Littelfuse 0257003.L Automotive Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0257003.L is a 3A 32VDC automotive blade fuse designed for ATO/ATC holder applications. This part carries an Obsolete product status, making identification of active equivalent components essential for ongoing system support and procurement planning. The fuse provides fast-blow protection with a 1kA breaking capacity and operates across the -40°C to 105°C temperature range typical of automotive environments.

Substiute Parts

0257003.L

Littelfuse Inc.In Stock: 9840257003.L Datasheet

Current PartRFQ

0287003.PXCN

Littelfuse Inc.In Stock: 72320287003.PXCN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0257003.L is determined by strict equivalence across the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating (DC): 32 V (exact match required)
• Package / Case: Blade, ATO/ATC (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 1kA (exact match required)
• Melting I²t: 7.4 (exact match required)
• Operating Temperature Range: -40°C ~ 105°C (exact match required)

The Littelfuse 0287003.PXCN meets all substitution criteria. Minor dimensional variations (0.750" vs 0.752" length; 0.200" vs 0.201" width; 0.480" vs 0.484" height) remain within acceptable tolerances for ATO/ATC holder compatibility. The substitute part maintains identical electrical performance characteristics and is manufactured by the same supplier.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0287003.PXCN is the direct functional equivalent for the obsolete 0257003.L. Both parts are manufactured by Littelfuse Inc. and maintain identical electrical and thermal specifications. The substitute part carries Active product status, ensuring continued availability and supply chain reliability.

The 0287003.PXCN holds ROHS3 compliance and UL approval certification, meeting current regulatory requirements. The main part (0257003.L) carries cULus approval. Both certifications are appropriate for automotive fuse applications.

Selection of the 0287003.PXCN eliminates obsolescence risk while preserving all functional and mechanical compatibility with existing ATO/ATC holder installations.

Frequently Asked Questions (FAQ)

Q: Can the 0287003.PXCN be used as a direct replacement for the 0257003.L?

A: Yes. Both parts are identical in current rating (3A), voltage rating (32VDC), response time (Fast Blow), breaking capacity (1kA), melting I²t (7.4), and operating temperature range (-40°C to 105°C). The package type (Blade, ATO/ATC) is identical, ensuring mechanical compatibility with existing holders.

Q: What are the dimensional differences between these parts?

A: The 0257003.L measures 0.750" L × 0.200" W × 0.480" H (19.05mm × 5.08mm × 12.19mm). The 0287003.PXCN measures 0.752" L × 0.201" W × 0.484" H (19.10mm × 5.10mm × 12.30mm). These variations are within acceptable tolerances for ATO/ATC holder compatibility.

Q: Why is the 0257003.L marked as Obsolete?

A: The 0257003.L has been discontinued by Littelfuse Inc. The 0287003.PXCN represents the active equivalent product line and is the recommended procurement choice for new applications and replacements.

Q: Are there compliance differences between the two parts?

A: The 0257003.L carries cULus approval. The 0287003.PXCN carries UL approval. Both certifications are appropriate for automotive fuse applications. The 0287003.PXCN is ROHS3 compliant and REACH Unaffected, meeting current regulatory standards.

Q: What is the difference between the ATO® and ATOF® series designations?

A: Both designations refer to automotive blade fuse form factors compatible with ATO/ATC holders. The series designation reflects product line organization within Littelfuse's portfolio. Electrical and mechanical specifications remain identical between the two parts.