Bel Fuse Inc. 3AP 2.5 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 3AP 2.5 is a 2.5 A, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format with through-hole mounting. This component is classified as obsolete product status. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements where the original part is no longer manufactured or readily available.

Substiute Parts

3AP 2.5

Bel Fuse Inc.In Stock: 10483AP 2.5 Datasheet

Current PartRFQ

031802.5HXP

Littelfuse Inc.In Stock: 976031802.5HXP Datasheet

SimilarRFQ

031802.5MXP

Littelfuse Inc.In Stock: 791031802.5MXP Datasheet

SimilarRFQ

031802.5VXP

Littelfuse Inc.In Stock: 1017031802.5VXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3AP 2.5 are qualified based on the following critical parameters that must match or remain compatible with the original design:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (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 Inc. 318 series parts (031802.5HXP, 031802.5MXP, 031802.5VXP) meet all critical electrical and mechanical parameters. These parts are active products with current manufacturing status and improved compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse 318 series substitute parts (031802.5HXP, 031802.5MXP, 031802.5VXP) are functionally equivalent to the 3AP 2.5 for applications requiring 2.5 A, 250 V AC/DC fast-blow glass cartridge fuses in 3AB/3AG package format.

The Littelfuse substitutes offer the following advantages:

• Active product status with current manufacturing and supply chain availability
• ROHS3 compliance versus RoHS non-compliant status of the original part
• Expanded approval agency certifications including KC certification
• Consistent electrical performance across all three part variants

The 031802.5HXP, 031802.5MXP, and 031802.5VXP parts are interchangeable for direct replacement applications. Selection among these three variants should be based on packaging availability and procurement lead times, as electrical and mechanical specifications are identical.

Frequently Asked Questions (FAQ)

Q: Are the Littelfuse 318 series parts direct replacements for the Bel Fuse 3AP 2.5?

A: Yes. The 031802.5HXP, 031802.5MXP, and 031802.5VXP parts are direct replacements. All critical parameters including current rating, voltage rating, fuse type, response time, package format, and mounting type are identical. The parts are mechanically and electrically compatible.

Q: What is the difference between the three Littelfuse substitute part numbers?

A: The 031802.5HXP, 031802.5MXP, and 031802.5VXP parts have identical electrical and mechanical specifications. The differences in part numbering reflect internal Littelfuse product line designations. All three are functionally equivalent for replacement purposes.

Q: Does the lower breaking capacity of the Littelfuse parts (100 A versus 200 A) affect compatibility?

A: The breaking capacity specification indicates the maximum fault current the fuse can safely interrupt. The 100 A breaking capacity of the Littelfuse parts is sufficient for standard 2.5 A fuse applications in 250 V circuits. Application-specific requirements should be evaluated based on circuit design parameters.

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

A: Yes. The Littelfuse substitutes are ROHS3 compliant, while the original 3AP 2.5 is RoHS non-compliant. The Littelfuse parts also include KC certification in addition to CE, CSA, PSE, and UL certifications held by the original part. These represent improvements in regulatory compliance and market coverage.

Q: Can I use these substitutes in new designs?

A: Yes. The Littelfuse 318 series parts are active products suitable for new design implementations. The active product status ensures long-term availability and supply chain continuity compared to the obsolete 3AP 2.5.