Littelfuse TOO025 - 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.
Littelfuse

TOO025

Alternate Item Number: 0TOO025.Z

UPC: 079458430721

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Overview

The Littelfuse TOO025 Plug Fuse (SKU: TOO025) is a critical component for ensuring the safety and reliability of general-purpose electrical circuits and small motor loads. Manufactured by Littelfuse, a globally recognized leader in circuit protection, this Edison-base plug fuse is engineered to provide robust overcurrent protection, safeguarding equipment from damage caused by excessive current. Its design features metal threads, mirroring the construction of incandescent lamp bases, which facilitates straightforward installation and compatibility within existing infrastructure. According to the National Electrical Code (NEC), Edison-base plug fuses like the TOO025 are permitted for replacement purposes only. This designation is crucial for maintaining system integrity and preventing potential hazards. The primary function of the TOO025 is to interrupt the flow of current when it exceeds a safe level, thereby preventing overheating, fires, and damage to connected devices. This makes it an indispensable part of electrical systems in a wide array of industrial, commercial, and residential applications where older fuse types are still in use for specific circuits. While the TOO025 is ideal for replacement applications, Littelfuse also offers advanced solutions for enhanced safety and code compliance. The Type S Plug fuses (SOO and SLO series) are designed with a nonmetallic threaded base and require the use of Type S adapters (SAO series). This system is specifically engineered to prevent the common practice of "shunting" – bypassing a blown fuse with conductive material – and "over-fusing" – inserting a fuse with a higher amperage rating than the circuit is designed for. These safety features are paramount in preventing electrical fires and ensuring that circuits are protected with the correct amperage rating as intended by the original design. Choosing Littelfuse for your circuit protection needs means investing in quality, durability, and peace of mind. The TOO025 plug fuse embodies the company's commitment to providing dependable and effective solutions. Its straightforward design ensures ease of use for qualified personnel performing maintenance and replacements. For applications demanding the highest level of safety and adherence to modern electrical codes, consider the Littelfuse Type S fuse and adapter system. However, for authorized replacement applications, the Littelfuse TOO025 remains a trusted and effective choice for protecting valuable electrical assets. Key features and benefits of the Littelfuse TOO025 Plug Fuse include: * **Reliable Overcurrent Protection:** Effectively interrupts excessive current to prevent damage. * **Edison-Base Design:** Features metal threads for compatibility with standard incandescent lamp bases, ideal for replacement. * **NEC Compliant for Replacement:** Permitted for use as a direct replacement in existing Edison-base fuse holder applications. * **Durable Construction:** Built to withstand industrial environments. * **Manufacturer Reputation:** Backed by Littelfuse, a trusted name in circuit protection for decades. When selecting fuses, it is imperative to consult the NEC and local electrical codes, as well as the equipment manufacturer's specifications, to ensure the correct fuse type and rating are used. The Littelfuse TOO025 is a testament to the company's dedication to providing a comprehensive range of circuit protection devices to meet diverse application requirements.
  • Provides reliable overcurrent protection for general-purpose circuits and small motor loads.
  • Features an Edison-base design with metal threads, compatible with standard incandescent lamp bases.
  • Approved by the National Electrical Code (NEC) for replacement purposes only.
  • Ensures circuit safety by interrupting excessive current flow.
  • Manufactured by Littelfuse, a trusted leader in circuit protection solutions.

Specifications

Application
General purpose circuits and small motor loads
Brand Name
Littelfuse
Material
Metal
Mounting Type
Edison-base
Series
TOO
Special Features
Metal threads
Sub Brand
TOO Series
Type
Time Delay Fuse
Package Weight (Imperial)
0.050 L
Package Weight (Metric)
0.023 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.

TOO030

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.
Fuse TD - Plug - Time-Delay 125VAC 15A Screw Visual Indicator

TD15

Fuse TD - Plug - Time-Delay 125VAC 15A Screw Visual Indicator

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.