Equivalent & Substitute Parts for 3ABP 8 Ceramic Fuse

Part Overview

The 3ABP 8 is an 8 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB/3AG form factor applications. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and response characteristics to ensure direct compatibility without circuit redesign.

Key Parameters

Parameter	Specification
Current Rating	8 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
Size / Dimension	0.272" Dia x 1.280" L (6.90mm x 32.50mm)
Breaking Capacity @ Rated Voltage	200 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the 3ABP 8 is determined by strict equivalence across the following parameters:

Current Rating: Must be 8 A
Voltage Rating (AC): Must be 250 V minimum
Fuse Type: Must be Cartridge, Ceramic
Response Time: Must be Fast Blow
Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type: Must be Through Hole
Physical Dimensions: Must be compatible with 0.272" Dia x 1.280" L envelope

The three Littelfuse 324 series parts (0324008.HXP, 0324008.MXP, 0324008.VXP) meet all substitution criteria. These parts provide enhanced DC voltage rating (125 V DC) and superior breaking capacity compared to the original 3ABP 8, while maintaining identical AC ratings and form factor.

Parameter Comparison

Parameter	3ABP 8 (Bel Fuse)	0324008.HXP (Littelfuse)	0324008.MXP (Littelfuse)	0324008.VXP (Littelfuse)
Current Rating (Amps)	8 A	8 A	8 A	8 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	Not specified	125 V	125 V	125 V
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
Size / Dimension	0.272" Dia x 1.280" L	0.275" Dia x 1.288" L	0.275" Dia x 1.288" L	0.275" Dia x 1.288" L
Breaking Capacity @ Rated Voltage	200 A	750 A AC, 10 kA DC	750 A AC, 10 kA DC	750 A AC, 10 kA DC
Melting I²t	184	105	105	105
DC Cold Resistance	0.012 Ohms	0.0153 Ohms	0.0153 Ohms	0.0153 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three Littelfuse 324 series substitutes (0324008.HXP, 0324008.MXP, 0324008.VXP) are functionally equivalent to the 3ABP 8 for AC applications at 250 V, 8 A. Selection among these three parts should be based on:

Product Availability: 0324008.MXP offers the highest inventory level (4100 pcs), followed by 0324008.VXP (901 pcs) and 0324008.HXP (779 pcs).

Regulatory Compliance: All three substitute parts are ROHS3 compliant and carry active product status, addressing the obsolescence of the original 3ABP 8. The original part is RoHS non-compliant.

Certification Coverage: 0324008.HXP and 0324008.MXP carry CE, CSA, K-MARK, PSE, and UL approvals. 0324008.VXP carries CE, CSA, KC, PSE, and UL approvals. The original 3ABP 8 carries CE, CSA, PSE, and UL approvals.

Enhanced Performance: All substitutes provide superior breaking capacity (750 A AC, 10 kA DC versus 200 A) and DC voltage rating (125 V DC), offering improved circuit protection margins.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 324 series parts directly replace the 3ABP 8 in existing circuits?

A: Yes. The 0324008.HXP, 0324008.MXP, and 0324008.VXP maintain identical AC voltage and current ratings, response time, and 3AB/3AG form factor. Physical dimensions are within acceptable tolerance for through-hole mounting applications.

Q: What is the significance of the DC voltage rating on the substitute parts?

A: The substitute parts specify 125 V DC rating, whereas the original 3ABP 8 does not specify a DC rating. This additional specification provides expanded application flexibility for circuits operating under DC conditions without requiring circuit modification.

Q: How do the melting I²t values differ between the original and substitute parts?

A: The original 3ABP 8 has a melting I²t of 184, while the substitutes have 105. This indicates the substitute parts will respond faster to overcurrent conditions. Circuit designers must confirm this faster response time is compatible with system protection requirements.

Q: Are there differences in physical dimensions between the original and substitute parts?

A: The substitute parts measure 0.275" Dia x 1.288" L compared to the original 0.272" Dia x 1.280" L. These minor dimensional variations remain within standard 3AB/3AG form factor tolerances and do not affect through-hole mounting compatibility.

Q: Which substitute part should be selected for new designs?

A: For new designs, 0324008.MXP is recommended based on active product status, ROHS3 compliance, comprehensive certification coverage, and highest inventory availability. All three substitutes are functionally equivalent for AC applications.

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