3AB 375-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 3AB 375-R is a 375 mA ceramic cartridge fuse rated for 250 V AC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance and component procurement. The fuse is designed for fast-blow response characteristics and requires a compatible holder for installation. Substitute parts must maintain electrical and mechanical compatibility while meeting the same safety and performance standards.

Substiute Parts

3AB 375-R

Bel Fuse Inc.In Stock: 11973AB 375-R Datasheet

Current PartRFQ

0314.375MXP

Littelfuse Inc.In Stock: 8490314.375MXP Datasheet

DirectRFQ

0314.375HXP

Littelfuse Inc.In Stock: 9670314.375HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3AB 375-R are qualified based on the following critical parameters:

• Current Rating: Must be 375 mA
• Voltage Rating - AC: Must be 250 V minimum
• Fuse Type: Must be Cartridge, Ceramic
• Response Time: Must be Fast Blow
• Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" form factor
• Operating Temperature Range: Must support -55°C ~ 125°C
• Approval Agencies: Must include CE and CSA certifications
• RoHS Compliance: Must be ROHS3 Compliant

The substitute parts identified below meet all these criteria and are manufactured by Littelfuse Inc., an active supplier with current product availability.

Parameter Comparison

Engineering Selection Recommendations

Both Littelfuse substitute parts (0314.375MXP and 0314.375HXP) are qualified replacements for the obsolete 3AB 375-R. Selection between these two Littelfuse options should be based on application requirements and availability:

0314.375MXP and 0314.375HXP are functionally equivalent for AC-only applications. Both parts maintain active product status with Littelfuse, ensuring long-term availability and supply chain continuity. Both carry CE and CSA certifications, meeting the primary regulatory requirements of the original component. The addition of UL certification on the Littelfuse parts provides expanded approval coverage compared to the original cURus certification.

For applications requiring DC voltage capability, both Littelfuse substitutes provide 125 V DC rating, which exceeds the original part's AC-only specification. The improved DC breaking capacity (10kA DC) and lower DC cold resistance (0.82 Ohms versus 2 Ohms) represent enhanced electrical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can 0314.375MXP and 0314.375HXP be used interchangeably with 3AB 375-R?

A: Yes. Both Littelfuse parts meet all critical electrical and mechanical parameters: 375 mA current rating, 250 V AC voltage rating, fast-blow response, identical package dimensions, and equivalent operating temperature range. Both are ROHS3 compliant and carry required CE and CSA certifications.

Q: What is the difference between 0314.375MXP and 0314.375HXP?

A: Both parts are electrically and mechanically identical. They share the same current rating, voltage ratings, breaking capacity, operating temperature range, and physical dimensions. Selection between them should be based on supplier availability and inventory status.

Q: Are the physical dimensions compatible with existing 3AB holders?

A: Yes. Both substitute parts use the 3AB, 3AG, 1/4" x 1-1/4" package form factor. The dimensional difference (1.252" versus 1.250" length) is within standard manufacturing tolerance and does not affect holder compatibility.

Q: Does the lower DC cold resistance of the substitute parts affect AC-only applications?

A: No. For AC-only circuits, DC cold resistance is not a functional parameter. The substitute parts' improved DC resistance (0.82 Ohms) provides better performance in applications where DC operation is present, without degrading AC performance.

Q: Are the substitute parts suitable for all applications using 3AB 375-R?

A: Both Littelfuse substitutes are suitable for applications requiring 375 mA protection at 250 V AC with fast-blow response. Verify that your application does not require the specific cURus certification if that was a mandatory requirement in your original design documentation.