Littelfuse 0325020.H Ceramic Fuse 20A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325020.H is a 20A 250VAC ceramic cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This part is classified as obsolete. Equivalent and substitute parts are available from the same manufacturer series with active product status, offering improved compliance certifications and extended operating temperature ranges while maintaining core electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	20 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Response Time	Slow Blow
Mounting Type	Through Hole
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
Breaking Capacity @ Rated Voltage	400A
Melting I²t	575

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Parameters:

Current Rating: 20 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

Voltage Rating - DC: May vary (0V, 60V, or 125V DC ratings are acceptable)
Breaking Capacity: May vary (400A or higher acceptable)
Melting I²t: May vary (575 or higher acceptable)
Operating Temperature: May vary (extended ranges acceptable)
Compliance Certifications: May vary (additional certifications acceptable)
RoHS Status: May vary (compliant status preferred)

Substitute parts maintain identical mechanical form factor and AC electrical ratings while offering enhanced DC voltage ratings, improved thermal performance, and superior regulatory compliance compared to the obsolete main part.

Parameter Comparison

Part Number	Status	Current (A)	Voltage AC (V)	Voltage DC (V)	Breaking Capacity AC (A)	Breaking Capacity DC (A)	Melting I²t	Operating Temp (°C)	RoHS
0325020.H	Obsolete	20	250	—	400	—	575	—	Non-compliant
0325020.HXP	Active	20	250	60	400	500	575	-55 to 125	ROHS3
0325020.MX52LP	Active	20	250	—	400	—	575	-55 to 125	ROHS3
0325020.MXDP	Active	20	250	60	400	500	1900	-55 to 125	ROHS3
0325020.MXF42P	Active	20	250	125	400	600	575	-55 to 125	ROHS3
0325020.MXF80P	Active	20	250	—	400	—	575	-55 to 125	ROHS3
0325020.MXP	Active	20	250	60	400	500	575	-55 to 125	ROHS3
0325020.VXP	Active	20	250	125	400	600	575	-55 to 125	ROHS3

Engineering Selection Recommendations

For AC-Only Applications (No DC Component): Select 0325020.MX52LP or 0325020.MXF80P. Both parts maintain the original 250VAC rating with identical breaking capacity and melting I²t characteristics. Both are ROHS3 compliant with extended operating temperature range (-55°C to 125°C) and active product status.

For AC/DC Mixed Applications (60V DC Maximum): Select 0325020.HXP, 0325020.MXDP, or 0325020.MXP. All three parts support 250VAC and 60VDC ratings with 400A AC and 500A DC breaking capacity. 0325020.MXDP offers elevated melting I²t (1900 vs. 575) for enhanced thermal performance. All are ROHS3 compliant with active status.

For AC/DC Mixed Applications (125V DC Maximum): Select 0325020.MXF42P or 0325020.VXP. Both parts support 250VAC and 125VDC ratings with 400A AC and 600A DC breaking capacity. Both are ROHS3 compliant with active status and extended operating temperature range.

All substitute parts are manufactured by Littelfuse Inc. within the 325 series and maintain identical mechanical form factor (3AB/3AG, 1/4" x 1-1/4" axial). Selection should be based on DC voltage requirements of the target application and required regulatory certifications.

Frequently Asked Questions (FAQ)

Q: Can 0325020.H be directly replaced with any of these substitute parts?

A: Yes, all listed substitute parts are mechanically and electrically compatible for AC applications at 250VAC, 20A. The 3AB/3AG package format and through-hole mounting are identical. For applications requiring DC voltage support, select a substitute part with appropriate DC voltage rating (60V or 125V).

Q: What is the difference between parts with and without DC voltage ratings?

A: Parts without specified DC ratings (0325020.MX52LP, 0325020.MXF80P) are suitable for AC-only circuits. Parts with 60V DC or 125V DC ratings (0325020.HXP, 0325020.MXDP, 0325020.MXF42P, 0325020.MXP, 0325020.VXP) can operate in mixed AC/DC environments up to their specified DC voltage limit. DC voltage rating does not affect AC performance.

Q: Why does 0325020.MXDP have a higher melting I²t value (1900 vs. 575)?

A: Melting I²t is a thermal characteristic that affects the fuse's response time under fault conditions. The higher value in 0325020.MXDP indicates a slower thermal response, which may be beneficial in applications with high inrush currents. Both values are acceptable substitutes; selection depends on application-specific inrush current requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts are ROHS3 compliant. The original 0325020.H is RoHS non-compliant. If RoHS compliance is required for your application, any of the substitute parts satisfy this requirement.

Q: What is the significance of the extended operating temperature range (-55°C to 125°C)?

A: All substitute parts support this extended range compared to the original part (no specified range). This allows operation in wider environmental conditions, including industrial and automotive applications with temperature extremes.

Q: Can I use a substitute part with a higher DC voltage rating in an AC-only application?

A: Yes. A part rated for 125V DC can be used in an AC-only 250VAC circuit. The DC rating does not degrade AC performance. Select based on your actual application requirements to optimize cost and availability.

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