Littelfuse 0325001.H Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325001.H is a 1 A, 250 V AC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB/3AG package format. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Active alternatives with enhanced specifications and compliance certifications are available to replace this discontinued component.

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" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	16.3
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
DC Cold Resistance	0.386 Ohms

Substitute Part Grouping Explanation

Substitute parts for the 0325001.H are qualified based on 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" (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Melting I²t: 16.3 (exact match required)
Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)

The substitute parts 0325001.HXP, 0325001.MXP, and 0325001.VXP meet all critical electrical and mechanical parameters. These parts provide additional DC voltage rating capability (125 V DC) and enhanced compliance certifications while maintaining full compatibility with the original 0325001.H specifications.

Parameter Comparison

Parameter	0325001.H	0325001.HXP	0325001.MXP	0325001.VXP
Current Rating (Amps)	1 A	1 A	1 A	1 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	—	125 V	125 V	125 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)
Breaking Capacity @ Rated Voltage	100 A	100 A AC, 10 kA DC	100 A AC, 10 kA DC	100 A AC, 10 kA DC
Melting I²t	16.3	16.3	16.3	16.3
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	0.386 Ohms	0.389 Ohms	0.389 Ohms	0.389 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
Operating Temperature	—	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C

Engineering Selection Recommendations

All three substitute parts (0325001.HXP, 0325001.MXP, 0325001.VXP) are direct functional equivalents to the obsolete 0325001.H. Selection among these active alternatives should be based on the following factors:

Product Status: The 0325001.H is obsolete. All substitute parts carry active product status, ensuring long-term availability and supply chain continuity.

Compliance Certifications: The substitute parts provide expanded certification coverage (CE, CSA, PSE, UL) compared to the original part (CSA, UL), supporting broader international regulatory requirements.

RoHS Compliance: The substitute parts are ROHS3 compliant, whereas the original part is RoHS non-compliant. This is significant for applications subject to RoHS directives.

DC Voltage Rating: The substitute parts include a 125 V DC rating, providing enhanced capability for dual-voltage applications while maintaining full AC compatibility.

Operating Temperature Range: The substitute parts specify an operating temperature range of -55°C to 125°C, providing defined thermal performance parameters absent from the original part specification.

Frequently Asked Questions (FAQ)

Q: Can 0325001.HXP, 0325001.MXP, or 0325001.VXP be used as direct replacements for 0325001.H?

A: Yes. All three substitute parts meet the critical electrical and mechanical parameters of the 0325001.H: 1 A current rating, 250 V AC voltage rating, ceramic cartridge fuse type, slow-blow response, 3AB/3AG package format, and identical physical dimensions. They are mechanically and electrically interchangeable.

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

A: The 0325001.HXP, 0325001.MXP, and 0325001.VXP are parametrically equivalent. All three share identical electrical specifications, physical dimensions, and performance characteristics. Selection may be based on packaging availability, inventory status, or supplier preference.

Q: Why do the substitute parts have a DC voltage rating when the original part does not?

A: The substitute parts are specified for both AC and DC applications (250 V AC, 125 V DC), providing broader application flexibility. This enhanced specification does not affect AC-only applications and maintains full backward compatibility with the original 0325001.H.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0325001.HXP, 0325001.MXP, 0325001.VXP) are ROHS3 compliant. The original 0325001.H is RoHS non-compliant. This is relevant for applications subject to RoHS directives or customer requirements.

Q: What certifications do the substitute parts carry?

A: The substitute parts carry CE, CSA, PSE, and UL certifications. The original 0325001.H carries CSA and UL certifications. The expanded certification set supports broader international regulatory compliance.

Q: Are there any differences in DC cold resistance between the original and substitute parts?

A: The DC cold resistance of the substitute parts (0.389 Ohms) is marginally higher than the original part (0.386 Ohms). This difference is negligible for practical circuit applications and does not affect functional compatibility.

Q: Can these fuses be used in both AC and DC circuits?

A: The substitute parts are rated for both AC and DC operation (250 V AC, 125 V DC). The original 0325001.H is specified for AC operation only. For DC applications, the substitute parts provide the necessary DC voltage rating.

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