Littelfuse 0326001.H Ceramic Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326001.H is a 1 A, 250 V AC ceramic cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder mounting. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse provides circuit protection in applications requiring ceramic element construction with standard 1/4" x 1-1/4" form factor.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Requires Holder
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Melting I²t	16.3
DC Cold Resistance	0.386 Ohms
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 0326001.H is determined by the following critical parameters:

Current Rating: 1 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
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)
Mounting Type: Requires Holder (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse Series 326): Parts 0326001.HXP, 0326001.MXP, and 0326001.VXP maintain identical electrical and mechanical specifications while offering enhanced DC voltage ratings (125 V DC) and active product status.

Cross-Manufacturer Parametric Equivalents: Parts BK/MDA-1-R and MDA-1-R from Eaton - Electronics Division provide identical AC voltage and current ratings with matching form factor and response characteristics, though with different breaking capacity specifications.

Alternative Fuse Type: Part 0001.2524 from SCHURTER Inc. matches current, AC voltage, and form factor but uses glass construction instead of ceramic, with different thermal and breaking capacity characteristics.

Parameter Comparison

Parameter	0326001.H	0326001.HXP	0326001.MXP	0326001.VXP	BK/MDA-1-R	MDA-1-R	0001.2524
Current Rating (Amps)	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	—	125 V	125 V	125 V	—	—	63 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Glass
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"
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)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)
Breaking Capacity @ Rated Voltage	100A	100A AC, 10kA DC	100A AC, 10kA DC	100A AC, 10kA DC	35A	35A	1.5kA AC, 20kA DC
Melting I²t	16.3	16.3	16.3	16.3	0.9	0.9	2.4
DC Cold Resistance (Ohms)	0.386	0.389	0.389	0.389	0.38	0.38	—
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete
Approval Agency	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, UL	CE, CSA, UL	cURus
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	—	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	—	—	-40°C ~ 85°C

Engineering Selection Recommendations

Preferred Substitutes (Littelfuse Series 326): Parts 0326001.HXP, 0326001.MXP, and 0326001.VXP are direct manufacturer equivalents with active product status. These parts maintain identical melting I²t values (16.3) and mechanical specifications while providing enhanced DC voltage ratings (125 V DC) and expanded approval certifications (CE, CSA, PSE, UL). All three are RoHS3 compliant and offer extended operating temperature ranges (-55°C ~ 125°C). Selection among these three is based on packaging availability and inventory requirements.

Cross-Manufacturer Alternatives (Eaton MDA Series): Parts BK/MDA-1-R and MDA-1-R provide active product status with identical AC voltage and current ratings. These parts differ in breaking capacity (35A versus 100A) and melting I²t (0.9 versus 16.3), indicating faster response to overcurrent conditions. These are suitable only where the lower thermal mass and reduced breaking capacity align with circuit protection requirements.

Glass Fuse Alternative (SCHURTER 0001.2524): This part matches current and AC voltage ratings but uses glass construction with different thermal characteristics (melting I²t of 2.4) and higher breaking capacity (1.5kA AC, 20kA DC). This part is obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use 0326001.HXP, 0326001.MXP, or 0326001.VXP as direct replacements for 0326001.H?

A: Yes. These three parts are direct manufacturer equivalents with identical current rating (1 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), and form factor (3AB, 3AG, 1/4" x 1-1/4"). All three maintain the same melting I²t value (16.3) and are mechanically and electrically interchangeable. The primary differences are enhanced DC voltage ratings (125 V DC), active product status, and improved compliance certifications.

Q: What is the difference between the Littelfuse ceramic fuses and the Eaton MDA series?

A: The Littelfuse 326 series (0326001.HXP, 0326001.MXP, 0326001.VXP) and Eaton MDA series (BK/MDA-1-R, MDA-1-R) share identical current, AC voltage, and form factor specifications. The key differences are breaking capacity (100A AC for Littelfuse versus 35A for Eaton) and melting I²t (16.3 for Littelfuse versus 0.9 for Eaton). The lower melting I²t of the Eaton fuses indicates faster thermal response. Selection depends on circuit protection requirements and breaking capacity specifications.

Q: Why does 0326001.H show RoHS non-compliant status while substitutes are RoHS3 compliant?

A: The 0326001.H is an obsolete part manufactured under earlier RoHS standards. Current production equivalents (0326001.HXP, 0326001.MXP, 0326001.VXP) are manufactured to RoHS3 compliance, reflecting current environmental and regulatory requirements. For new designs and ongoing procurement, RoHS3 compliant parts are required.

Q: Can I use the SCHURTER 0001.2524 glass fuse as a substitute?

A: The 0001.2524 matches current (1 A) and AC voltage (250 V) ratings with identical form factor. However, it uses glass construction instead of ceramic, resulting in different thermal characteristics (melting I²t of 2.4 versus 16.3) and higher breaking capacity (1.5kA AC, 20kA DC versus 100A AC). This part is obsolete and should not be selected for new applications.

Q: What are the key parameters that determine fuse substitutability?

A: For the 0326001.H, substitutability is determined by: current rating (1 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (slow blow), package designation (3AB, 3AG), physical dimensions (1/4" x 1-1/4"), and mounting type (requires holder). Deviations in any of these parameters indicate a different fuse with different circuit protection characteristics.

Q: Are there any operating temperature considerations for substitution?

A: The 0326001.H does not specify an operating temperature range. The Littelfuse equivalents (0326001.HXP, 0326001.MXP, 0326001.VXP) specify -55°C ~ 125°C, providing extended temperature capability. The Eaton MDA series does not specify operating temperature. The SCHURTER 0001.2524 specifies -40°C ~ 85°C. For applications with temperature extremes, the Littelfuse equivalents provide the widest operating range.

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