Littelfuse 0322003.MXP Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0322003.MXP is a 3 A, 250 V AC / 125 V DC ceramic fuse cartridge designed for fast-blow protection in electrical circuits. This component requires a compatible holder (3AB, 3AG format) and operates across a temperature range of -55°C to 125°C. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing maintenance, repair, and design continuity in legacy systems.

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" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	100 A
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the obsolete 0322003.MXP is determined by strict equivalence across 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)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these core electrical and mechanical parameters. Differences in series designation, breaking capacity, melting I²t, and approval agency certifications do not affect functional interchangeability within the specified electrical operating envelope.

Parameter Comparison

Parameter	0322003.MXP (Main)	0332003.HXP	0314003.HXP	0314003.MXP	0314003.VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse	Littelfuse Inc.
Series	322	332	314	314	314
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
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A AC, 10 kA DC	100 A AC, 10 kA DC	100 A AC, 10 kA DC
Melting I²t	1.89	1.89	14.6	14.6	14.6
DC Cold Resistance	0.0245 Ohms	0.0245 Ohms	0.0432 Ohms	0.0432 Ohms	0.0432 Ohms
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, cULus, PSE	CE, cULus, PSE	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All listed substitute parts satisfy the core electrical and mechanical requirements for direct replacement of the 0322003.MXP. Selection among available alternatives should be based on the following criteria:

Active Product Status: Parts 0314003.HXP, 0314003.MXP, and 0314003.VXP carry Active product status, ensuring ongoing availability and manufacturer support. These are preferred for new designs and long-term supply chain continuity.

Compliance and Certification: The 0314003 series (HXP, MXP, VXP variants) provide expanded approval agency certifications including UL, CSA, and K-MARK, offering broader regulatory acceptance across international markets compared to the obsolete 0322003.MXP and 0332003.HXP.

Enhanced Breaking Capacity: The 0314003 series offers 10 kA DC breaking capacity, compared to the 100 A specification of the main part. This enhanced capability provides additional safety margin in DC circuit protection applications.

Inventory Availability: Current stock levels are 0314003.HXP (2673 pcs), 0314003.MXP (1633 pcs), and 0314003.VXP (1132 pcs), ensuring reliable procurement for replacement and maintenance applications.

Frequently Asked Questions (FAQ)

Q: Can the 0314003 series parts directly replace the obsolete 0322003.MXP?

A: Yes. All 0314003 variants (HXP, MXP, VXP) are electrically and mechanically equivalent to the 0322003.MXP across all critical parameters: 3 A current rating, 250 V AC / 125 V DC voltage ratings, fast-blow response, and 3AB/3AG package format. Physical dimensions and holder compatibility are identical.

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

A: These three parts are parametrically equivalent and interchangeable. Differences exist only in approval agency certifications: 0314003.HXP includes K-MARK certification, 0314003.MXP includes CSA certification, and 0314003.VXP includes KC certification. Selection depends on regional regulatory requirements.

Q: Why do the 0314003 series parts have higher melting I²t values (14.6) compared to the main part (1.89)?

A: The melting I²t value indicates the thermal energy required to melt the fuse element. Higher values in the 0314003 series reflect design improvements in the newer product line while maintaining identical fast-blow response characteristics and current ratings. This does not affect functional interchangeability within the specified electrical operating envelope.

Q: Is the 0332003.HXP a suitable substitute?

A: The 0332003.HXP meets all core electrical and mechanical parameters and is functionally equivalent. However, it carries Obsolete product status, limiting long-term availability. The active 0314003 series is preferred for new applications and ongoing supply chain reliability.

Q: What holder types are compatible with these fuse cartridges?

A: All listed parts require the 3AB or 3AG holder format. Physical dimensions are standardized at 0.250" diameter x 1.250" length (6.35mm x 31.75mm). Verify holder compatibility before installation.

Q: Are these parts RoHS compliant?

A: Yes. All listed parts are ROHS3 compliant, meeting environmental and hazardous substance restrictions for electronic components.

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