3AP 375 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 3AP 375 is a 375 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and mounting compatibility to ensure direct interchangeability in through-hole applications.

Substiute Parts

3AP 375

Bel Fuse Inc.In Stock: 11613AP 375 Datasheet

Current PartRFQ

0318.375HXP

Littelfuse Inc.In Stock: 8860318.375HXP Datasheet

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0318.375MXP

Littelfuse Inc.In Stock: 7610318.375MXP Datasheet

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0318.375VXP

Littelfuse Inc.In Stock: 11380318.375VXP Datasheet

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BK/AGC-BV-3/8

Eaton - Electronics DivisionIn Stock: 1066BK/AGC-BV-3/8 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution validity for the 3AP 375 is determined by strict equivalence across the following parameters:

• Current Rating: 375 mA (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)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)

All substitute parts listed below meet these core electrical and mechanical criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and dimensional tolerances do not preclude substitution when primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts satisfy the core electrical and mechanical requirements for direct replacement of the 3AP 375. Selection should be based on the following criteria:

Active Product Status: The Littelfuse 318 series (0318.375HXP, 0318.375MXP, 0318.375VXP) and Eaton AGC series (BK/AGC-BV-3/8) are all active products with established supply chains, whereas the 3AP 375 is obsolete.

Regulatory Compliance: The Littelfuse 318 series parts are ROHS3 compliant, meeting modern environmental standards. The Eaton AGC part and original 3AP 375 are RoHS non-compliant. For new designs or systems requiring RoHS compliance, Littelfuse 318 series substitutes are preferred.

Certification Coverage: All substitute parts carry CSA and UL certifications. The Littelfuse 318 series additionally includes CE certification. The original 3AP 375 includes PSE certification, which is not present in the substitute options.

Dimensional Tolerance: All substitute parts maintain mechanical compatibility within the 3AB/3AG package specification. Minor dimensional variations (0.003" to 0.009" in diameter and length) are within standard manufacturing tolerances and do not affect mechanical fit or electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the 0318.375HXP, 0318.375MXP, and 0318.375VXP be used interchangeably with the 3AP 375?

A: Yes. All three Littelfuse 318 series parts are direct electrical and mechanical equivalents. They share identical current rating (375 mA), voltage rating (250 V AC), package format (3AB/3AG), and response time (fast blow). The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between the Littelfuse 318 variants (HXP, MXP, VXP)?

A: The provided data indicates these three part numbers are functionally equivalent in all specified electrical and mechanical parameters. Differentiation between variants is not defined in the available technical specifications.

Q: Is the Eaton BK/AGC-BV-3/8 a suitable replacement?

A: Yes. The Eaton AGC part meets all core substitution criteria: 375 mA current rating, 250 V AC voltage rating, 3AB/3AG package, fast-blow response, and through-hole mounting. It is an active product with CSA and UL certifications. However, it lacks CE certification present in the Littelfuse alternatives.

Q: Why do the substitute parts have different breaking capacity and melting I²t values?

A: Breaking capacity and melting I²t are secondary performance characteristics that vary between manufacturers while maintaining the same primary electrical ratings. These differences do not affect substitution validity when core parameters (current, voltage, package, response time) are identical.

Q: Are there dimensional compatibility concerns with the substitute parts?

A: All substitute parts are designed for the 3AB/3AG package specification. Dimensional variations (diameter and length tolerances) are within standard manufacturing ranges and do not prevent mechanical fit in standard through-hole fuse holders.

Q: Which substitute should I select for new designs?

A: For new designs requiring modern compliance standards, the Littelfuse 318 series (0318.375HXP, 0318.375MXP, or 0318.375VXP) is recommended due to ROHS3 compliance and active product status. For legacy system maintenance where RoHS compliance is not required, any of the listed substitutes are electrically and mechanically equivalent.