3AB 750-R Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The 3AB 750-R is a 750 mA ceramic fuse cartridge rated for 250 V AC operation, manufactured by Bel Fuse Inc. This fast-blow cartridge fuse requires a compatible holder and is designed for circuit protection in AC applications. The part maintains active product status with 1809 units in current inventory. Substitute parts are identified to provide alternative sourcing options where equivalent electrical and mechanical specifications are met.

Substiute Parts

3AB 750-R

Bel Fuse Inc.In Stock: 19053AB 750-R Datasheet

Current PartRFQ

0314.750MXP

Littelfuse Inc.In Stock: 26360314.750MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0314.750MXP manufactured by Littelfuse Inc. qualifies as a direct substitute for the 3AB 750-R based on the following critical parameters:

• Current Rating: Both parts are rated at 750 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, 1/4" x 1-1/4" form factor
• Breaking Capacity: Both rated at 35A at rated voltage
• Operating Temperature: Both operate across -55°C ~ 125°C
• RoHS Compliance: Both are ROHS3 compliant

The 0314.750MXP provides additional DC voltage capability (125 V DC) not present in the 3AB 750-R specification, making it suitable for applications requiring dual AC/DC rated protection.

Parameter Comparison

Engineering Selection Recommendations

Both the 3AB 750-R and 0314.750MXP maintain active product status and meet international compliance requirements. The 3AB 750-R carries CE, CSA, and cURus certifications, while the 0314.750MXP carries CE, CSA, and UL certifications. Selection between these parts should be based on specific application requirements and existing certification documentation for the end equipment.

The 0314.750MXP offers expanded voltage capability with DC rating support, making it suitable for applications requiring dual AC/DC protection. The 3AB 750-R remains the specified part for AC-only applications where the original certification pathway is required.

Frequently Asked Questions (FAQ)

Q: Can the 0314.750MXP be used as a direct replacement for the 3AB 750-R in AC-only circuits?

A: Yes. Both parts share identical AC voltage rating (250 V), current rating (750 mA), fuse type (ceramic cartridge), response time (fast-blow), and physical package dimensions (3AB, 3AG, 1/4" x 1-1/4"). The mechanical and electrical compatibility for AC operation is established.

Q: What is the significance of the different Melting I²t values?

A: The Melting I²t value (0.75 for 3AB 750-R versus 0.466 for 0314.750MXP) indicates the thermal energy required to melt the fuse element. The lower value for the 0314.750MXP indicates faster thermal response under fault conditions. Both values are within the ceramic cartridge fuse category specifications.

Q: Are both parts physically interchangeable in the same holder?

A: Yes. Both parts use the identical 3AB, 3AG, 1/4" x 1-1/4" package specification and are designed for the same holder configuration. Physical installation is interchangeable.

Q: What certifications apply to each part?

A: The 3AB 750-R carries CE, CSA, and cURus approvals. The 0314.750MXP carries CE, CSA, and UL approvals. Equipment certification requirements should determine which part is appropriate for your application.

Q: Does the DC voltage rating on the 0314.750MXP affect AC-only applications?

A: No. The DC voltage rating is an additional capability that does not impact AC operation. For AC-only circuits, both parts perform identically within their 250 V AC specification.