3AG 375-R Fuse Equivalent & Substitute Parts

Part Overview

The 3AG 375-R is a 375 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, necessitating identification of active equivalent alternatives for continued system support and procurement. The fuse is designed for use with 3AB and 3AG holders and provides fast-blow response characteristics suitable for circuit protection applications requiring the specified current and voltage ratings.

Substiute Parts

3AG 375-R

Bel Fuse Inc.In Stock: 10323AG 375-R Datasheet

Current PartRFQ

0312.375MXP

Littelfuse Inc.In Stock: 22530312.375MXP Datasheet

DirectRFQ

0312.375HXP

Littelfuse Inc.In Stock: 11320312.375HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AG 375-R is determined by the following critical parameters:

• Current Rating: 375 mA (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" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

The substitute parts identified below meet all critical electrical and mechanical parameters. Both alternatives are manufactured by Littelfuse Inc. and maintain active product status, ensuring ongoing availability and support.

Parameter Comparison

Engineering Selection Recommendations

Both Littelfuse alternatives (0312.375MXP and 0312.375HXP) are suitable direct replacements for the obsolete 3AG 375-R. Selection between the two Littelfuse options should be based on packaging availability and procurement lead times, as both parts are electrically and mechanically equivalent.

The transition from the Bel Fuse part to either Littelfuse substitute is supported by:

• Identical electrical ratings (375 mA, 250 V AC/DC)
• Matching mechanical form factor and holder compatibility
• Equivalent regulatory certifications (CE, CSA, UL/cULus)
• ROHS3 compliance maintained across all options
• Active product status ensuring long-term availability

Frequently Asked Questions (FAQ)

Q: Can 0312.375MXP and 0312.375HXP be used interchangeably with 3AG 375-R?

A: Yes. Both Littelfuse parts meet all critical electrical and mechanical parameters required for direct substitution. Dimensional tolerances (1.252" vs 1.250" length) are within acceptable mechanical clearance for standard 3AB/3AG holder installations.

Q: What is the difference between 0312.375MXP and 0312.375HXP?

A: Both parts are electrically and mechanically identical. The designation difference reflects internal Littelfuse product line categorization. Selection should be based on packaging format (bulk) and inventory availability.

Q: Are the regulatory certifications equivalent?

A: The original part carries cULus certification, while the Littelfuse substitutes carry UL certification. Both certifications meet North American regulatory requirements. CE and CSA certifications are maintained across all three parts.

Q: Will the fuse fit existing 3AB and 3AG holders?

A: Yes. All three parts conform to the 3AB, 3AG, 1/4" x 1-1/4" package specification. The minor dimensional variation (0.002" length difference) does not affect holder compatibility.

Q: What is the lead time for obtaining substitute parts?

A: Littelfuse 0312.375MXP and 0312.375HXP are active products with established supply chains. Specific lead times should be confirmed with authorized distributors.