Equivalent & Substitute Parts for 3AP 5 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 3AP 5 is a 5 A, 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in 3AB/3AG package format (1/4" x 1-1/4" axial). This part is classified as obsolete, making identification of active equivalent components essential for ongoing system support and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional performance to ensure direct circuit compatibility.

Substiute Parts

3AP 5

Bel Fuse Inc.In Stock: 9803AP 5 Datasheet

Current PartRFQ

0318005.HXP

Littelfuse Inc.In Stock: 12800318005.HXP Datasheet

DirectRFQ

0318005.MXP

Littelfuse Inc.In Stock: 28030318005.MXP Datasheet

DirectRFQ

0318005.VXP

Littelfuse Inc.In Stock: 12210318005.VXP Datasheet

DirectRFQ

BK/AGC-V-5

Eaton - Electronics DivisionIn Stock: 845BK/AGC-V-5 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AP 5 is determined by strict equivalence across the following parameters:

• Current Rating: 5 A (exact match required)
• Voltage Rating (AC): 250 V (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)
• Breaking Capacity @ Rated Voltage: 200 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below satisfy these criteria. Dimensional tolerances and resistance variations within manufacturer specifications do not affect functional substitutability.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 3AP 5 and satisfy the core substitution criteria. Selection should be based on the following factors:

Active Product Status: The Littelfuse 0318005 series (0318005.HXP, 0318005.MXP, 0318005.VXP) and Eaton BK/AGC-V-5 are all active products with confirmed current availability, whereas the original 3AP 5 is obsolete.

Regulatory Compliance: The Littelfuse 0318005 series parts carry ROHS3 compliance, meeting modern environmental standards. The Eaton BK/AGC-V-5 maintains RoHS non-compliant status, consistent with the original part. Selection should align with system-level compliance requirements.

Certification Coverage: Littelfuse 0318005 series parts include KC certification in addition to CE, CSA, PSE, and UL. Eaton BK/AGC-V-5 carries CSA and UL certifications. Verify that the selected substitute meets all required certifications for the target application region.

Inventory Availability: Littelfuse 0318005.MXP offers the highest stock level (2780 pcs), followed by 0318005.HXP (1209 pcs) and 0318005.VXP (1178 pcs). Eaton BK/AGC-V-5 has 755 pcs available.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0318005 series parts directly replace the Bel Fuse 3AP 5?

A: Yes. The 0318005.HXP, 0318005.MXP, and 0318005.VXP are direct electrical and mechanical equivalents. All three variants maintain identical current rating (5 A), voltage rating (250 V), fuse type (cartridge, glass), response time (fast blow), package format (3AB/3AG), and breaking capacity (200 A). Dimensional variations fall within acceptable manufacturing tolerances for through-hole mounting.

Q: What is the difference between 0318005.HXP, 0318005.MXP, and 0318005.VXP?

A: These three part numbers represent different packaging or distribution variants within the Littelfuse 318 series, all with identical electrical and mechanical specifications. The suffix designations (.HXP, .MXP, .VXP) indicate packaging or regional distribution differences. All three are functionally equivalent for circuit applications.

Q: Can the Eaton BK/AGC-V-5 be used as a substitute?

A: Yes. The Eaton BK/AGC-V-5 meets all core electrical and mechanical substitution criteria: 5 A current rating, 250 V voltage rating, fast-blow response, 3AB/3AG package, and 200 A breaking capacity. However, note that the melting I²t value (131.5) differs from the original 3AP 5 (63) and Littelfuse variants (50). This difference does not affect direct substitutability but may influence circuit protection timing characteristics in applications with specific I²t requirements.

Q: Are there any dimensional concerns with these substitutes?

A: All substitute parts maintain the 3AB/3AG package format and 1/4" x 1-1/4" axial dimensions required for through-hole mounting. Minor diameter and length variations (within 0.009" and 0.012" respectively) are within standard manufacturing tolerances and do not affect mechanical fit or electrical performance in standard fuse holders.

Q: Which substitute offers the best compliance for new designs?

A: The Littelfuse 0318005 series (all three variants) provides ROHS3 compliance, making them suitable for applications requiring modern environmental standards. If RoHS compliance is not a requirement, the Eaton BK/AGC-V-5 remains a valid equivalent.

Q: What certifications should I verify for my specific application?

A: Confirm that the selected substitute carries all required certifications for your target market. Littelfuse 0318005 series includes CE, CSA, KC, PSE, and UL. Eaton BK/AGC-V-5 includes CSA and UL. The original 3AP 5 included CE, CSA, PSE, and UL. Select the part whose certification set matches or exceeds your application requirements.