Littelfuse 0326002.H Ceramic Fuse 2A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326002.H is a 2 A, 250 V AC ceramic cartridge fuse in the 326 series, designed for 3AB and 3AG holder applications with 1/4" x 1-1/4" dimensions. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available or where enhanced specifications are required.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	100A
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
DC Cold Resistance	0.12 Ohms
Melting I²t	80

Substitute Part Grouping Explanation

Substitution for the Littelfuse 0326002.H is determined by the following critical parameters:

Primary Substitution Criteria:

Current Rating: 2 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Fuse Type: Cartridge (exact match required)
Response Time: Slow Blow (exact match required)

Secondary Compatibility Parameters:

Mounting Type: Requires Holder (all substitutes maintain this requirement)
Breaking Capacity @ Rated Voltage: 100A minimum acceptable
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalents (Littelfuse 326 Series) Parts 0326002.HXP, 0326002.MXP, and 0326002.VXP meet all primary criteria and are active products with enhanced DC voltage ratings (125 V DC) and improved compliance certifications.

Category 2: Cross-Manufacturer Equivalents Part 0001.2527 (SCHURTER) and parts MDA-2-R / BK/MDA-2-R (Eaton) meet all primary criteria but differ in fuse material (glass vs. ceramic for SCHURTER) or melting I²t characteristics.

Parameter Comparison

Parameter	0326002.H (Main)	0326002.HXP	0326002.MXP	0326002.VXP	0001.2527	MDA-2-R	BK/MDA-2-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.	Eaton	Eaton
Current Rating (Amps)	2 A	2 A	2 A	2 A	2 A	2 A	2 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	125 V	125 V	125 V	63 V	Not specified	Not specified
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Glass	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	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"	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	100A AC, 10kA DC	100A AC, 10kA DC	100A AC, 10kA DC	1.5kA AC, 20kA DC	100A	100A
Melting I²t	80	80	80	80	13	8.8	8.8
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 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
DC Cold Resistance	0.12 Ohms	0.121 Ohms	0.121 Ohms	0.121 Ohms	Not specified	0.12 Ohms	0.12 Ohms
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	cURus	CE, CSA, UL	CE, CSA, UL

Engineering Selection Recommendations

Littelfuse 326 Series (0326002.HXP, 0326002.MXP, 0326002.VXP)

These three parts are direct active-status replacements for the obsolete 0326002.H. All three are functionally identical with identical electrical specifications. They provide enhanced DC voltage rating (125 V DC vs. unspecified for the main part), ROHS3 compliance, and expanded approval certifications (CE, CSA, PSE, UL). Selection among these three parts may be based on inventory availability or packaging preferences, as all three are electrically and mechanically equivalent.

SCHURTER 0001.2527

This part meets all primary substitution criteria but differs in fuse material (glass vs. ceramic) and melting I²t (13 vs. 80). The glass construction and lower melting I²t indicate different thermal response characteristics. This part is suitable for applications where glass fuse construction is acceptable and where the lower melting I²t does not conflict with circuit protection requirements. ROHS3 compliance and cURus certification are provided.

Eaton MDA-2-R and BK/MDA-2-R

Both Eaton parts are functionally equivalent ceramic fuses with identical electrical specifications to the main part. The melting I²t is lower (8.8 vs. 80), indicating faster thermal response. Both are ROHS3 compliant with CE, CSA, and UL certifications. The BK/MDA-2-R variant includes black color designation. These parts are suitable for applications where the lower melting I²t is compatible with circuit protection design.

Frequently Asked Questions (FAQ)

Q: Can I use 0326002.HXP, 0326002.MXP, or 0326002.VXP interchangeably with 0326002.H?

A: Yes. All three parts are electrically and mechanically identical with the same 2 A current rating, 250 V AC voltage rating, ceramic construction, slow-blow response, and 3AB/3AG package dimensions. The primary advantage is that all three are active products with ROHS3 compliance and expanded certifications.

Q: What is the difference between the Littelfuse ceramic fuses and the SCHURTER 0001.2527?

A: The SCHURTER 0001.2527 uses glass construction instead of ceramic and has a significantly lower melting I²t (13 vs. 80). Both meet the 2 A, 250 V AC, 3AB/3AG package requirements. The choice depends on whether glass or ceramic construction is specified for the application and whether the thermal response difference is acceptable.

Q: How do the Eaton MDA-2-R fuses compare to the Littelfuse 0326002.H?

A: Both Eaton parts (MDA-2-R and BK/MDA-2-R) are ceramic fuses with identical 2 A, 250 V AC ratings and 3AB/3AG package compatibility. The primary difference is the melting I²t (8.8 vs. 80), indicating faster thermal response in the Eaton parts. Both are ROHS3 compliant and carry CE, CSA, and UL certifications.

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

A: Yes. All substitute parts are specified for 3AB and 3AG holder applications with 1/4" x 1-1/4" dimensions. The SCHURTER 0001.2527 has a dimension of 0.250" Dia x 1.252" L, which is within acceptable tolerance for holder compatibility.

Q: Which substitute part should I choose if my application requires DC voltage protection?

A: The Littelfuse 0326002.HXP, 0326002.MXP, and 0326002.VXP all provide 125 V DC rating. The SCHURTER 0001.2527 provides 63 V DC rating. The main part (0326002.H) does not specify DC voltage rating. Select based on your application's DC voltage requirement.

Q: What is the significance of the different melting I²t values?

A: Melting I²t determines the thermal energy required to melt the fuse element. Lower values indicate faster thermal response. The main part and Littelfuse substitutes have melting I²t of 80, while Eaton parts have 8.8 and SCHURTER has 13. This affects the fuse's response time to overcurrent conditions and should be matched to circuit protection requirements.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts are ROHS3 compliant. The main part (0326002.H) is RoHS non-compliant. If RoHS compliance is required, any of the substitute parts are suitable.

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