Littelfuse 0287040.H Automotive Fuse 40A 32VDC Blade ATO Equivalent & Substitute Parts

Part Overview

The Littelfuse 0287040.H is a 40A 32VDC automotive blade fuse in the ATOF® series, designed for automotive electrical protection applications requiring a blade-type ATO/ATC holder. This fuse is active in production and maintains full compliance with RoHS3 and REACH regulations. Substitute parts are identified to support supply chain flexibility, inventory optimization, and application continuity when the primary part number becomes unavailable or when alternative series certifications are required.

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
Melting I²t	3310
Operating Temperature Range	-40°C ~ 105°C
DC Cold Resistance	0.00144 Ohms
Physical Dimensions	0.752" L x 0.201" W x 0.484" H (19.10mm x 5.10mm x 12.30mm)
Color	Orange
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0287040.H is determined by strict equivalence across 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)
Physical Dimensions: 0.752" L x 0.201" W x 0.484" H (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these criteria. Variations in series designation (ATOF® vs. ATO®), approval agency certifications, and breaking capacity specifications do not affect functional interchangeability within the specified electrical and mechanical parameters.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (DC)	Package / Case	Melting I²t	Operating Temperature	DC Cold Resistance (Ohms)	Dimensions (mm)	Product Status	Inventory (Pcs)
0287040.H	Littelfuse Inc.	ATOF®	40	32 V	Blade, ATO/ATC	3310	-40°C ~ 105°C	0.00144	19.10 x 5.10 x 12.30	Active	965
0257040.PXAPC	Littelfuse Inc.	ATO®	40	32 V	Blade, ATO/ATC	3310	-40°C ~ 105°C	0.00144	19.10 x 5.10 x 12.30	Active	4005
0257040.PXAPCRT	Littelfuse Inc.	ATO®	40	32 V	Blade, ATO/ATC	3310	-40°C ~ 105°C	0.00144	19.10 x 5.10 x 12.30	Active	7260
0287040.PXCN	Littelfuse Inc.	ATOF®	40	32 V	Blade, ATO/ATC	3310	-40°C ~ 105°C	0.00144	19.10 x 5.10 x 12.30	Active	93400
0287040.U	Littelfuse Inc.	ATOF®	40	32 V	Blade, ATO/ATC	3310	-40°C ~ 105°C	0.00144	19.10 x 5.10 x 12.30	Active	992

Engineering Selection Recommendations

All substitute parts listed are active production items from Littelfuse Inc. and maintain full RoHS3 and REACH compliance. Selection among equivalent parts should be based on:

Approval agency requirements: 0287040.H, 0287040.PXCN, and 0287040.U carry CSA/UL or equivalent certifications; 0257040.PXAPC and 0257040.PXAPCRT carry cULus certification.
Inventory availability: 0287040.PXCN offers the highest stock level (93,400 pcs), followed by 0257040.PXAPCRT (7,260 pcs) and 0257040.PXAPC (4,005 pcs).
Breaking capacity specification: 0257040.PXAPC, 0257040.PXAPCRT, and 0287040.U specify 1kA breaking capacity; 0287040.H and 0287040.PXCN do not specify this parameter.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical electrical ratings (40A, 32VDC), mechanical dimensions (19.10mm x 5.10mm x 12.30mm), melting I²t (3310), and operating temperature range (-40°C ~ 105°C). The series designation difference (ATO® vs. ATOF®) and approval agency variation do not affect functional interchangeability within the specified parameters.

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

A: Series designation reflects internal design and certification lineage. Both series meet the same electrical and mechanical specifications for this 40A 32VDC application. Selection between series should be based on specific approval agency requirements for the end application.

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

A: Yes. All parts use the Blade, ATO/ATC package and share identical physical dimensions (0.752" L x 0.201" W x 0.484" H), ensuring mechanical compatibility with standard automotive blade fuse holders.

Q: Which substitute part has the best inventory availability?

A: 0287040.PXCN offers the highest stock level at 93,400 pcs, making it the preferred choice for high-volume applications or when supply chain continuity is a priority.

Q: Do all substitute parts have the same DC cold resistance?

A: Yes. All parts specify 0.00144 Ohms DC cold resistance, ensuring equivalent electrical performance in circuit protection applications.

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