Littelfuse 0322003.HXP Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0322003.HXP is a 3 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing system support and procurement. The fuse is designed for fast-blow response in applications requiring 3AB, 3AG form factor holders with 1/4" x 1-1/4" dimensions.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Voltage Rating (DC)	125 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)
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0322003.HXP is determined by the following critical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating AC: 250 V (exact match required)
Voltage Rating DC: 125 V (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)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these electrical and mechanical parameters. The primary distinction between the main part and active substitutes is product status and breaking capacity specifications.

Parameter Comparison

Parameter	0322003.HXP (Main)	0314003.HXP	0314003.MXP	0314003.VXP	0332003.HXP
Current Rating (Amps)	3 A	3 A	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	125 V	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Fast Blow	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"	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)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing procurement, the active substitute parts 0314003.HXP, 0314003.MXP, and 0314003.VXP are the preferred alternatives to the obsolete 0322003.HXP. These parts are manufactured by Littelfuse Inc. and maintain full electrical and mechanical compatibility with the original specification.

The 0314003 series parts provide enhanced breaking capacity ratings (100A AC, 10kA DC) compared to the 0322003.HXP (100A), and carry broader regulatory approvals including CSA, K-MARK, and UL certifications. The 0314003.VXP variant includes KC certification in addition to CE, CSA, PSE, and UL.

The 0332003.HXP remains an alternative but is also classified as obsolete and should not be selected for new applications. This part maintains identical electrical parameters to the 0322003.HXP but offers no advantage in terms of product lifecycle status or regulatory coverage.

Frequently Asked Questions (FAQ)

Q: Can the 0314003.HXP directly replace the 0322003.HXP in existing applications?

A: Yes. Both parts share identical current rating (3 A), voltage ratings (250 V AC, 125 V DC), fuse type (ceramic cartridge), response time (fast blow), and physical dimensions (0.250" Dia x 1.250" L). They are mechanically and electrically interchangeable in 3AB and 3AG holders.

Q: What is the difference between 0314003.HXP, 0314003.MXP, and 0314003.VXP?

A: These three parts are parametric equivalents with identical electrical and mechanical specifications. The primary differences are regulatory certifications: 0314003.HXP and 0314003.MXP carry CE, CSA, K-MARK, PSE, and UL approvals, while 0314003.VXP carries CE, CSA, KC, PSE, and UL approvals. Selection depends on regional compliance requirements.

Q: Why is the 0322003.HXP classified as obsolete?

A: The 0322003.HXP is an obsolete product from the Littelfuse 322 series. Active alternatives from the 314 series provide equivalent performance with enhanced breaking capacity and broader regulatory certifications, making them the recommended choice for all new applications.

Q: Are there any differences in melting I²t values between the main part and substitutes?

A: Yes. The 0322003.HXP and 0332003.HXP have a melting I²t of 1.89, while the 0314003 series (HXP, MXP, VXP) have a melting I²t of 14.6. This difference reflects the enhanced thermal characteristics of the active 314 series parts.

Q: What packaging options are available for the substitute parts?

A: The substitute parts 0314003.HXP, 0314003.MXP, and 0314003.VXP are supplied in bulk packaging. The original 0322003.HXP was supplied with standard packaging designation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (0314003.HXP, 0314003.MXP, 0314003.VXP, and 0332003.HXP) are ROHS3 compliant, matching the compliance status of the original 0322003.HXP.

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