3ABP 1-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 3ABP 1-R is a 1 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB/3AG package format. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fast-blow response characteristic and ceramic construction provide reliable overcurrent protection in industrial and commercial applications.

Key Parameters

Parameter	Value
Current Rating	1 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 for the 3ABP 1-R is determined by strict equivalence across the following critical parameters:

Current Rating: 1 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)

The three Littelfuse 324 series parts (0324001.HXP, 0324001.MXP, 0324001.VXP) meet all substitution criteria. These parts are manufactured by Littelfuse Inc., maintain active product status, and provide enhanced DC voltage rating (125 V DC) and higher breaking capacity compared to the obsolete 3ABP 1-R.

Parameter Comparison

Parameter	3ABP 1-R (Bel Fuse)	0324001.HXP (Littelfuse)	0324001.MXP (Littelfuse)	0324001.VXP (Littelfuse)
Current Rating (Amps)	1 A	1 A	1 A	1 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	125 V	125 V	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	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"
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	35 A	100 A AC, 10 kA DC	100 A AC, 10 kA DC	100 A AC, 10 kA DC
Melting I²t	1.43	0.69	0.69	0.69
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.16 Ohms	0.189 Ohms	0.189 Ohms	0.189 Ohms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active
Approval Agency	CE, CSA, cURus, PSE	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL

Engineering Selection Recommendations

All three Littelfuse 324 series substitutes (0324001.HXP, 0324001.MXP, 0324001.VXP) are functionally equivalent to the 3ABP 1-R across all critical electrical and mechanical parameters. Selection among these three interchangeable parts should be based on availability and packaging requirements, as all three maintain identical electrical specifications and certifications.

The Littelfuse substitutes provide enhanced reliability through active product status, higher breaking capacity (100 A AC vs. 35 A), and expanded DC voltage rating (125 V DC). All substitute parts maintain compliance with CE, CSA, PSE, and UL certifications, with the addition of UL approval compared to the original part's cURus certification.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0324001 series parts directly replace the 3ABP 1-R in existing applications?

A: Yes. The 0324001.HXP, 0324001.MXP, and 0324001.VXP maintain identical current rating (1 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (fast blow), package format (3AB/3AG), and mounting type (through hole). Physical dimensions are equivalent within tolerance (0.275" Dia x 1.288" L vs. 0.272" Dia x 1.280" L).

Q: What are the differences between the three Littelfuse substitute parts?

A: The 0324001.HXP, 0324001.MXP, and 0324001.VXP are electrically and mechanically identical. Differences are limited to packaging and internal manufacturing variants. All three are interchangeable for circuit protection applications.

Q: Does the lower melting I²t value (0.69 vs. 1.43) of the Littelfuse substitutes affect compatibility?

A: The melting I²t parameter is provided for reference. Substitution compatibility is determined by matching current rating, voltage rating, fuse type, response time, package format, and mounting type. All specified parameters are equivalent.

Q: Are the Littelfuse substitutes RoHS compliant?

A: Yes. All three Littelfuse 324 series parts are ROHS3 compliant, matching the RoHS status of the original 3ABP 1-R.

Q: What certifications do the substitute parts carry?

A: The Littelfuse 0324001 series parts carry CE, CSA, PSE, and UL certifications. The original 3ABP 1-R carries CE, CSA, cURus, and PSE certifications. Both sets meet industrial and commercial safety standards.

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