Littelfuse 0325004.H Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325004.H is a 4 A, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB/3AG package format (1/4" x 1-1/4" axial). This part is classified as obsolete, making equivalent substitute parts necessary for ongoing circuit protection applications. Active alternatives from the same manufacturer maintain identical electrical and mechanical specifications while offering improved compliance status and extended operating temperature range.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	400 A
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
Melting I²t	9.71

Substitute Part Grouping Explanation

Substitution of the obsolete 0325004.H is based on strict electrical and mechanical parameter matching across the Littelfuse 325 series. All substitute parts maintain identical specifications for current rating (4 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), package format (3AB/3AG), and physical dimensions (0.275" Dia x 1.288" L). Breaking capacity (400 A) and melting I²t (9.71) are preserved across all alternatives.

The substitute parts—0325004.HXP, 0325004.MXP, and 0325004.VXP—are direct parametric equivalents that differ only in packaging configuration (bulk) and product status (active). These parts are suitable for direct replacement in applications requiring the specified electrical and mechanical characteristics.

Parameter Comparison

Parameter	0325004.H (Main)	0325004.HXP	0325004.MXP	0325004.VXP
Current Rating (Amps)	4 A	4 A	4 A	4 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
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" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	400 A	400 A	400 A	400 A
Melting I²t	9.71	9.71	9.71	9.71
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	0.0755 Ohms	0.0761 Ohms	0.0761 Ohms	0.0761 Ohms
Product Status	Obsolete	Active	Active	Active
Approval Agency	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts (0325004.HXP, 0325004.MXP, 0325004.VXP) are direct parametric equivalents suitable for replacing the obsolete 0325004.H in circuit protection applications. Selection among these alternatives should be based on the following factors:

Product Status: All substitute parts carry active product status, ensuring ongoing availability and manufacturer support compared to the obsolete main part.

Compliance and Certifications: The substitute parts include expanded approval agency certifications (CE, CSA, PSE, UL) compared to the main part (CSA, UL), providing broader regulatory acceptance across international markets.

RoHS Compliance: All substitute parts meet ROHS3 compliance requirements, whereas the main part is RoHS non-compliant. This is significant for applications subject to environmental regulations.

Operating Temperature Range: Substitute parts specify an operating temperature range of -55°C to 125°C, providing defined thermal operating boundaries absent from the main part specification.

DC Cold Resistance: Substitute parts exhibit 0.0761 Ohms compared to 0.0755 Ohms for the main part. This minor variation remains within acceptable tolerance for ceramic fuse cartridges and does not affect functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can 0325004.HXP, 0325004.MXP, and 0325004.VXP be used interchangeably with 0325004.H?

A: Yes. All three substitute parts maintain identical electrical specifications (4 A, 250 V AC, slow-blow response) and mechanical dimensions (3AB/3AG package, 0.275" Dia x 1.288" L). They are direct parametric equivalents suitable for one-to-one replacement in through-hole circuit protection applications.

Q: What is the difference between the three substitute parts?

A: The three substitute parts are parametrically identical. Differences are limited to packaging configuration (all supplied in bulk) and inventory availability. Selection can be based on stock availability or procurement preference.

Q: Why is the main part 0325004.H classified as obsolete?

A: Obsolescence indicates the part is no longer in active production. The substitute parts (0325004.HXP, 0325004.MXP, 0325004.VXP) are active alternatives that maintain full electrical and mechanical compatibility while offering improved compliance status and extended operating temperature specification.

Q: Are there any compatibility concerns with the substitute parts?

A: No compatibility concerns exist. The substitute parts are mechanically identical (same package format and physical dimensions) and electrically equivalent (same current rating, voltage rating, response time, and breaking capacity). They mount identically in through-hole applications.

Q: What is the significance of ROHS3 compliance on the substitute parts?

A: ROHS3 compliance indicates the substitute parts meet Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. This is required for applications subject to environmental regulations in the European Union and other jurisdictions adopting equivalent standards.

Q: How do the approval agencies differ between the main part and substitutes?

A: The main part carries CSA and UL certifications. The substitute parts include these certifications plus CE and PSE approvals, providing broader regulatory acceptance for international applications requiring multi-region compliance.

Q: Is the DC cold resistance difference between 0.0755 Ohms and 0.0761 Ohms significant?

A: No. The 0.0006 Ohm difference represents a 0.8% variation and remains within acceptable tolerance for ceramic fuse cartridges. This minor variation does not affect functional performance or circuit protection characteristics.

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