Littelfuse ATO004 - FAST-ACTING AUTOMOTIVE BLADE FUSE 4A. The ATO® Fuse was designed and patented by Littelfuse in 1976 and set the standard for automotive circuit protection. It features industry standard color coding to indicate amperage rating.287 Series replaces 257 Series.
Littelfuse

ATO004

Alternate Item Number: 0ATO004.V

UPC: 079458005431


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Overview

The Littelfuse ATO004, SKU ATO004, is a 4 Amp fast-acting automotive blade fuse, a cornerstone of the industry-standard ATO® series, originally patented by Littelfuse in 1976. This fuse is engineered to provide reliable circuit protection for a wide range of low-voltage electronic applications in both foreign and domestic automobiles and trucks. As an original equipment circuit protection standard, the ATOF® fuse (0287004.L, 0287004.U, 0287004.PXCN) ensures critical protection for sensitive automotive components against overcurrents and short circuits. Its readily identifiable design, featuring industry-standard color coding to indicate amperage, facilitates easy replacement and minimizes vehicle downtime. The 287 Series replaces the 257 Series, offering enhanced reliability and consistency. This 4A fuse is ideal for safeguarding essential vehicle electrical systems, ensuring optimal performance and safety. Trust Littelfuse, a recognized leader in circuit protection, for high-quality fuses that meet stringent automotive standards. The ATO series is designed for easy identification and quick replacement, making it a practical choice for automotive maintenance and repair. Its robust construction ensures dependable operation in challenging automotive environments. Specifications include a current rating of 4A and a 1-pole configuration. The UNSPSC code for this product is 39121622, and it is manufactured in the US.
  • 4 Amp fast-acting automotive blade fuse
  • Industry-standard ATO® series, patented by Littelfuse in 1976
  • Original equipment circuit protection standard for foreign and domestic vehicles
  • Features industry-standard color coding for easy amperage identification
  • 287 Series replaces the 257 Series for enhanced reliability

Specifications

Amperage Rating
4 Amps
Application
Indicator
Brand Name
Littelfuse
Current Rating
4 A
Poles
1-pole
Series
ATO
Special Features
Color Coded
Standard
SAE J1284
Sub Brand
ATO Series
Type
Automotive Blade Fuse
Package Dimensions (L x W x H)
3 IN x 2 IN x 1 IN
Package Dimensions (L x W x H)
7.62 cm x 5.08 cm x 25.4 mm
Package Weight (Imperial)
0.050 L
Package Weight (Metric)
0.023 kg
FAST-ACTING AUTOMO BLADE U-PACK 3A. Developed by Littelfuse for the automotive industry, the ATOF® fuse has become the original equipment circuit protection standard for foreign and domestic automobiles and trucks. Readily identifiable and easily replaced, this fuse can be specified for a variety of low voltage electronic applications.

0287003.U

FAST-ACTING AUTOMO BLADE U-PACK 3A. Developed by Littelfuse for the automotive industry, the ATOF® fuse has become the original equipment circuit protection standard for foreign and domestic automobiles and trucks. Readily identifiable and easily replaced, this fuse can be specified for a variety of low voltage electronic applications.

Frequently Asked Questions

What UL standard does the Industrial Shock-Block GFCI meet?

The Industrial Shock-Block GFCI meets UL Standard 943C Class C and Class D.

What is the primary function of Littelfuse arc-flash relays?

Arc-flash relays detect developing arc-flash incidents and send a trip signal to interrupt power before significant damage.

What do trailing-cable protection relays continuously monitor?

Trailing-cable protection relays continuously monitor the integrity of the ground conductor in portable cables.

What conditions do ground-fault protection relays detect?

Ground-fault relays detect insulation resistance breakdown caused by moisture, vibration, chemicals, or dust.

What applications are available for Littelfuse pump controllers?

Littelfuse pump controllers are available for both single-phase and three-phase applications.

What are the voltage and current ratings for 10x38mm fuses?

10x38mm fuses have ratings from 125 to 1000 volts and 1/10 to 30 amperes.

What is the maximum voltage rating for Littelfuse solar fuses?

Littelfuse offers solar fuses and holders up to 1500 Vdc for various current applications.

How do POWR-BLOKS power distribution blocks enhance safety?

POWR-BLOKS enhance safety with touch-safe blocks and available covers, reducing accidental contact risk.

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.