3AB 375 Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The 3AB 375 is a 375 mA ceramic cartridge fuse rated for 250 V AC operation, manufactured by Bel Fuse Inc. This component is designed for fast-blow protection in AC circuits and requires a compatible holder (3AB or 3AG type). The part is currently listed as obsolete, making identification of active equivalent components essential for ongoing system support and procurement planning.

Substiute Parts

3AB 375

Bel Fuse Inc.In Stock: 8163AB 375 Datasheet

Current PartRFQ

0314.375HXP

Littelfuse Inc.In Stock: 9670314.375HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0314.375HXP manufactured by Littelfuse Inc. qualifies as a direct substitute based on the following critical parameters:

• Current Rating: Both parts are rated at 375 mA
• Voltage Rating - AC: Both parts are rated at 250 V AC
• Fuse Type: Both are ceramic cartridge fuses with fast-blow response
• Package / Case: Both use the 3AB/3AG form factor with identical 1/4" x 1-1/4" dimensions
• Breaking Capacity: Both rated at 35A at rated voltage
• Operating Temperature: Both operate across -55°C ~ 125°C
• Mounting: Both require compatible holders

The 0314.375HXP provides additional DC voltage capability (125 V DC) not present in the original 3AB 375, making it suitable for applications requiring dual AC/DC operation.

Parameter Comparison

Engineering Selection Recommendations

The 0314.375HXP from Littelfuse is the appropriate substitute for the obsolete 3AB 375. Selection is based on:

• Active product status ensures ongoing availability and manufacturer support
• ROHS3 compliance meets current environmental and regulatory requirements
• Identical AC voltage and current ratings ensure drop-in compatibility in AC-only applications
• Mechanical compatibility with existing 3AB/3AG holders is confirmed
• Dimensional tolerance (0.002" difference in length) is within acceptable mechanical clearance
• Lower melting I²t (0.05 vs 0.07) provides slightly faster response characteristics
• Dual AC/DC voltage rating expands application flexibility without compromising AC performance

Frequently Asked Questions (FAQ)

Q: Can the 0314.375HXP replace the 3AB 375 in existing designs?

A: Yes. Both parts share identical current ratings (375 mA), AC voltage ratings (250 V), fuse type (ceramic cartridge), response time (fast blow), and mechanical form factor (3AB/3AG, 1/4" x 1-1/4"). Physical installation in existing holders is compatible.

Q: What is the significance of the DC voltage rating on the 0314.375HXP?

A: The 0314.375HXP includes a 125 V DC rating, whereas the 3AB 375 does not specify DC operation. This additional capability allows the Littelfuse part to function in mixed AC/DC circuits. For AC-only applications, this parameter is not relevant to substitution.

Q: Are there dimensional differences between these parts?

A: The 0314.375HXP measures 0.250" Dia x 1.250" L, compared to the 3AB 375 at 0.250" Dia x 1.252" L. The 0.002" length difference is negligible for holder compatibility and does not affect mechanical fit.

Q: Why is RoHS compliance important for this substitution?

A: The 3AB 375 is RoHS non-compliant, while the 0314.375HXP is ROHS3 compliant. For new designs or systems subject to environmental regulations, the compliant substitute ensures regulatory adherence and future supply chain viability.

Q: How do the melting I²t values affect substitution?

A: The 0314.375HXP has a lower melting I²t (0.05 vs 0.07), indicating slightly faster thermal response. This difference is within the tolerance band for fast-blow ceramic fuses and does not prevent substitution in AC protection circuits.

Q: What certifications apply to both parts?

A: Both the 3AB 375 and 0314.375HXP carry CE, CSA, and UL certifications. The 3AB 375 additionally includes PSE approval. For most industrial and commercial applications, the shared certifications are sufficient for substitution.