Littelfuse 0257030.U Automotive Fuse 30A 32VDC ATO/ATC Blade Equivalent & Substitute Parts

Part Overview

The Littelfuse 0257030.U is a 30A 32VDC automotive blade fuse in the ATO/ATC form factor, designed for automotive electrical circuit protection. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct circuit substitution without design modification.

Key Parameters

Parameter	Value
Current Rating	30 A
Voltage Rating (DC)	32 V
Fuse Type	Automotive
Package / Case	Blade, ATO/ATC
Mounting Type	Requires Holder
Melting I²t	1510
Operating Temperature Range	-40°C ~ 105°C
DC Cold Resistance	0.00197 Ohms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0257030.U is determined by strict equivalence across the following critical parameters: current rating (30A), voltage rating (32VDC), fuse type (automotive), package form factor (Blade ATO/ATC), melting I²t characteristic (1510), operating temperature range (-40°C to 105°C), and DC cold resistance (0.00197 Ohms). All identified substitutes maintain these specifications without deviation. Substitutes are grouped by product status and series designation, reflecting manufacturing lineage and approval certifications.

Parameter Comparison

Parameter	0257030.U (Main)	0257030.PXAPC	0257030.PXAPCRT	0287030.PXCN
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	30 A	30 A	30 A	30 A
Voltage Rating - DC	32 V	32 V	32 V	32 V
Fuse Type	Automotive	Automotive	Automotive	Automotive
Package / Case	Blade, ATO/ATC	Blade, ATO/ATC	Blade, ATO/ATC	Blade, ATO/ATC
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Melting I²t	1510	1510	1510	1510
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
DC Cold Resistance	0.00197 Ohms	0.00197 Ohms	0.00197 Ohms	0.00197 Ohms
Color	Green	Green	Green	Green
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active
Series	ATO®	ATO®	ATO®	ATOF®
Approval Agency	cULus	cULus	cULus	CSA, UL

Engineering Selection Recommendations

For applications currently using the obsolete 0257030.U, direct substitution is supported by three active alternatives: 0257030.PXAPC, 0257030.PXAPCRT, and 0287030.PXCN. All three maintain identical electrical performance and mechanical compatibility.

The 0257030.PXAPC and 0257030.PXAPCRT are preferred for designs requiring continuity with the original ATO® series designation and cULus approval certification. Both parts are functionally identical and differ only in packaging configuration and inventory availability.

The 0287030.PXCN represents the current ATOF® series evolution, approved under CSA and UL certifications. This part is suitable for new designs and applications where updated series designation is acceptable. Dimensional tolerances remain within specification compatibility (0.752" L x 0.201" W x 0.484" H versus 0.750" L x 0.200" W x 0.480" H).

Frequently Asked Questions (FAQ)

Q: Can 0257030.PXAPC be used as a direct replacement for 0257030.U?

A: Yes. Both parts share identical current rating (30A), voltage rating (32VDC), melting I²t (1510), DC cold resistance (0.00197 Ohms), and operating temperature range (-40°C to 105°C). The ATO/ATC blade form factor and holder mounting requirements are identical. The primary difference is product status: 0257030.U is obsolete while 0257030.PXAPC is active.

Q: What is the difference between 0257030.PXAPCRT and 0257030.PXAPC?

A: Both parts are electrically and mechanically identical. The suffix designations reflect internal Littelfuse packaging or distribution channel coding. No functional or performance difference exists between these parts for circuit protection applications.

Q: Is 0287030.PXCN compatible with existing ATO/ATC fuse holders?

A: Yes. The 0287030.PXCN maintains the Blade ATO/ATC form factor and is designed for use with standard ATO/ATC fuse holders. Dimensional variations (0.752" L x 0.201" W x 0.484" H) fall within mechanical tolerance ranges for holder compatibility. This part represents the current ATOF® series generation.

Q: What certifications apply to these substitute parts?

A: The 0257030.PXAPC and 0257030.PXAPCRT carry cULus approval. The 0287030.PXCN carries CSA and UL approval. All three parts are ROHS3 compliant. Selection should be based on specific certification requirements of the end application.

Q: Are there inventory or lead time considerations for these substitutes?

A: The 0287030.PXCN has the highest inventory availability (60,100 pcs). The 0257030.PXAPCRT has 16,100 pcs available, and 0257030.PXAPC has 13,884 pcs available. Inventory status should be verified at time of procurement.

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