Littelfuse 0325020.MXF48SPP Ceramic Fuse 20A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325020.MXF48SPP is a 20 A, 250 V AC 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. Equivalent and substitute parts are available from the same manufacturer series to support ongoing system requirements and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	0325020.MXF48SPP
Manufacturer	Littelfuse Inc.
Series	325
Current Rating	20 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	400A
Melting I²t	575
Operating Temperature Range	-55°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0325020.MXF48SPP is determined by the following critical parameters:

Core Compatibility Parameters:

Current Rating: 20 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)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

Secondary Compatibility Parameters:

Breaking Capacity @ Rated Voltage: 400A minimum
Melting I²t: 575 or higher
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on DC voltage rating capability:

Group 1 - AC Only (No DC Rating): Parts with 250 V AC rating and no specified DC voltage rating. These are direct functional equivalents for AC-only applications.

Group 2 - AC/DC Dual Rating: Parts with 250 V AC and specified DC voltage ratings (60 V DC or 125 V DC). These provide extended application flexibility for mixed AC/DC circuit environments.

Parameter Comparison

Part Number	Current (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC (A)	Breaking Capacity DC (A)	Melting I²t	Product Status	DC Cold Resistance (Ω)
0325020.MXF48SPP	20	250	—	Slow Blow	400	—	575	Obsolete	0.0034
0325020.HXP	20	250	60	Slow Blow	400	500	575	Active	0.034
0325020.MX52LP	20	250	—	Slow Blow	400	—	575	Active	0.0034
0325020.MXDP	20	250	60	Slow Blow	400	500	1900	Active	0.0042
0325020.MXF42P	20	250	125	Slow Blow	400	600	575	Active	0.0034
0325020.MXF80P	20	250	—	Slow Blow	400	—	575	Active	0.0034
0325020.MXP	20	250	60	Slow Blow	400	500	575	Active	0.034
0325020.VXP	20	250	125	Slow Blow	400	600	575	Active	0.0034

Engineering Selection Recommendations

For AC-Only Applications (Direct Replacement):

0325020.MXF80P and 0325020.MX52LP are the primary substitutes for AC-only circuit environments. Both parts maintain identical electrical specifications to the original 0325020.MXF48SPP (20 A, 250 V AC, 400 A breaking capacity, 575 melting I²t) and are classified as active products. 0325020.MXF80P carries identical approval certifications (CE, CSA, KC, METI, UL) to the original part. 0325020.MX52LP carries equivalent certifications (CE, CSA, KC, PSE, UR) with active product status.

For AC/DC Applications (Extended Capability):

When DC voltage protection is required, four active substitute options are available:

0325020.MXF42P and 0325020.VXP both support 250 V AC and 125 V DC with 600 A DC breaking capacity. These parts are identical in electrical performance and carry full UL, CSA, and CE certifications. Selection between these two is based on procurement availability.

0325020.HXP and 0325020.MXP both support 250 V AC and 60 V DC with 500 A DC breaking capacity. These parts are functionally equivalent and carry full UL, CSA, and CE certifications. 0325020.MXP has higher inventory availability (2726 pcs).

0325020.MXDP supports 250 V AC and 60 V DC with 500 A DC breaking capacity and elevated melting I²t of 1900 (compared to 575 in other parts). This part is suitable for applications requiring enhanced thermal energy absorption. Certifications include CE, CSA, and UL.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and operating temperature range of -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can 0325020.MXF80P or 0325020.MX52LP be used as direct replacements for 0325020.MXF48SPP?

A: Yes. Both parts are functionally equivalent for AC-only applications. They maintain identical current rating (20 A), AC voltage rating (250 V), response time (slow blow), package format (3AB/3AG, 1/4" x 1-1/4" axial), and breaking capacity (400 A). Both are active products with current manufacturing status.

Q: What is the difference between the AC-only substitutes and the AC/DC substitutes?

A: AC-only substitutes (0325020.MXF80P, 0325020.MX52LP) are rated for 250 V AC only and do not specify a DC voltage rating. AC/DC substitutes carry both AC and DC voltage ratings. Selection depends on whether the circuit contains DC voltage components. If DC voltage is present in the circuit, an AC/DC rated substitute must be used.

Q: Which AC/DC substitute should I select?

A: Selection depends on the DC voltage present in your circuit. For circuits with DC voltage up to 60 V, use 0325020.HXP, 0325020.MXP, or 0325020.MXDP. For circuits with DC voltage up to 125 V, use 0325020.MXF42P or 0325020.VXP. All parts maintain 20 A current rating and 250 V AC rating. 0325020.MXDP is specified for applications requiring higher thermal energy absorption (melting I²t of 1900 versus 575).

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1).

Q: What certifications do the substitute parts carry?

A: All substitute parts carry CE and CSA certifications. UL certification is present on all parts. Additional regional certifications vary by part number: KC (Korea), PSE (Japan), K-MARK (Korea), and METI (Japan) are present on select parts. Refer to the parameter comparison table for specific certification details by part number.

Q: Can I use a substitute part with a higher DC voltage rating in a lower DC voltage application?

A: Yes. A part rated for 125 V DC can be used in a 60 V DC circuit. A part rated for 60 V DC cannot be used in a 125 V DC circuit. Always select a substitute part with a DC voltage rating equal to or greater than the maximum DC voltage present in your circuit.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Higher values indicate greater thermal energy absorption capacity. Most substitutes carry a melting I²t of 575. 0325020.MXDP carries 1900, providing enhanced thermal performance for applications with higher inrush currents or thermal stress conditions.

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