Littelfuse 0325020.MX52LP Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325020.MX52LP 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. This fuse is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the main part specifications, enabling direct replacement in circuit protection applications.

Key Parameters

Parameter	Value
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
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0325020.MX52LP are identified based on the following critical 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)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

The main part 0325020.MX52LP is rated for 250 V AC only. Substitute parts 0325020.MXDP and 0325020.MXP extend the voltage rating to include 60 V DC capability while maintaining all other critical parameters. These substitutes are electrically and mechanically compatible for applications requiring AC-only or combined AC/DC operation within the specified voltage limits.

Parameter Comparison

Parameter	0325020.MX52LP	0325020.MXDP	0325020.MXP
Current Rating (Amps)	20 A	20 A	20 A
Voltage Rating - AC	250 V	250 V	250 V
Voltage Rating - DC	Not specified	60 V	60 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	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)
Breaking Capacity @ Rated Voltage	400 A	400 A AC, 500 A DC	400 A AC, 500 A DC
Melting I²t	575	1900	575
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
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)
DC Cold Resistance	0.0034 Ohms	0.0042 Ohms	0.034 Ohms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Approval Agency	CE, CSA, KC, PSE, UR	CE, CSA, UL	CE, CSA, K-MARK, PSE, UL

Engineering Selection Recommendations

All three parts—0325020.MX52LP, 0325020.MXDP, and 0325020.MXP—are Active product status and ROHS3 compliant. Selection between these parts depends on application voltage requirements:

For AC-only applications at 250 V, the 0325020.MX52LP is the primary specification. The 0325020.MXDP and 0325020.MXP are suitable substitutes when DC voltage capability (60 V DC) is required in addition to AC operation, or when inventory availability of the primary part is limited.

Approval certifications differ across the three parts. The 0325020.MX52LP carries CE, CSA, KC, PSE, and UR certifications. The 0325020.MXDP carries CE, CSA, and UL certifications. The 0325020.MXP carries CE, CSA, K-MARK, PSE, and UL certifications. Verify that the selected part meets the regulatory requirements of the target application and end-use market.

Frequently Asked Questions (FAQ)

Q: Can 0325020.MXDP or 0325020.MXP be used as direct replacements for 0325020.MX52LP in AC-only circuits?

A: Yes. Both substitute parts maintain the 20 A, 250 V AC rating, slow-blow response, ceramic cartridge construction, and 3AB/3AG package dimensions. The addition of 60 V DC rating does not affect AC-only operation.

Q: What is the difference between 0325020.MXDP and 0325020.MXP?

A: Both parts share identical electrical ratings (20 A, 250 V AC, 60 V DC) and package specifications. The primary differences are DC cold resistance (0.0042 Ohms vs. 0.034 Ohms) and melting I²t (1900 vs. 575). Approval certifications also differ: 0325020.MXDP carries CE, CSA, UL; 0325020.MXP carries CE, CSA, K-MARK, PSE, UL.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three parts use the 3AB/3AG package format with dimensions of 0.275" Dia x 1.288" L (6.99mm x 32.72mm), enabling mechanical interchangeability in through-hole mounting applications.

Q: Which certifications apply to each part?

A: 0325020.MX52LP: CE, CSA, KC, PSE, UR. 0325020.MXDP: CE, CSA, UL. 0325020.MXP: CE, CSA, K-MARK, PSE, UL. Confirm that the selected part's certifications align with your application's regulatory requirements.

Q: Are all three parts ROHS3 compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting environmental compliance standards for electronic components.

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