Littelfuse 0325003.H Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325003.H is a 3 A, 250 V AC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB and 3AG package formats. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	3 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
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
Breaking Capacity @ Rated Voltage	100A
Melting I²t	200
DC Cold Resistance	0.06 Ohms

Substitute Part Grouping Explanation

Substitution of the obsolete 0325003.H is based on strict equivalence across the following critical parameters:

Current Rating: 3 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" (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)
Melting I²t: 200 (exact match required)

The substitute parts 0325003.HXP, 0325003.MXP, and 0325003.VXP meet all these criteria. These active alternatives provide enhanced specifications including DC voltage rating (125 V DC) and extended operating temperature range (-55°C ~ 125°C), which represent improvements over the obsolete main part while maintaining full AC circuit compatibility.

Parameter Comparison

Parameter	0325003.H (Main)	0325003.HXP	0325003.MXP	0325003.VXP
Current Rating (Amps)	3 A	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	—	125 V	125 V	125 V
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
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)
Breaking Capacity @ Rated Voltage	100A	100A AC, 10kA DC	100A AC, 10kA DC	100A AC, 10kA DC
Melting I²t	200	200	200	200
DC Cold Resistance	0.06 Ohms	0.0605 Ohms	0.0605 Ohms	0.0605 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	—	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All three substitute parts (0325003.HXP, 0325003.MXP, 0325003.VXP) are direct functional equivalents for the obsolete 0325003.H in AC circuit applications. Selection among these active alternatives should be based on the following criteria:

Regulatory Compliance: All substitute parts are ROHS3 compliant and carry expanded international certifications (CE, CSA, K-MARK, PSE, UL). The main part 0325003.H is RoHS non-compliant, making the substitutes mandatory for new designs or systems requiring regulatory compliance.

DC Circuit Capability: The substitute parts include 125 V DC rating, enabling their use in both AC and DC applications. The main part lacks DC specification and is suitable only for AC circuits.

Availability: All three substitutes are in active production with current inventory: 0325003.HXP (1129 pcs), 0325003.MXP (1067 pcs), 0325003.VXP (720 pcs).

Certification Differences: 0325003.VXP carries KC certification in place of K-MARK; 0325003.HXP and 0325003.MXP carry identical certifications. Selection should align with target market regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can 0325003.HXP, 0325003.MXP, or 0325003.VXP be used as direct replacements for 0325003.H?

A: Yes. All three substitute parts maintain identical electrical ratings (3 A, 250 V AC), response characteristics (slow-blow), mechanical dimensions (0.275" Dia x 1.288" L), and package format (3AB, 3AG). They are mechanically and electrically interchangeable in through-hole mounting applications.

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

A: 0325003.HXP, 0325003.MXP, and 0325003.VXP are parametrically equivalent. The primary difference is certification scope: 0325003.VXP carries KC certification, while 0325003.HXP and 0325003.MXP carry K-MARK certification. All three are ROHS3 compliant and carry CE, CSA, PSE, and UL approvals.

Q: Why does the main part 0325003.H lack a DC voltage rating?

A: The 0325003.H is specified for AC applications only. The substitute parts extend functionality to include 125 V DC rating, providing broader application flexibility while maintaining AC compatibility.

Q: Are the substitute parts suitable for both AC and DC circuits?

A: Yes. The substitute parts are rated for 250 V AC and 125 V DC, making them suitable for both circuit types. The main part 0325003.H is specified for AC only.

Q: What is the significance of the operating temperature range in the substitute parts?

A: The substitute parts specify an operating temperature range of -55°C ~ 125°C, whereas the main part does not provide this specification. This extended range indicates improved thermal performance and broader environmental suitability.

Q: Are there any differences in breaking capacity between the main part and substitutes?

A: The main part specifies 100A breaking capacity at rated voltage. The substitute parts specify 100A AC and 10kA DC breaking capacity, indicating enhanced DC circuit protection capability.

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