Littelfuse 0287040.U 40A 32VDC Automotive Blade Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0287040.U is a 40A 32VDC automotive blade fuse in the ATOF® series, designed for automotive electrical protection applications requiring ATO/ATC holder mounting. This part is currently active in production with 992 units in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional specifications to ensure direct interchangeability in automotive fuse holder applications.

Key Parameters

Parameter	Specification
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)
Breaking Capacity @ Rated Voltage	1kA
Melting I²t	3310
Operating Temperature Range	-40°C ~ 105°C
Color	Orange
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0287040.U is determined by 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)
Size / Dimension: 0.752" L x 0.201" W x 0.484" H (exact match required)
Melting I²t: 3310 (exact match required)
Operating Temperature Range: -40°C ~ 105°C (exact match required)

All identified substitute parts meet these critical parameters and are manufactured by Littelfuse Inc. Substitutes differ in series designation (ATOF® vs. ATO®), approval agency certifications, and DC cold resistance specifications, but maintain functional equivalence for automotive fuse applications.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (DC)	Package / Case	Size (mm)	Melting I²t	Operating Temperature	DC Cold Resistance	Approval Agency	Product Status	Inventory (Pcs)
0287040.U	Littelfuse Inc.	ATOF®	40	32	Blade, ATO/ATC	19.10 x 5.10 x 12.30	3310	-40°C ~ 105°C	1.44 mOhms	—	Active	992
0257040.PXAPC	Littelfuse Inc.	ATO®	40	32	Blade, ATO/ATC	19.10 x 5.10 x 12.30	3310	-40°C ~ 105°C	0.00144 Ohms	cULus	Active	4005
0257040.PXAPCRT	Littelfuse Inc.	ATO®	40	32	Blade, ATO/ATC	19.10 x 5.10 x 12.30	3310	-40°C ~ 105°C	0.00144 Ohms	cULus	Active	7260
0287040.H	Littelfuse Inc.	ATOF®	40	32	Blade, ATO/ATC	19.10 x 5.10 x 12.30	3310	-40°C ~ 105°C	0.00144 Ohms	CSA, UL	Active	965
0287040.PXCN	Littelfuse Inc.	ATOF®	40	32	Blade, ATO/ATC	19.10 x 5.10 x 12.30	3310	-40°C ~ 105°C	0.00144 Ohms	CSA, UL	Active	93400

Engineering Selection Recommendations

All substitute parts listed are active production items from Littelfuse Inc. and maintain identical electrical and mechanical specifications to the primary part 0287040.U.

0257040.PXAPC and 0257040.PXAPCRT are ATO® series variants with cULus certification. These parts carry higher inventory availability (4005 and 7260 units respectively) and are suitable for applications requiring cULus approval.

0287040.H and 0287040.PXCN are ATOF® series variants with CSA and UL certifications. The 0287040.PXCN variant offers the highest inventory level (93400 units) and is recommended for high-volume procurement requirements.

Selection between substitute parts should be based on specific application certification requirements and inventory availability. All parts are ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts share identical current rating (40A), voltage rating (32VDC), package type (Blade, ATO/ATC), physical dimensions (19.10mm x 5.10mm x 12.30mm), and melting I²t (3310). The primary difference is series designation (ATO® vs. ATOF®) and approval agency certification (cULus vs. none listed). Functional equivalence is maintained.

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

A: Both series are automotive blade fuses with identical electrical and mechanical specifications for this 40A 32VDC application. Series designation reflects internal design variations and manufacturing processes. All listed parts are functionally equivalent for ATO/ATC holder applications.

Q: Does DC cold resistance variation affect substitution compatibility?

A: The DC cold resistance values provided (1.44 mOhms vs. 0.00144 Ohms) represent equivalent specifications expressed in different units. All parts maintain the same electrical performance characteristics required for automotive fuse applications.

Q: Which substitute part has the best availability?

A: Part 0287040.PXCN offers the highest inventory level at 93400 units in stock, followed by 0257040.PXAPCRT at 7260 units and 0257040.PXAPC at 4005 units.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed parts, including the primary part 0287040.U, are ROHS3 compliant and REACH unaffected.

Q: What certifications should I consider for my application?

A: The primary part 0287040.U carries no listed approval agency. Substitute parts offer CSA/UL certifications (0287040.H, 0287040.PXCN) or cULus certification (0257040.PXAPC, 0257040.PXAPCRT). Select based on your application's specific regulatory requirements.

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