Littelfuse 0322012.MXP Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0322012.MXP is a 12A ceramic cartridge fuse rated for 65V AC/DC operation. This fast-blow fuse is designed for applications requiring reliable overcurrent protection in low-voltage circuits. The part is currently active in production with full compliance to CE and UL standards. Substitute parts may be required due to inventory availability, supply chain considerations, or specific packaging preferences while maintaining identical electrical and mechanical performance.

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"
Breaking Capacity (AC)	200A
Breaking Capacity (DC)	1kA
Melting I²t	60
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0515 Ohms
Approval Agencies	CE, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0322012.MXP is determined by strict equivalence across the following critical parameters:

Current Rating: 12 A (exact match required)
Voltage Rating: 65V AC and 65V 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)
Breaking Capacity: 200A AC, 1kA DC (exact match required)
Melting I²t: 60 (exact match required)

The substitute part 0322012.HXP meets all these criteria and is therefore a direct parametric equivalent. Both parts are manufactured by Littelfuse Inc. within the same 322 series and share identical electrical and mechanical specifications.

Parameter Comparison

Parameter	0322012.MXP	0322012.HXP	Match
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	✓
Series	322	322	✓
Current Rating (Amps)	12 A	12 A	✓
Voltage Rating - AC	65 V	65 V	✓
Voltage Rating - DC	65 V	65 V	✓
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	✓
Response Time	Fast Blow	Fast Blow	✓
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	✓
Breaking Capacity @ Rated Voltage	200A AC, 1kA DC	200A AC, 1kA DC	✓
Melting I²t	60	60	✓
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	✓
DC Cold Resistance	0.0515 Ohms	0.0515 Ohms	✓
Approval Agency	CE, UL	CE, UL	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

Both the 0322012.MXP and 0322012.HXP are active production parts from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts may be based on inventory availability or supply chain logistics, as they are direct parametric equivalents. Both parts carry CE and UL approvals and are ROHS3 compliant, meeting regulatory requirements for their intended applications. No performance differentiation exists between these parts based on the provided specifications.

Frequently Asked Questions (FAQ)

Q: Can 0322012.HXP be used as a direct replacement for 0322012.MXP?

A: Yes. The 0322012.HXP is a direct parametric equivalent with identical current rating (12A), voltage ratings (65V AC/DC), fuse type (ceramic cartridge), response time (fast blow), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), breaking capacity (200A AC, 1kA DC), and all other electrical specifications.

Q: Are there any compatibility issues when substituting between these parts?

A: No. Both parts require the same holder type (3AB, 3AG) and have identical physical dimensions (0.250" Dia x 1.250" L). They are mechanically and electrically interchangeable.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both 0322012.MXP and 0322012.HXP carry CE and UL approvals and are ROHS3 compliant.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across -55°C to 125°C.

Q: Is there a difference in DC cold resistance between these parts?

A: No. Both parts have identical DC cold resistance of 0.0515 Ohms.

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