Littelfuse 0326005.H Ceramic Fuse 5A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326005.H is a 5A 250VAC ceramic cartridge fuse in the 326 series, designed for 3AB/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 active product variants with improved compliance are preferred.

Key Parameters

Parameter	Value
Current Rating	5 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	400A
Melting I²t	25
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
DC Cold Resistance	0.0518 Ohms

Substitute Part Grouping Explanation

Substitution for the 0326005.H is determined by strict equivalence across the following parameters:

Current Rating: 5 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)
Breaking Capacity @ Rated Voltage: 400A (exact match required)
Melting I²t: 25 (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse 326 Series): Parts 0326005.HXP, 0326005.MXCCP, and 0326005.MXP are active product variants from Littelfuse with identical electrical and mechanical specifications. These parts differ only in packaging designation and compliance certifications.

Cross-Manufacturer Parametric Equivalents: Parts 0001.2531 (SCHURTER), BK/MDA-5-R (Eaton), and MDA-5-R (Eaton) meet the core electrical parameters but differ in fuse material composition, breaking capacity, melting I²t, or DC cold resistance. These parts are suitable only where application requirements permit deviation from the original specifications.

Parameter Comparison

Parameter	0326005.H	0326005.HXP	0326005.MXCCP	0326005.MXP	0326005.VXP	0001.2531	BK/MDA-5-R	MDA-5-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.	Eaton - Electronics Division	Eaton - Electronics Division
Current Rating (Amps)	5 A	5 A	5 A	5 A	5 A	5 A	5 A	5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	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	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"	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	400A	400A	400A	400A	400A	1.5kA AC, 20kA DC	200A	200A
Melting I²t	25	25	25	25	25	127	65	65
DC Cold Resistance (Ohms)	0.0518	0.0522	0.0522	0.0522	0.0522	Not specified	0.023	0.023
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	Not specified	Not specified
Approval Agency	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	cURus	CE, CSA, UL	CE, CSA, UL

Engineering Selection Recommendations

Preferred Substitutes (Littelfuse 326 Series):

Parts 0326005.HXP, 0326005.MXCCP, 0326005.MXP, and 0326005.VXP are direct functional equivalents manufactured by Littelfuse. These parts maintain identical electrical and mechanical specifications to the 0326005.H while offering active product status and ROHS3 compliance. Selection among these four variants depends on packaging requirements and regional certification needs. All four parts carry CE, CSA, PSE, and UL approvals, providing broader regulatory coverage than the original part.

Cross-Manufacturer Alternatives:

The SCHURTER 0001.2531 is a glass cartridge fuse with identical current, voltage, and package specifications. However, the glass construction results in significantly higher melting I²t (127 vs. 25) and breaking capacity (1.5kA AC, 20kA DC vs. 400A). This part is suitable only for applications where higher energy absorption and breaking capacity are acceptable or beneficial.

The Eaton MDA-5-R and BK/MDA-5-R ceramic fuses meet the core electrical parameters but exhibit lower breaking capacity (200A vs. 400A) and higher melting I²t (65 vs. 25). These parts are suitable only where the application circuit design accommodates reduced breaking capacity and altered thermal response characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use 0326005.HXP, 0326005.MXCCP, 0326005.MXP, or 0326005.VXP as direct replacements for 0326005.H?

A: Yes. These four Littelfuse parts are parametrically identical to the 0326005.H across all critical electrical and mechanical parameters: 5A current rating, 250V AC voltage rating, ceramic cartridge construction, slow-blow response, 3AB/3AG package, 400A breaking capacity, and 25 melting I²t. All four are active products with ROHS3 compliance and enhanced regulatory certifications.

Q: What is the difference between the four Littelfuse substitute parts?

A: The parts 0326005.HXP, 0326005.MXCCP, 0326005.MXP, and 0326005.VXP are electrically and mechanically identical. Differences exist only in packaging designation and internal product line classification. Selection should be based on packaging availability and supplier inventory.

Q: Can I use the SCHURTER 0001.2531 glass fuse as a substitute?

A: The 0001.2531 meets the current, voltage, and package requirements but differs in fuse material (glass vs. ceramic) and thermal characteristics. The melting I²t is significantly higher (127 vs. 25), and breaking capacity is substantially higher (1.5kA AC, 20kA DC vs. 400A). This part is suitable only if the application circuit design permits these deviations and if glass construction is acceptable for the intended environment.

Q: Can I use the Eaton MDA-5-R or BK/MDA-5-R as substitutes?

A: These Eaton ceramic fuses meet the current, voltage, and package specifications but have lower breaking capacity (200A vs. 400A) and higher melting I²t (65 vs. 25). Use these parts only if the application circuit design accommodates reduced breaking capacity and altered thermal response. The lower breaking capacity may be insufficient for circuits with high fault current potential.

Q: What does "breaking capacity" mean, and why does it matter?

A: Breaking capacity is the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The 0326005.H has a 400A breaking capacity at 250V AC. Substitutes with lower breaking capacity (such as the Eaton parts at 200A) may fail catastrophically in high-fault-current circuits. Substitutes with higher breaking capacity (such as the SCHURTER at 1.5kA AC) provide additional safety margin but may alter circuit protection characteristics.

Q: What does "melting I²t" mean?

A: Melting I²t is a measure of the thermal energy required to melt the fuse element, expressed in ampere-squared-seconds (A²s). The 0326005.H has a melting I²t of 25. Higher values (such as 65 for Eaton or 127 for SCHURTER) indicate slower thermal response and delayed fuse operation. Lower values indicate faster response. Substitutes with different melting I²t values will alter the circuit protection timing and may not provide equivalent protection for sensitive equipment.

Q: Are all substitute parts RoHS compliant?

A: The 0326005.H is RoHS non-compliant. All substitute parts listed (0326005.HXP, 0326005.MXCCP, 0326005.MXP, 0326005.VXP, 0001.2531, BK/MDA-5-R, and MDA-5-R) are ROHS3 compliant, meeting current environmental regulations.

Q: What certifications do the substitute parts carry?

A: The Littelfuse substitutes (0326005.HXP, 0326005.MXCCP, 0326005.MXP, 0326005.VXP) carry CE, CSA, PSE, and UL approvals. The SCHURTER 0001.2531 carries cURus approval. The Eaton parts (MDA-5-R and BK/MDA-5-R) carry CE, CSA, and UL approvals. Verify that the selected substitute meets the regulatory requirements for your specific application and region.

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