Littelfuse 0257040.PXAPC 40A 32VDC Automotive Blade Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0257040.PXAPC is a 40 ampere, 32 volt DC automotive blade fuse designed for ATO/ATC holder applications. This fuse is classified as Active product status and is manufactured to cULus approval standards. The part is RoHS3 compliant and operates across a temperature range of -40°C to 105°C. Substitute parts are necessary when the primary part number becomes unavailable or when alternative series options with equivalent electrical and mechanical characteristics are required for procurement flexibility.

Key Parameters

Parameter	Value
Current Rating	40 A
Voltage Rating - DC	32 V
Fuse Type	Automotive
Package / Case	Blade, ATO/ATC
Mounting Type	Requires Holder
Size / Dimension	0.752" L x 0.201" W x 0.484" H (19.10mm x 5.10mm x 12.30mm)
Melting I²t	3310
Operating Temperature Range	-40°C ~ 105°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0257040.PXAPC is determined by the following parameters:

Current Rating: 40 A (exact match required)
Voltage Rating - DC: 32 V (exact match required)
Package / Case: Blade, ATO/ATC (exact match required)
Melting I²t: 3310 (exact match required)
Operating Temperature Range: -40°C ~ 105°C (exact match required)
Size / Dimension: 0.752" L x 0.201" W x 0.484" H (exact match required)
DC Cold Resistance: 0.00144 Ohms / 1.44 mOhms (equivalent values acceptable)

All substitute parts listed maintain identical electrical performance characteristics and mechanical compatibility with ATO/ATC holder systems. Series designation (ATO® versus ATOF®) does not affect substitution eligibility when all electrical and dimensional parameters are equivalent.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating - DC (V)	Package / Case	Melting I²t	Operating Temperature (°C)	DC Cold Resistance (Ohms)	RoHS Status	Product Status
0257040.PXAPC	Littelfuse Inc.	ATO®	40	32	Blade, ATO/ATC	3310	-40 ~ 105	0.00144	ROHS3 Compliant	Active
0287040.PXCN	Littelfuse Inc.	ATOF®	40	32	Blade, ATO/ATC	3310	-40 ~ 105	0.00144	ROHS3 Compliant	Active
0257040.PXAPCRT	Littelfuse Inc.	ATO®	40	32	Blade, ATO/ATC	3310	-40 ~ 105	0.00144	ROHS3 Compliant	Active
0287040.H	Littelfuse Inc.	ATOF®	40	32	Blade, ATO/ATC	3310	-40 ~ 105	0.00144	ROHS3 Compliant	Active
0287040.U	Littelfuse Inc.	ATOF®	40	32	Blade, ATO/ATC	3310	-40 ~ 105	1.44 mOhms	ROHS3 Compliant	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and are manufactured by Littelfuse Inc. with RoHS3 compliance. Selection between the primary part number 0257040.PXAPC and substitute options should be based on inventory availability and procurement lead times, as all parts are electrically and mechanically equivalent.

The 0287040.PXCN variant carries CSA and UL approval certifications, while 0257040.PXAPC and 0257040.PXAPCRT carry cULus approval. The 0287040.U variant does not list specific approval agency designation. All variants are suitable for automotive blade fuse holder applications requiring 40A at 32VDC protection.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical current rating (40A), voltage rating (32VDC), package type (Blade, ATO/ATC), melting I²t (3310), operating temperature range (-40°C to 105°C), and physical dimensions. The series designation difference (ATOF® versus ATO®) does not affect electrical or mechanical compatibility.

Q: What is the difference between 0257040.PXAPCRT and 0257040.PXAPC?

A: Both parts are electrically and mechanically identical. The "RT" suffix in 0257040.PXAPCRT indicates a packaging or distribution variant. All critical parameters including current rating, voltage, melting I²t, and physical dimensions are equivalent.

Q: Are all substitute parts compatible with existing ATO/ATC fuse holders?

A: Yes. All listed parts conform to the Blade, ATO/ATC package specification with identical physical dimensions of 0.752" L x 0.201" W x 0.484" H (19.10mm x 5.10mm x 12.30mm), ensuring mechanical compatibility with standard automotive fuse holders.

Q: What is the significance of the DC Cold Resistance specification?

A: DC Cold Resistance of 0.00144 Ohms (1.44 mOhms) is equivalent across all substitute parts and determines the fuse's voltage drop during normal operation. This parameter is maintained within acceptable tolerance across all listed variants.

Q: Which substitute part has the highest inventory availability?

A: According to current stock levels, 0287040.PXCN maintains the highest inventory at 93,400 pieces. This part is designated as the MFR Recommended Manufacturer Part Number and offers optimal procurement availability.

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