3AB 3-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 3AB 3-R is a 3 A, 250 V AC ceramic cartridge fuse manufactured by Bel Fuse Inc. This fast-blow fuse is designed for applications requiring holder-based mounting in 3AB, 3AG, or 1/4" x 1-1/4" form factors. The part maintains active product status with 1135 units in current inventory. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the specified parameter envelope.

Substiute Parts

3AB 3-R

Bel Fuse Inc.In Stock: 11493AB 3-R Datasheet

Current PartRFQ

0314003.MXP

LittelfuseIn Stock: 16620314003.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AB 3-R is determined by the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

The substitute part 0314003.MXP (Littelfuse) meets all critical parameters for direct substitution. Additional voltage rating capability (125 V DC) and enhanced breaking capacity on DC (10 kA) represent extended functionality that does not compromise AC circuit protection performance.

Parameter Comparison

Engineering Selection Recommendations

Both the 3AB 3-R and 0314003.MXP maintain active product status and comply with ROHS3 and REACH requirements. The 0314003.MXP carries broader regulatory approvals (CE, CSA, K-MARK, PSE, UL) compared to the 3AB 3-R (CE, CSA, cURus, PSE), providing expanded certification coverage for international applications. Selection between these parts should be based on specific regulatory requirements of the target application and supplier availability.

Frequently Asked Questions (FAQ)

Q: Can 0314003.MXP be used as a direct replacement for 3AB 3-R in existing circuits?

A: Yes. Both parts share identical current rating (3 A), AC voltage rating (250 V), fuse type (ceramic cartridge), response time (fast blow), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), and operating temperature range (-55°C ~ 125°C). Physical and electrical compatibility is confirmed.

Q: What is the significance of the DC voltage rating on 0314003.MXP?

A: The 0314003.MXP includes a 125 V DC rating, whereas the 3AB 3-R specifies only AC voltage. This extended rating does not affect AC circuit performance and provides additional functionality for applications requiring DC protection.

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

A: Yes. The 3AB 3-R has a melting I²t of 21, while 0314003.MXP has 14.6. This difference reflects variations in ceramic composition and thermal characteristics. Both values fall within the fast-blow response category and are suitable for their respective applications.

Q: Do dimensional differences exist between these fuses?

A: Minor dimensional variation exists. The 3AB 3-R measures 0.250" Dia x 1.252" L (6.35mm x 31.80mm), while 0314003.MXP measures 0.250" Dia x 1.250" L (6.35mm x 31.75mm). Both fit standard 3AB and 3AG holders without mechanical interference.

Q: Which certifications should I prioritize for my application?

A: Certification selection depends on target markets and regulatory requirements. The 3AB 3-R holds CE, CSA, cURus, and PSE approvals. The 0314003.MXP holds CE, CSA, K-MARK, PSE, and UL approvals. Verify that the selected part's certification portfolio aligns with your application's geographic and industry standards.