Equivalent & Substitute Parts for 3AB 15-R Ceramic Fuse

Part Overview

The 3AB 15-R is a ceramic cartridge fuse manufactured by Bel Fuse Inc., rated for 15 A at 250 V AC with fast-blow response characteristics. This component is designed for applications requiring overcurrent protection in AC circuits and is actively supported by the manufacturer. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the 3AB, 3AG form factor.

Substiute Parts

3AB 15-R

Bel Fuse Inc.In Stock: 19113AB 15-R Datasheet

Current PartRFQ

0314015.MXP

Littelfuse Inc.In Stock: 28780314015.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3AB 15-R with the 0314015.MXP (Littelfuse Inc.) is based on the following alignment of critical parameters:

• Current Rating: Both parts rated at 15 A
• Voltage Rating (AC): Both parts rated at 250 V AC
• Fuse Type: Both are ceramic cartridge fuses
• Response Time: Both exhibit fast-blow characteristics
• Package / Case: Both use 3AB, 3AG form factor with 1/4" x 1-1/4" dimensions
• Breaking Capacity: Both rated at 750 A at rated voltage
• Operating Temperature: Both operate across -55°C ~ 125°C range
• Mounting: Both require a compatible holder

The 0314015.MXP provides additional DC voltage rating (125 V DC) and higher DC breaking capacity (10 kA DC), which does not restrict its use in AC-only applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 3AB 15-R and 0314015.MXP are active products with full regulatory compliance. Selection between these parts should be based on:

• Availability and lead time requirements
• Specific approval agency requirements for the end application (both parts carry CE and CSA certifications; the 0314015.MXP additionally carries K-MARK and UL approvals)
• DC voltage requirements, if applicable (the 0314015.MXP supports 125 V DC operation)
• Melting I²t characteristics, which differ between the two parts (845 vs. 292)

Both parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0314015.MXP be used as a direct replacement for the 3AB 15-R?

A: Yes, for AC applications at 250 V and 15 A. Both parts share identical current rating, AC voltage rating, fuse type, response time, and package form factor. Physical dimensions are within tolerance (1.252" vs. 1.250" length).

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

A: The melting I²t (845 vs. 292) indicates the thermal energy required to melt the fuse element. This parameter affects the fuse's response to transient overcurrent conditions. Selection should align with the specific circuit protection requirements.

Q: Does the 0314015.MXP's DC voltage rating affect AC-only applications?

A: No. The additional DC voltage rating does not restrict use in AC circuits. The 0314015.MXP remains fully compatible with 250 V AC applications.

Q: Are both parts compatible with the same holder?

A: Yes. Both parts use the 3AB, 3AG form factor and require a compatible 3AB or 3AG holder. Physical dimensions are equivalent within standard tolerances.

Q: Which certifications should I prioritize for my application?

A: Both parts carry CE and CSA certifications. If your application requires UL or K-MARK approval, the 0314015.MXP is the appropriate choice.