - **Compatibility:** The SAO005 adapter is designed for use with standard Edison-base fuseholders and is compatible with Type S fuses rated for the specific application’s current and voltage requirements. - **Permanent Installation:** Once installed, the adapter cannot be removed without damaging the fuseholder, ensuring that the system remains tamper-proof. This feature is particularly important in facilities where electrical safety audits are conducted regularly. - **Pairing with Fuses:** For optimal performance, pair the SAO005 adapter with Littelfuse’s **SLO or SOO series fuses**, which are engineered to work seamlessly with Type S adapters. This combination minimizes nuisance fuse openings and enhances system reliability. - **Code Compliance:** Always verify local electrical codes and NEC requirements before installation to ensure full compliance. The SAO005 adapter is a proactive step toward meeting these standards and avoiding costly retrofits or penalties. **Industry Applications:** - **Manufacturing:** Protects machinery and equipment from overcurrent conditions in production lines. - **Commercial Buildings:** Ensures safe and compliant fuse protection in office buildings, retail spaces, and hospitality facilities. - **Healthcare:** Critical for hospitals and medical facilities where uninterrupted power and safety are paramount. - **Data Centers:** Safeguards sensitive IT infrastructure from electrical faults and downtime. - **Renewable Energy:** Suitable for solar and wind power systems where NEC compliance is required for fuse protection. Investing in the **Littelfuse SAO005 Type S Adapter** is a proactive measure to enhance electrical safety, ensure regulatory compliance, and protect valuable assets. Trust Littelfuse’s expertise to deliver a solution that meets the demands of modern industrial and commercial electrical systems.
  • NEC-compliant Type S adapter for Edison-base fuseholders
  • Permanent installation prevents tampering and unauthorized fuse changes
  • Reduces risk of overfusing, shunting, and nuisance fuse openings
  • Compatible with Littelfuse SLO or SOO series Type S fuses
  • Ideal for industrial, commercial, and healthcare applications

Specifications

Application
General purpose circuits and small motor loads
Brand Name
Littelfuse
Material
High-quality materials
Special Features
Feature metal threads
Sub Brand
SAO Series
Type
Plug Fuse Adapter
Package Weight (Imperial)
0.026 L
Package Weight (Metric)
0.012 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.