Littelfuse 0326003.VXP Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326003.VXP is a 3 A ceramic fuse cartridge rated for 250 V AC and 125 V DC operation. This slow-blow cartridge fuse requires a compatible holder (3AB, 3AG format) and is designed for applications requiring reliable overcurrent protection with controlled response characteristics. The part maintains active product status with full regulatory compliance across multiple international standards. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating - AC	250 V
Voltage Rating - DC	125 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100A AC, 10kA DC
Melting I²t	200
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.0605 Ohms
RoHS Status	ROHS3 Compliant
Approval Agencies	CE, CSA, KC, PSE, UL

Substitute Part Grouping Explanation

Substitution eligibility for the 0326003.VXP is determined by strict alignment of 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 for DC applications)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required for mechanical compatibility)
Mounting Type: Requires Holder (exact match required)

Parts meeting all these criteria are classified as parametric equivalents and may be used interchangeably in applications designed for the 0326003.VXP. The Eaton BK/MDA-3-R is classified as a manufacturer-recommended alternative based on matching electrical and mechanical specifications, with noted differences in breaking capacity and melting I²t characteristics.

Parameter Comparison

Parameter	0326003.VXP (Littelfuse)	0326003.HXP (Littelfuse)	0326003.MXP (Littelfuse)	BK/MDA-3-R (Eaton)
Current Rating (Amps)	3 A	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	125 V	125 V	125 V	Not specified
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow 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"
Breaking Capacity @ Rated Voltage	100A AC, 10kA DC	100A AC, 10kA DC	100A AC, 10kA DC	200A
Melting I²t	200	200	200	12.1
DC Cold Resistance (Ohms)	0.0605	0.0605	0.0605	0.054
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agencies	CE, CSA, KC, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, UL

Engineering Selection Recommendations

The Littelfuse 0326003.HXP and 0326003.MXP are direct parametric equivalents to the 0326003.VXP, with identical electrical ratings, mechanical dimensions, response characteristics, and core approval certifications. These parts are suitable for direct substitution in all applications where the 0326003.VXP is specified.

The Eaton BK/MDA-3-R is a manufacturer-recommended alternative that matches the primary electrical and mechanical specifications. However, this part exhibits differences in breaking capacity (200A versus 100A AC) and melting I²t (12.1 versus 200), indicating different thermal response characteristics. The BK/MDA-3-R does not specify a DC voltage rating. Selection of the Eaton part should be based on application requirements for breaking capacity and thermal response, with confirmation that the absence of a specified DC rating does not conflict with circuit design parameters.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the 0326003.HXP and 0326003.MXP be used interchangeably with the 0326003.VXP?

A: Yes. Both parts are parametric equivalents with matching current ratings (3 A), voltage ratings (250 V AC, 125 V DC), fuse type (ceramic cartridge), response time (slow blow), mechanical dimensions (3AB, 3AG, 1/4" x 1-1/4"), and breaking capacity specifications. They are suitable for direct substitution.

Q: What are the key differences between the Littelfuse and Eaton substitute parts?

A: The Littelfuse 0326003.HXP and 0326003.MXP match all electrical and mechanical parameters of the 0326003.VXP. The Eaton BK/MDA-3-R differs in breaking capacity (200A versus 100A AC) and melting I²t (12.1 versus 200), reflecting different thermal response profiles. The Eaton part does not specify a DC voltage rating.

Q: Are all substitute parts compatible with 3AB and 3AG fuse holders?

A: Yes. All listed substitute parts are specified for 3AB and 3AG holder compatibility with identical mechanical dimensions of 1/4" diameter by 1-1/4" length (6.35mm x 31.75mm).

Q: Do the substitute parts maintain the same regulatory certifications?

A: The Littelfuse equivalents (0326003.HXP and 0326003.MXP) maintain CE, CSA, PSE, and UL certifications. The Eaton BK/MDA-3-R maintains CE, CSA, and UL certifications. All parts are ROHS3 compliant and REACH unaffected.

Q: What is the significance of the melting I²t difference in the Eaton part?

A: Melting I²t is a measure of the thermal energy required to melt the fuse element. The Littelfuse parts specify 200, while the Eaton part specifies 12.1. This indicates different thermal response characteristics and should be evaluated against specific circuit protection requirements.

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