Equivalent & Substitute Parts for 3AB 6 Ceramic Fuse

Part Overview

The 3AB 6 is a 6A 250VAC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for fast-blow protection in AC/DC applications. This fuse requires a dedicated holder (3AB or 3AG type) and features a 1/4" x 1-1/4" form factor. The main part number 3AB 6 is currently listed as obsolete, making identification of active equivalent parts essential for procurement and system continuity.

Substiute Parts

3AB 6

Bel Fuse Inc.In Stock: 7873AB 6 Datasheet

Current PartRFQ

3AB 6-R

Bel Fuse Inc.In Stock: 20313AB 6-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3AB 6-R ceramic fuse qualifies as a direct substitute for the 3AB 6 based on the following matching parameters:

• Current Rating: 6 A (identical)
• Voltage Rating (AC): 250 V (identical)
• Fuse Type: Cartridge, Ceramic (identical)
• Response Time: Fast Blow (identical)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (identical)
• Breaking Capacity @ Rated Voltage: 200A (identical)
• Melting I²t: 107 (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)
• DC Cold Resistance: 0.015 Ohms (identical)
• Size / Dimension: 0.250" Dia x 1.252" L (6.35mm x 31.80mm) (identical)

The 3AB 6-R maintains full electrical and mechanical compatibility with the original 3AB 6 specification.

Parameter Comparison

Engineering Selection Recommendations

The 3AB 6-R is the appropriate selection for applications currently using the obsolete 3AB 6. Both parts are manufactured by Bel Fuse Inc. and maintain identical electrical and mechanical specifications. The 3AB 6-R offers the advantage of active product status and ROHS3 compliance, whereas the original 3AB 6 is obsolete and RoHS non-compliant. Both parts carry equivalent regulatory approvals (CE, CSA, PSE) with the 3AB 6-R additionally certified as cULus. Direct substitution is supported without circuit modification or holder replacement.

Frequently Asked Questions (FAQ)

Q: Can the 3AB 6-R be used as a direct replacement for the 3AB 6?

A: Yes. The 3AB 6-R is electrically and mechanically identical to the 3AB 6 across all specified parameters, including current rating, voltage rating, fuse type, response time, package dimensions, and thermal characteristics. No circuit or holder modifications are required.

Q: What is the difference between the 3AB 6 and 3AB 6-R?

A: The primary differences are product status and compliance. The 3AB 6 is obsolete and RoHS non-compliant, while the 3AB 6-R is an active product with ROHS3 compliance. Both maintain identical electrical and mechanical performance.

Q: Are there any compatibility concerns with existing 3AB or 3AG holders?

A: No. Both the 3AB 6 and 3AB 6-R use the same 1/4" x 1-1/4" form factor and are designed for 3AB and 3AG holders. Physical and electrical compatibility is maintained.

Q: What certifications apply to the 3AB 6-R?

A: The 3AB 6-R carries CE, CSA, cULus, and PSE approvals. These certifications align with the original 3AB 6 approvals (CE, CSA, PSE, UL).

Q: Is the 3AB 6-R suitable for both AC and DC applications?

A: Yes. Both the 3AB 6 and 3AB 6-R are rated for 250V AC/DC operation with a 6A current rating and fast-blow response time.