ATC-40 Equivalent & Substitute Parts

Part Overview

The ATC-40 is a 40 A automotive blade fuse rated for 32 V DC operation, manufactured by Eaton - Bussmann Electrical Division. This fast-blow fuse is designed for automotive electrical systems requiring holder-based installation in ATO/ATC form factor. The part is currently active in production with 926 units in stock. Substitute parts are identified when equivalent electrical ratings, mechanical form factors, and approval certifications align with the original specification, enabling direct replacement in automotive fuse holder applications.

Substiute Parts

ATC-40

Eaton - Bussmann Electrical DivisionIn Stock: 943ATC-40 Datasheet

Current PartRFQ

BK/ATC-40

Eaton - Bussmann Electrical DivisionIn Stock: 1262BK/ATC-40 Datasheet

DirectRFQ

0257040.PXAPC

Littelfuse Inc.In Stock: 40550257040.PXAPC Datasheet

DirectRFQ

0257040.PXAPCRT

Littelfuse Inc.In Stock: 72730257040.PXAPCRT Datasheet

DirectRFQ

0ATO040.V

Littelfuse Inc.In Stock: 17340ATO040.V Datasheet

DirectRFQ

0ATO040.VP

Littelfuse Inc.In Stock: 7160ATO040.VP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATC-40 are qualified based on the following criteria:

Electrical Parameters (Critical):

• Current Rating: 40 A
• Voltage Rating - DC: 32 V
• Breaking Capacity @ Rated Voltage: 1 kA

Mechanical Parameters (Critical):

• Package / Case: Blade, ATO/ATC
• Mounting Type: Requires Holder
• Physical dimensions within acceptable tolerance

Functional Parameters:

• Fuse Type: Automotive
• Response Time: Fast Blow

Compliance Parameters:

• Approval Agency: UL or equivalent (cULus, CSA, SAE acceptable)
• RoHS Status: RoHS3 Compliant or RoHS Compliant

Parts meeting all critical electrical, mechanical, and functional parameters are classified as direct substitutes. Variations in color, operating temperature range, or resistance specifications do not disqualify substitution when core ratings remain identical.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical requirements for direct replacement of the ATC-40 in automotive fuse holder applications. Selection among substitutes should be based on:

Manufacturer Preference: Eaton - Bussmann (ATC-40, BK/ATC-40) or Littelfuse Inc. (0257040 series, 0ATO040 series) are both established suppliers with active product status and full compliance certifications.

Approval Certifications: Parts carrying UL, cULus, or combined CSA/SAE/UL approvals satisfy automotive regulatory requirements. The BK/ATC-40 and 0ATO040.VP variants carry expanded certification coverage.

Inventory Availability: 0257040.PXAPCRT offers the highest stock level (7260 units), followed by 0257040.PXAPC (4005 units), supporting supply chain continuity.

RoHS Compliance: All substitutes meet ROHS3 Compliant or RoHS Compliant standards, ensuring environmental regulatory alignment.

Packaging Considerations: 0ATO040.VP is supplied in 5-pack card format; all other parts are supplied in bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can 0257040.PXAPC and 0257040.PXAPCRT be used interchangeably with ATC-40?

A: Yes. Both parts share identical electrical ratings (40 A, 32 V DC), mechanical form factor (Blade, ATO/ATC), and breaking capacity (1 kA). The PXAPCRT variant includes additional technical specifications (Melting I²t: 3310, DC Cold Resistance: 0.00144 Ohms) but does not alter substitution eligibility.

Q: What is the difference between 0ATO040.V and 0ATO040.VP?

A: Both parts are electrically and mechanically identical. The primary difference is packaging: 0ATO040.V is supplied in bulk, while 0ATO040.VP is supplied in 5-pack card format. Selection depends on quantity requirements and handling preferences.

Q: Are Littelfuse and Eaton - Bussmann fuses compatible in the same holder?

A: Yes. All substitute parts conform to the ATO/ATC blade form factor and mounting requirements, enabling installation in standard automotive fuse holders designed for ATC-40 specifications.

Q: Does the color difference (Amber vs. Orange) affect substitution?

A: No. Color is a visual indicator only and does not affect electrical performance or substitution eligibility. Both amber and orange variants meet the 40 A, 32 V DC specification.

Q: Which substitute offers the best compliance coverage?

A: 0ATO040.VP carries the broadest approval certifications (CSA, SAE, UL), making it suitable for applications requiring multi-standard validation. BK/ATC-40 and 0ATO040.V also meet standard automotive requirements with UL certification.