3ABP 2.5-R Equivalent & Substitute Parts

Part Overview

The 3ABP 2.5-R is a 2.5 A, 250 V AC/DC ceramic cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor. This through-hole component features fast-blow response characteristics and is designed for general-purpose circuit protection applications. The product is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing maintenance, repair, and legacy system support.

Substiute Parts

3ABP 2.5-R

Bel Fuse Inc.In Stock: 8723ABP 2.5-R Datasheet

Current PartRFQ

031802.5HXP

Littelfuse Inc.In Stock: 976031802.5HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3ABP 2.5-R is determined by strict equivalence across the following critical parameters:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 100 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Mounting Type: Through Hole (exact match required)

The primary difference between the main part and identified substitutes is the fuse element material (ceramic versus glass). Both materials are acceptable for this application when all other electrical and mechanical parameters are identical. Dimensional tolerances and physical form factor must remain within specification to ensure proper fit in existing fuse holders and circuit board layouts.

Parameter Comparison

Engineering Selection Recommendations

The 031802.5HXP from Littelfuse Inc. is a direct functional equivalent to the obsolete 3ABP 2.5-R. Both components meet identical electrical specifications (2.5 A, 250 V, fast-blow response, 100 A breaking capacity) and share the same 3AB/3AG form factor with compatible physical dimensions.

The 031802.5HXP is currently in active production status, ensuring long-term availability for replacement and new designs. It carries broader regulatory approvals (CE, CSA, KC, PSE, UL) compared to the original part, providing enhanced compliance coverage for international applications. Both parts maintain ROHS3 compliance and identical operating temperature ranges.

The substitution is mechanically and electrically valid. Dimensional variations (0.003" diameter and 0.008" length differences) fall within standard manufacturing tolerances for this component category and do not affect fit or function in standard 3AB/3AG fuse holders.

Frequently Asked Questions (FAQ)

Q: Can the 031802.5HXP replace the 3ABP 2.5-R in existing applications?

A: Yes. Both components share identical electrical ratings (2.5 A, 250 V AC/DC), response characteristics (fast-blow), breaking capacity (100 A), and physical form factor (3AB/3AG, 1/4" x 1-1/4"). Dimensional differences are within standard manufacturing tolerances and do not affect compatibility with standard fuse holders.

Q: What is the difference between ceramic and glass fuse elements?

A: The 3ABP 2.5-R uses a ceramic element, while the 031802.5HXP uses a glass element. Both materials provide equivalent electrical performance for this application. The melting I²t values differ slightly (12 versus 9.54), but both maintain the same fast-blow response classification and breaking capacity.

Q: Are there any compliance or certification differences?

A: The 031802.5HXP carries additional regulatory approvals (KC and UL) beyond those of the original part. Both components are ROHS3 compliant and meet CE, CSA, and PSE requirements. The broader certification of the substitute part provides enhanced compliance for international markets.

Q: Why is the original 3ABP 2.5-R obsolete?

A: The 3ABP 2.5-R has been discontinued by Bel Fuse Inc. The 031802.5HXP from Littelfuse Inc. remains in active production and serves as the recommended equivalent for new designs and replacement applications.

Q: Will the 031802.5HXP fit in fuse holders designed for the 3ABP 2.5-R?

A: Yes. Both components conform to the 3AB/3AG standard form factor. Physical dimensions are within acceptable tolerances (diameter: 0.272" to 0.275"; length: 1.280" to 1.288"), ensuring proper fit and electrical contact in standard fuse holders.