0257040.PXPV Automotive Fuse 40A 32VDC ATO Blade Equivalent & Substitute Parts

Part Overview

The 0257040.PXPV is a 40A 32VDC automotive blade fuse manufactured by Littelfuse Inc. in the ATO/ATC package format. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing system support and procurement requirements. The fuse is designed for automotive electrical protection applications requiring fast-blow response characteristics and operates within a 32V DC voltage specification.

Substiute Parts

0257040.PXPV

Littelfuse Inc.In Stock: 52300257040.PXPV Datasheet

Current PartRFQ

0287040.PXCN

Littelfuse Inc.In Stock: 934190287040.PXCN Datasheet

DirectRFQ

BK/ATC-40

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

DirectRFQ

APR-40A

OptiFuseIn Stock: 15649APR-40A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0257040.PXPV is determined by strict equivalence across the following critical parameters:

• Current Rating: 40 A (exact match required)
• Voltage Rating - DC: 32 V (exact match required)
• Package / Case: Blade, ATO/ATC (exact match required)
• Fuse Type: Automotive (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Melting I²t: 3310 (exact match required)
• DC Cold Resistance: 0.00144 Ohms (exact match required)

Three substitute parts meet these criteria and are identified as direct equivalents or parametric equivalents:

1. 0287040.PXCN (Littelfuse Inc.) - Direct manufacturer equivalent with active product status
2. BK/ATC-40 (Eaton - Bussmann Electrical Division) - Direct equivalent from alternative manufacturer
3. APR-40A (OptiFuse) - Parametric equivalent meeting all electrical specifications

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 0287040.PXCN

The 0287040.PXCN is the preferred substitute for the obsolete 0257040.PXPV. Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications, melting I²t values, and DC cold resistance. The 0287040.PXCN maintains active product status with CSA and UL approval certifications and an extended operating temperature range of -40°C to 105°C. Packaging is available in bulk format with substantial inventory availability (93,400 pcs).

Secondary Recommendation: BK/ATC-40

The BK/ATC-40 from Eaton - Bussmann Electrical Division is a qualified alternative meeting all critical electrical parameters. This part carries UL approval and maintains active product status. Physical dimensions show minor variation (0.760" L x 0.207" W x 0.492" H versus 0.752" L x 0.201" W x 0.484" H), which may require mechanical clearance verification in constrained mounting applications. Inventory availability is limited (1,194 pcs).

Tertiary Recommendation: APR-40A

The APR-40A from OptiFuse meets all parametric electrical specifications and maintains identical physical dimensions to the original part. This part carries ISO and SAE approval certifications and maintains active product status. Inventory availability is substantial (15,599 pcs).

Frequently Asked Questions (FAQ)

Q: Can the 0287040.PXCN be used as a direct replacement for the 0257040.PXPV?

A: Yes. Both parts share identical current rating (40A), voltage rating (32V DC), package format (Blade ATO/ATC), melting I²t (3310), and DC cold resistance (0.00144 Ohms). The 0287040.PXCN is the direct Littelfuse equivalent with active product status.

Q: What is the significance of the dimensional variation in the BK/ATC-40?

A: The BK/ATC-40 has slightly larger dimensions (0.760" L x 0.207" W x 0.492" H) compared to the original part (0.752" L x 0.201" W x 0.484" H). This variation is within typical manufacturing tolerances for ATO/ATC blade fuses but should be verified for fit in applications with tight mechanical constraints or custom fuse holders.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 0287040.PXCN, BK/ATC-40, and APR-40A are all ROHS3 compliant, matching the compliance status of the original 0257040.PXPV.

Q: What approval certifications are available for each substitute?

A: The 0287040.PXCN carries CSA and UL approvals. The BK/ATC-40 carries UL approval. The APR-40A carries ISO and SAE approvals. Selection should be based on specific system certification requirements.

Q: Is the response time specification critical for substitution?

A: The original 0257040.PXPV specifies fast-blow response. The 0287040.PXCN does not document response time in the provided data. The BK/ATC-40 and APR-40A both specify fast-blow response, matching the original specification. Confirmation of response time characteristics for the 0287040.PXCN should be obtained from Littelfuse technical documentation if fast-blow response is a system requirement.

Q: What is the difference between direct and parametric equivalents?

A: Direct equivalents (0287040.PXCN and BK/ATC-40) are manufactured to meet identical specifications by their respective manufacturers. Parametric equivalents (APR-40A) meet all electrical and mechanical specifications but may be from different manufacturers with different approval certifications. All three are functionally equivalent for the specified 40A 32VDC automotive fuse application.