3ABP 20-R Ceramic Fuse Cartridge: Equivalent & Substitute Parts

Part Overview

The 3ABP 20-R is a 20 A 250 V AC ceramic fuse cartridge manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB/3AG form factor (1/4" x 1-1/4" axial). This part is classified as obsolete. Due to its discontinued status, equivalent substitute parts from active manufacturers are necessary to maintain circuit protection functionality in applications requiring 20 A fast-blow ceramic fuse cartridges with 250 V AC rating and compatible mechanical dimensions.

Key Parameters

Parameter	Value
Current Rating	20 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3ABP 20-R is determined by the following mandatory 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: Fast 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)

All substitute parts listed below meet these core electrical and mechanical parameters. Additional parameters such as breaking capacity, melting I²t, DC voltage rating, and DC cold resistance may vary between substitutes and should be evaluated based on specific application requirements.

Parameter Comparison

Parameter	3ABP 20-R (Bel Fuse)	0324020.HXP (Littelfuse)	0324020.MX280P (Littelfuse)	0324020.MXF42P (Littelfuse)	0324020.MXP (Littelfuse)	0324020.VXP (Littelfuse)
Current Rating (A)	20	20	20	20	20	20
Voltage Rating - AC (V)	250	250	280	250	250	250
Voltage Rating - DC (V)	Not specified	125	125	Not specified	125	125
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature (°C)	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125	-55 ~ 125
Breaking Capacity @ Rated Voltage	1.5 kA	200 A AC, 10 kA DC	350 A AC, 10 kA DC	1 kA	200 A AC, 10 kA DC	1 kA AC, 10 kA DC
Melting I²t	1598	631	631	631	631	631
DC Cold Resistance (Ohms)	0.004	0.00355	0.00355	0.00355	0.00355	0.00355
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, UL	CE, CSA, PSE, UR	CE, CSA, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All five Littelfuse substitute parts (0324020.HXP, 0324020.MX280P, 0324020.MXF42P, 0324020.MXP, 0324020.VXP) satisfy the core electrical and mechanical requirements of the 3ABP 20-R. Selection among these substitutes should be based on:

Product Status: All substitute parts are active products from Littelfuse Inc., ensuring ongoing availability and supply chain continuity compared to the obsolete 3ABP 20-R.

Compliance & Certifications:

0324020.HXP, 0324020.MXF42P, 0324020.MXP, and 0324020.VXP carry CE, CSA, PSE, and UL certifications, matching the certification profile of the original part.
0324020.MX280P carries CE and UL certifications, with reduced agency coverage.
0324020.VXP includes additional KC certification.

AC Voltage Rating: 0324020.MX280P is rated for 280 V AC, providing higher voltage margin than the 250 V AC requirement. All other substitutes are rated for 250 V AC.

DC Voltage Capability: 0324020.HXP, 0324020.MXP, and 0324020.VXP include 125 V DC rating. 0324020.MXF42P does not specify DC voltage rating. 0324020.MX280P includes 125 V DC rating.

Breaking Capacity: 0324020.MX280P and 0324020.VXP offer higher breaking capacity (10 kA DC) compared to 0324020.MXF42P (1 kA) and 0324020.HXP/0324020.MXP (10 kA DC). The original 3ABP 20-R specifies 1.5 kA breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can any of these Littelfuse parts directly replace the 3ABP 20-R?

A: All five Littelfuse substitute parts meet the mandatory electrical and mechanical parameters: 20 A current rating, 250 V AC voltage rating, ceramic cartridge fuse type, fast-blow response, 3AB/3AG package form factor, and through-hole mounting. Direct mechanical and electrical substitution is supported for all five parts.

Q: What is the difference between 0324020.MX280P and the other substitutes?

A: 0324020.MX280P is rated for 280 V AC instead of 250 V AC, providing higher voltage margin. It carries CE and UL certifications only, without CSA and PSE certifications. All other electrical and mechanical parameters remain equivalent to the 250 V AC rated substitutes.

Q: Do all substitutes support DC applications?

A: 0324020.HXP, 0324020.MXP, and 0324020.VXP are rated for 125 V DC. 0324020.MX280P is also rated for 125 V DC. 0324020.MXF42P does not specify a DC voltage rating. The original 3ABP 20-R does not specify DC voltage capability. Applications requiring DC operation should use parts with explicit DC voltage ratings.

Q: What is the significance of the melting I²t difference?

A: The original 3ABP 20-R specifies melting I²t of 1598, while all Littelfuse substitutes specify 1598 melting I²t of 631. This parameter affects the thermal response characteristics of the fuse. Applications with specific I²t requirements should be evaluated against the substitute part specifications.

Q: Are all substitutes RoHS3 compliant?

A: Yes, all five Littelfuse substitute parts are ROHS3 compliant, matching the compliance status of the original 3ABP 20-R.

Q: Which substitute has the broadest certification coverage?

A: 0324020.VXP carries CE, CSA, KC, PSE, and UL certifications, providing the broadest regulatory approval coverage among the substitute options.

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