Littelfuse 0325025.H Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325025.H is a 25A 125VAC ceramic cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse provides slow-blow response characteristics suitable for circuit protection applications requiring ceramic construction and through-hole mounting.

Key Parameters

Parameter	Value
Manufacturer Part Number	0325025.H
Manufacturer	Littelfuse Inc.
Current Rating	25 A
Voltage Rating - AC	125 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	400A
Melting I²t	1030
DC Cold Resistance	0.0024 Ohms
Product Status	Obsolete
Approval Agency	CSA, UL

Substitute Part Grouping Explanation

Substitution for the 0325025.H is determined by the following critical parameters:

Current Rating: 25 A (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (physical compatibility)
Fuse Type: Cartridge, Ceramic (construction type)
Response Time: Slow Blow (operational characteristic)
Melting I²t: 1030 (thermal performance)
DC Cold Resistance: 0.0024 Ohms (electrical characteristic)

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes: Parts with identical or higher voltage ratings that maintain all critical electrical and mechanical parameters.

Parametric Equivalents: Parts with matching electrical performance characteristics and identical package dimensions, differing only in voltage rating specifications.

Parameter Comparison

Parameter	0325025.H (Main)	0325020.HXP	0325025.HXP	0325025.MXP
Current Rating (A)	25	20	25	25
Voltage Rating - AC (V)	125	250	250	125
Voltage Rating - DC (V)	—	60	125	125
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"
Melting I²t	1030	575	1030	1030
DC Cold Resistance (Ohms)	0.0024	0.034	0.0024	0.0024
Breaking Capacity @ Rated Voltage	400A	400A AC, 500A DC	400A AC, 600A DC	400A AC, 600A DC
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL

Engineering Selection Recommendations

0325025.MXP is the primary parametric equivalent for the 0325025.H. This part maintains identical current rating (25A), AC voltage rating (125V), melting I²t (1030), and DC cold resistance (0.0024 Ohms). The 0325025.MXP is active in production, ROHS3 compliant, and carries expanded approval certifications (CE, CSA, K-MARK, PSE, UL) compared to the obsolete original part. This substitute provides direct functional replacement with enhanced regulatory compliance.

0325025.HXP is a direct manufacturer substitute with higher voltage ratings (250V AC, 125V DC) while maintaining the 25A current rating and identical melting I²t and DC cold resistance. This part is suitable for applications where higher voltage margins are acceptable or required. The 0325025.HXP is active in production and ROHS3 compliant.

0325020.HXP is not recommended as a direct substitute due to reduced current rating (20A versus 25A). This part is listed as a secondary option only for applications where 20A current protection is acceptable. The melting I²t (575) and DC cold resistance (0.034 Ohms) differ significantly from the original specification.

All active substitute parts carry ROHS3 compliance and expanded regulatory certifications, addressing the non-compliance status of the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can 0325025.MXP directly replace 0325025.H in existing designs?

A: Yes. The 0325025.MXP maintains identical current rating (25A), AC voltage rating (125V), melting I²t (1030), and DC cold resistance (0.0024 Ohms). Physical dimensions and package format (3AB, 3AG, 1/4" x 1-1/4" axial) are identical, enabling direct through-hole mounting compatibility.

Q: What is the difference between 0325025.HXP and 0325025.MXP?

A: Both parts share identical current rating (25A), melting I²t (1030), and DC cold resistance (0.0024 Ohms). The 0325025.HXP provides higher voltage ratings (250V AC, 125V DC) compared to 0325025.MXP (125V AC, 125V DC). Selection depends on circuit voltage requirements. Both are active, ROHS3 compliant, and physically compatible.

Q: Why is 0325020.HXP listed as a substitute if the current rating differs?

A: The 0325020.HXP is included as a secondary option for applications where circuit protection requirements permit 20A operation. This part shares identical package dimensions and ceramic cartridge construction. Current rating reduction represents a significant parameter change and requires circuit analysis before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All three substitute parts (0325020.HXP, 0325025.HXP, 0325025.MXP) are ROHS3 compliant. The original 0325025.H is RoHS non-compliant. Substitution addresses both obsolescence and regulatory compliance requirements.

Q: What certifications do the substitute parts carry?

A: All substitute parts carry CE, CSA, K-MARK, PSE, and UL certifications. The original 0325025.H carries only CSA and UL certifications. Expanded certification coverage supports broader regulatory and geographic application requirements.

Q: Can 0325025.HXP be used in 125V AC circuits?

A: Yes. The 0325025.HXP is rated for 250V AC operation, which encompasses 125V AC circuits. Higher voltage rating provides additional safety margin in lower-voltage applications while maintaining identical current and thermal characteristics.

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