Littelfuse 0322012.H Ceramic Fuse 12A 65VAC/VDC - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0322012.H is a 12 A ceramic cartridge fuse rated for 65 V AC and 65 V DC operation. This fuse is designed for applications requiring fast-blow response characteristics and operates within the 3AB, 3AG form factor (0.250" diameter × 1.250" length). The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for seamless system integration.

Key Parameters

Parameter	Value
Current Rating	12 A
Voltage Rating - AC	65 V
Voltage Rating - DC	65 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	200A
Series	322

Substitute Part Grouping Explanation

Substitution of the obsolete 0322012.H is based on strict equivalence across the following critical parameters:

Current Rating: 12 A (exact match required)
Voltage Rating: 65 V AC / 65 V DC (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)

Three active Littelfuse alternatives meet these criteria: 0322012.HXP, 0322012.MXP, and 0322012.VXP. All three parts are manufactured by Littelfuse Inc., belong to the 322 series, and maintain identical electrical and mechanical specifications. These parts differ only in packaging configuration (all supplied in bulk) and represent direct functional equivalents suitable for direct replacement in existing designs.

Parameter Comparison

Parameter	0322012.H (Obsolete)	0322012.HXP	0322012.MXP	0322012.VXP
Current Rating (Amps)	12 A	12 A	12 A	12 A
Voltage Rating - AC	65 V	65 V	65 V	65 V
Voltage Rating - DC	65 V	65 V	65 V	65 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	200A	200A AC, 1kA DC	200A AC, 1kA DC	200A AC, 1kA DC
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Series	322	322	322	322
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	UL	CE, UL	CE, UL	CE, UL

Engineering Selection Recommendations

All three substitute parts (0322012.HXP, 0322012.MXP, 0322012.VXP) are functionally equivalent to the obsolete 0322012.H and are suitable for direct replacement. Selection among these three active alternatives should be based on:

Product Status: All three substitutes are active products with confirmed manufacturing availability, eliminating obsolescence risk associated with the original part.

Regulatory Compliance: The substitute parts carry ROHS3 compliance and dual CE/UL approvals, providing enhanced regulatory coverage compared to the original part's UL-only certification. This is particularly relevant for applications subject to European Union directives or requiring expanded compliance documentation.

Electrical Performance: The substitute parts specify enhanced breaking capacity for DC applications (1kA DC versus unspecified DC rating on the original), providing additional safety margin in DC circuit protection scenarios.

Availability: Current inventory levels across the three substitutes range from 692 to 1258 units, ensuring supply continuity for production and replacement applications.

Frequently Asked Questions (FAQ)

Q: Can 0322012.HXP, 0322012.MXP, and 0322012.VXP be used interchangeably with 0322012.H?

A: Yes. All three parts maintain identical current rating (12 A), voltage ratings (65 V AC/DC), fuse type (ceramic cartridge), response time (fast blow), and physical dimensions (0.250" Dia × 1.250" L). They are direct functional equivalents suitable for one-to-one replacement in existing applications.

Q: What is the difference between the three substitute parts?

A: The three substitutes are electrically and mechanically identical. They differ only in packaging configuration, with all three supplied in bulk packaging. Selection among them should be based on supplier availability and procurement requirements.

Q: Does the improved breaking capacity (1kA DC) on the substitutes affect compatibility?

A: No. Enhanced breaking capacity represents an improvement over the original specification and does not affect compatibility. The substitute parts will function identically in applications designed for the original 0322012.H.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0322012.HXP, 0322012.MXP, 0322012.VXP) are ROHS3 compliant, whereas the original 0322012.H is RoHS non-compliant. This compliance improvement may be required for applications subject to RoHS directives.

Q: What certifications do the substitute parts carry?

A: The substitute parts carry CE and UL approvals. The original part carried UL approval only. The expanded certification scope of the substitutes provides broader regulatory acceptance.

Q: Do the substitute parts require the same holder as the original?

A: Yes. All parts use the 3AB, 3AG form factor and require the same fuse holder. Physical installation is identical to the original design.

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