3AB 4.6 Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 3AB 4.6 is a ceramic cartridge fuse manufactured by Bel Fuse Inc., rated for 4.6 A at 250 V AC/DC with fast-blow response characteristics. This component is classified as obsolete, which necessitates identification of active equivalent parts for continued system support and procurement. The 3AB 4.6-R serves as the direct active substitute, maintaining identical electrical and mechanical specifications while offering improved compliance status.

Substiute Parts

3AB 3.5

Bel Fuse Inc.In Stock: 11783AB 3.5 Datasheet

Current PartRFQ

3AB 3.5-R

Bel Fuse Inc.In Stock: 11243AB 3.5-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3AB 4.6-R qualifies as a direct substitute for the 3AB 4.6 based on strict equivalence across all critical electrical and mechanical parameters. Substitution criteria are determined by the following parameters:

• Current Rating: 4.6 A (identical)
• Voltage Rating: 250 V AC (identical)
• Fuse Type: Cartridge, Ceramic (identical)
• Response Time: Fast Blow (identical)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (identical)
• Breaking Capacity: 100 A (identical)
• Melting I²t: 28 (identical)
• DC Cold Resistance: 0.03 Ohms (identical)
• Operating Temperature Range: -55°C ~ 125°C (identical)

The substitute maintains full compatibility with existing holder assemblies and circuit protection requirements.

Parameter Comparison

Engineering Selection Recommendations

The 3AB 4.6-R is the appropriate selection for applications currently using the 3AB 4.6. The substitute part maintains complete electrical and mechanical compatibility while offering active product status and improved regulatory compliance. The 3AB 4.6-R carries ROHS3 compliance, addressing modern environmental standards, whereas the original 3AB 4.6 is non-compliant. Both parts hold equivalent approval certifications from CE, CSA, and PSE authorities. The transition from obsolete to active status ensures long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 3AB 4.6-R be used as a direct replacement for the 3AB 4.6?

A: Yes. The 3AB 4.6-R is electrically and mechanically identical to the 3AB 4.6 across all specified parameters, including current rating, voltage rating, response time, package dimensions, and breaking capacity. No circuit modifications are required.

Q: Are there any differences in holder compatibility?

A: No. Both the 3AB 4.6 and 3AB 4.6-R require the same holder assembly (3AB, 3AG) and share identical physical dimensions of 1/4" x 1-1/4" (6.35mm x 31.80mm).

Q: What is the significance of the RoHS compliance difference?

A: The 3AB 4.6-R is ROHS3 compliant, meeting current environmental regulations for restricted substances. The original 3AB 4.6 is non-compliant. For new designs or systems subject to RoHS requirements, the 3AB 4.6-R is the appropriate choice.

Q: Do both parts have the same approval certifications?

A: Both parts carry CE, CSA, and PSE certifications. The 3AB 4.6 includes UL approval, while the 3AB 4.6-R includes cURus approval. Both meet recognized safety standards for circuit protection applications.

Q: What is the melting I²t value, and why is it important?

A: The melting I²t value of 28 indicates the thermal energy required to melt the fuse element. This parameter is identical for both parts and determines the fuse's response to overcurrent conditions. Matching this value ensures equivalent protection characteristics.

Q: Can the 3AB 4.6-R be used in AC and DC applications?

A: Yes. Both the 3AB 4.6 and 3AB 4.6-R are rated for 250 V AC/DC operation with a fast-blow response time suitable for general-purpose circuit protection.