Equivalent & Substitute Parts for 3ABP 750 Ceramic Fuse

Part Overview

The 3ABP 750 is a 750 mA, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. in the 3AB, 3AG form factor (1/4" x 1-1/4" axial). This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The substitute parts listed maintain electrical and mechanical compatibility while offering active product status and improved compliance certifications.

Substiute Parts

3ABP 750

Bel Fuse Inc.In Stock: 8163ABP 750 Datasheet

Current PartRFQ

0324.750HXP

Littelfuse Inc.In Stock: 8650324.750HXP Datasheet

DirectRFQ

0324.750MXP

Littelfuse Inc.In Stock: 10410324.750MXP Datasheet

DirectRFQ

0324.750VXP

Littelfuse Inc.In Stock: 8750324.750VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3ABP 750 is determined by the following critical parameters:

• Current Rating: Must be 750 mA
• Voltage Rating - AC: Must be 250 V
• 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
• Operating Temperature Range: Must support -55°C ~ 125°C

All three substitute parts (0324.750HXP, 0324.750MXP, 0324.750VXP) from Littelfuse Inc. meet these core requirements. The substitutes provide additional DC voltage rating capability (125 V DC) not specified in the original part, enhanced breaking capacity for DC applications (10kA DC), and improved RoHS3 compliance status.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0324.750HXP, 0324.750MXP, 0324.750VXP) are direct functional equivalents for the obsolete 3ABP 750. Selection among these three substitutes should be based on:

Product Status: All substitutes carry Active product status, ensuring long-term availability and supply chain continuity compared to the obsolete original part.

Compliance Certifications: The substitute parts maintain CE, CSA, and UL certifications consistent with the original. The substitutes achieve ROHS3 compliance, whereas the original is RoHS non-compliant. This compliance improvement is significant for applications subject to environmental regulations.

Electrical Performance: The substitutes provide identical AC voltage and current ratings. The addition of 125 V DC rating and 10kA DC breaking capacity in the substitutes extends application flexibility without compromising AC performance. The melting I²t value of 0.466 in substitutes differs from the original 0.75, reflecting the ceramic fuse design characteristics of the active product line.

Physical Compatibility: Dimensional variations between the original (0.272" Dia x 1.280" L) and substitutes (0.275" Dia x 1.288" L) are within typical mechanical tolerances for 3AB, 3AG form factor fuses and do not affect through-hole mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Are the Littelfuse 0324.750HXP, 0324.750MXP, and 0324.750VXP parts fully interchangeable with the 3ABP 750?

A: Yes. All three substitute parts meet the core electrical and mechanical requirements: 750 mA current rating, 250 V AC voltage rating, fast-blow response, 3AB/3AG package form factor, and through-hole mounting. Physical dimensions are within acceptable tolerances for the form factor.

Q: What is the difference between the three Littelfuse substitute options?

A: The 0324.750HXP, 0324.750MXP, and 0324.750VXP parts are electrically and mechanically identical. All three are from the Littelfuse 324 series, carry Active product status, and meet the same certifications and performance specifications. Selection may be based on packaging availability or supplier inventory.

Q: Why do the substitute parts have a lower melting I²t value (0.466 vs. 0.75)?

A: The melting I²t value reflects the thermal characteristics of the ceramic fuse element design. The substitutes, being from an active product line, incorporate current ceramic fuse technology. Both values are within the specification range for 750 mA fast-blow fuses and do not affect functional compatibility in applications designed for the original part.

Q: Do the substitute parts support DC applications?

A: The substitute parts are rated for 125 V DC with a 10kA DC breaking capacity, whereas the original 3ABP 750 does not specify DC ratings. This makes the substitutes suitable for both AC and DC applications. However, if the original application is AC-only, the DC rating does not affect performance.

Q: Are there any compliance differences between the original and substitute parts?

A: The original 3ABP 750 is RoHS non-compliant, while all three Littelfuse substitutes are ROHS3 compliant. Both maintain CE, CSA, and UL certifications. The improved RoHS compliance of the substitutes is advantageous for applications subject to environmental regulations.

Q: Can I use these substitutes in existing PCB designs without modification?

A: Yes. The 3AB, 3AG through-hole package form factor and physical dimensions are compatible with existing fuse holders and PCB layouts. Minor dimensional variations (approximately 0.003" in diameter and 0.008" in length) are within standard mechanical tolerances and do not require design changes.