3AP 375-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3AP 375-R is a 375 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG package format with axial through-hole mounting. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original 3AP 375-R is no longer available from the manufacturer or inventory sources.

Substiute Parts

3AP 375-R

Bel Fuse Inc.In Stock: 9803AP 375-R 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 of the 3AP 375-R is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 250 V AC (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)

All substitute parts listed below meet these core electrical and mechanical specifications. Dimensional tolerances and secondary electrical characteristics (Breaking Capacity, Melting I²t, DC Cold Resistance) are provided for engineering reference but do not disqualify 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-R. Selection among active alternatives should be based on the following factors:

Product Availability & Status: The 0318.375HXP, 0318.375MXP, 0318.375VXP (Littelfuse Inc., Series 318) and BK/AGC-BV-3/8 (Eaton - Electronics Division, Series AGC) are all active products with current manufacturing status and documented inventory availability.

Regulatory Compliance: The Littelfuse 318 series parts carry CE, CSA, and UL approvals. The Eaton AGC series carries CSA and UL approvals. The original 3AP 375-R carried CE, CSA, and cULus approvals. Selection should align with the specific regulatory requirements of the target application.

RoHS Compliance: The Littelfuse 318 series parts are ROHS3 compliant. The Eaton AGC series is RoHS non-compliant. Applications requiring RoHS compliance should specify Littelfuse alternatives.

Dimensional Tolerance: All parts conform to the 3AB/3AG package specification with nominal dimensions of 1/4" x 1-1/4" (Axial). Minor dimensional variations (0.275" Dia x 1.288" L for Littelfuse; 0.266" Dia x 1.292" L for Eaton) are within acceptable mechanical tolerances for through-hole mounting.

Frequently Asked Questions (FAQ)

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

A: Yes. All three Littelfuse parts meet the electrical and mechanical specifications of the 3AP 375-R. The differences in part number designation (HXP, MXP, VXP) reflect internal Littelfuse product line variations but do not affect functional equivalence for this application.

Q: What is the difference between the Littelfuse 318 series and the Eaton AGC series substitutes?

A: Both series meet the core electrical specifications (375 mA, 250 V AC, Fast Blow, 3AB/3AG package). The primary differences are regulatory approvals (Littelfuse includes CE; Eaton does not) and RoHS compliance status (Littelfuse is ROHS3 compliant; Eaton is non-compliant). Secondary electrical characteristics such as Breaking Capacity and Melting I²t also differ. Selection should be based on application-specific compliance requirements.

Q: Are there dimensional compatibility concerns when substituting these parts?

A: All substitute parts conform to the 3AB/3AG package standard with axial through-hole mounting. Dimensional variations are minor (within 0.009" diameter and 0.012" length tolerances) and do not affect mechanical fit in standard fuse holders designed for this package format.

Q: Why does the original 3AP 375-R have a higher Breaking Capacity (200A) than the substitutes (35A)?

A: Breaking Capacity is a secondary electrical characteristic that reflects the maximum fault current the fuse can safely interrupt. The lower Breaking Capacity of substitute parts does not affect substitution validity when the primary electrical parameters (current rating, voltage rating, response time) are identical. Application-specific fault current analysis should confirm that the substitute's Breaking Capacity is adequate for the circuit protection requirement.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring RoHS compliance and CE certification, the Littelfuse 318 series (0318.375HXP, 0318.375MXP, or 0318.375VXP) is the recommended choice. For applications with less stringent compliance requirements, the Eaton AGC series (BK/AGC-BV-3/8) is a valid alternative.