Equivalent & Substitute Parts for 0325020.MXSPP

Part Overview

The Littelfuse 0325020.MXSPP is a 20 A, 250 V AC ceramic cartridge fuse with 3AB/3AG package configuration and slow-blow response characteristics. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The fuse is designed for through-hole mounting in 1/4" x 1-1/4" (6.99mm x 32.72mm) form factor applications requiring ceramic construction and UL/CSA/CE compliance.

Key Parameters

Parameter	Value
Current Rating	20 A
Voltage Rating - AC	250 V
Voltage Rating - DC	Not specified (AC only)
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Breaking Capacity @ Rated Voltage	400 A
Melting I²t	575
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0034 Ohms
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Approval Agencies	CE, CSA, KC, METI, UL

Substitute Part Grouping Explanation

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

Primary Matching Criteria:

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" (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Factors:

DC voltage rating (when specified in substitute) must not be lower than application requirements
Breaking capacity must meet or exceed 400 A at rated voltage
Melting I²t value of 575 is standard across all substitutes
Operating temperature range: -55°C to 125°C (consistent across all parts)
RoHS3 compliance and regulatory approvals (CE, CSA, UL minimum)

The substitute parts listed below maintain identical AC voltage and current ratings with identical physical dimensions and mounting characteristics. Variations in DC voltage ratings and DC cold resistance reflect different internal construction but do not affect AC-only applications.

Parameter Comparison

Part Number	Current (A)	Voltage AC (V)	Voltage DC (V)	Breaking Capacity AC (A)	Breaking Capacity DC (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status
0325020.MXSPP	20	250	Not specified	400	Not specified	575	0.0034	Obsolete
0325020.HXP	20	250	60	400	500	575	0.034	Active
0325020.MX52LP	20	250	Not specified	400	Not specified	575	0.0034	Active
0325020.MXDP	20	250	60	400	500	1900	0.0042	Active
0325020.MXF42P	20	250	125	400	600	575	0.0034	Active
0325020.MXF80P	20	250	Not specified	400	Not specified	575	0.0034	Active
0325020.MXP	20	250	60	400	500	575	0.034	Active
0325020.VXP	20	250	125	400	600	575	0.0034	Active

Engineering Selection Recommendations

For AC-Only Applications (Primary Recommendation): Select 0325020.MX52LP or 0325020.MXF80P. Both parts are active-status products with identical AC electrical characteristics to the obsolete 0325020.MXSPP, including 250 V AC rating, 20 A current, 400 A breaking capacity, and 0.0034 Ohms DC cold resistance. Both maintain full regulatory compliance (CE, CSA, KC, UL certifications).

For AC/DC Hybrid Applications (60 V DC Requirement): Select 0325020.MXP or 0325020.HXP. Both provide 250 V AC / 60 V DC dual-voltage capability with 400 A AC / 500 A DC breaking capacity. 0325020.MXP offers superior inventory availability (2726 units) and maintains the lower DC cold resistance specification (0.034 Ohms vs. 0.034 Ohms). Both are active-status products with CE, CSA, K-MARK, PSE, UL approvals.

For AC/DC Hybrid Applications (125 V DC Requirement): Select 0325020.VXP or 0325020.MXF42P. Both provide 250 V AC / 125 V DC dual-voltage capability with 400 A AC / 600 A DC breaking capacity. 0325020.VXP maintains the lower DC cold resistance specification (0.0034 Ohms). Both are active-status products with full regulatory compliance.

For Extended Thermal Response (Higher I²t): Select 0325020.MXDP if application requires melting I²t of 1900 (versus standard 575). This part provides 250 V AC / 60 V DC operation with active product status and CE, CSA, UL approvals.

All substitute parts maintain identical 3AB/3AG package configuration, 1/4" x 1-1/4" physical dimensions, through-hole mounting, slow-blow response, -55°C to 125°C operating temperature range, and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can 0325020.MX52LP directly replace 0325020.MXSPP in an AC-only circuit? A: Yes. Both parts share identical AC electrical specifications: 20 A current rating, 250 V AC voltage rating, 400 A breaking capacity, 575 melting I²t, and 0.0034 Ohms DC cold resistance. Physical dimensions and package configuration (3AB/3AG, 1/4" x 1-1/4") are identical. 0325020.MX52LP is active-status with CE, CSA, KC, UL approvals.

Q: What is the difference between 0325020.MXP and 0325020.HXP? A: Both parts provide identical 250 V AC / 60 V DC dual-voltage operation with 20 A current and 400 A AC / 500 A DC breaking capacity. The primary difference is DC cold resistance: 0325020.MXP specifies 0.034 Ohms while 0325020.HXP also specifies 0.034 Ohms. 0325020.MXP has higher inventory availability (2726 units vs. 831 units).

Q: Can I use a 125 V DC rated fuse (0325020.VXP or 0325020.MXF42P) in place of a 60 V DC rated fuse (0325020.MXP)? A: Yes, for AC-only applications or applications operating at DC voltages up to 60 V. The 125 V DC rating indicates higher voltage capability and does not create incompatibility at lower voltages. Physical dimensions, current rating, AC voltage rating, and breaking capacity remain identical.

Q: Why does 0325020.MXDP have a melting I²t of 1900 instead of 575? A: The melting I²t value reflects the thermal energy required to melt the fuse element. 0325020.MXDP is designed for applications requiring extended thermal response characteristics. All other electrical parameters (20 A, 250 V AC, 60 V DC, 400 A AC / 500 A DC breaking capacity) remain identical to standard variants.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with REACH Unaffected status and EAR99 ECCN classification.

Q: What is the minimum regulatory approval requirement for substitute selection? A: All substitute parts maintain CE, CSA, and UL approvals as minimum standards. Additional approvals (KC, METI, PSE, K-MARK, UR) vary by part number but do not affect core substitution eligibility for standard industrial applications.

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