Equivalent & Substitute Parts for 3AB 2-R Ceramic Fuse

Part Overview

The 3AB 2-R is a 2 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. This fast-blow fuse is designed for applications requiring reliable overcurrent protection in AC circuits. The part is currently active in production with 1526 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the 3AB, 3AG form factor.

Substiute Parts

3AB 2-R

Bel Fuse Inc.In Stock: 16223AB 2-R Datasheet

Current PartRFQ

0314002.MXP

Littelfuse Inc.In Stock: 16300314002.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3AB 2-R is determined by the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required for mechanical fit)
• Response Time: Fast Blow (exact match required for circuit protection characteristics)

The substitute part 0314002.MXP from Littelfuse Inc. meets all these critical parameters. This part additionally provides DC voltage rating capability (125 V DC), which extends application flexibility without compromising AC circuit protection performance.

Parameter Comparison

Engineering Selection Recommendations

Both the 3AB 2-R and 0314002.MXP are active products with full regulatory compliance. The 3AB 2-R carries CE, CSA, cURus, and PSE certifications. The 0314002.MXP carries CE, CSA, PSE, and UL certifications, providing additional UL approval for North American applications.

Selection between these parts should be based on application requirements and supply chain considerations. The 0314002.MXP provides extended DC voltage capability (125 V DC) and higher breaking capacity for DC circuits (10 kA DC), making it suitable for dual-voltage applications. The 3AB 2-R remains the specified part for AC-only circuits where DC rating is not required.

Both parts maintain identical current rating, AC voltage rating, response time, and mechanical form factor, ensuring direct functional equivalence in AC circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can 0314002.MXP be used as a direct replacement for 3AB 2-R?

A: Yes. Both parts share identical current rating (2 A), AC voltage rating (250 V), ceramic cartridge construction, fast-blow response, and 3AB/3AG package dimensions. Mechanical and electrical compatibility is confirmed for AC circuit applications.

Q: What is the significance of the DC voltage rating on 0314002.MXP?

A: The 0314002.MXP includes a 125 V DC rating, which the 3AB 2-R does not specify. This allows the Littelfuse part to be used in mixed AC/DC applications or circuits where DC transient protection is required. For AC-only applications, this parameter does not affect performance.

Q: Are there differences in melting I²t values between these parts?

A: Yes. The 3AB 2-R has a melting I²t of 7.2, while the 0314002.MXP has 11. This indicates the Littelfuse part requires slightly higher thermal energy to melt. Both parts maintain the same 2 A current rating and fast-blow response time, so this difference does not affect standard overcurrent protection in AC circuits.

Q: Do both parts require the same holder?

A: Yes. Both parts use the 3AB, 3AG holder format with 1/4" diameter and 1-1/4" length. They are mechanically interchangeable in existing fuse holders.

Q: Which certifications should I consider for my application?

A: The 3AB 2-R holds CE, CSA, cURus, and PSE certifications. The 0314002.MXP holds CE, CSA, PSE, and UL certifications. Select the part whose certification set matches your regional and application requirements.