SSQ 4.6 Equivalent & Substitute Parts

Part Overview

The SSQ 4.6 is a 4.6 A surface mount board mount fuse rated for 125 V AC/DC operation with fast blow response characteristics. Manufactured by Bel Fuse Inc., this component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The SSQ 4.6 features a 2-SMD square end block package with 50 A AC and 300 A DC breaking capacity, suitable for circuit protection in industrial and commercial applications.

Substiute Parts

SSQ 3.5

Bel Fuse Inc.In Stock: 1207SSQ 3.5 Datasheet

Current PartRFQ

0679L3500-01

Bel Fuse Inc.In Stock: 34380679L3500-01 Datasheet

DirectRFQ

045103.5MRL

Littelfuse Inc.In Stock: 9642045103.5MRL Datasheet

DirectRFQ

047603.5MR

LittelfuseIn Stock: 1739047603.5MR Datasheet

DirectRFQ

047603.5MRSN

Littelfuse Inc.In Stock: 902047603.5MRSN Datasheet

DirectRFQ

045103.5MRSN

Littelfuse Inc.In Stock: 899045103.5MRSN Datasheet

SimilarRFQ

045303.5MR

Littelfuse Inc.In Stock: 5495045303.5MR Datasheet

SimilarRFQ

3404.0015.11

SCHURTER Inc.In Stock: 16003404.0015.11 Datasheet

SimilarRFQ

3404.0015.22

SCHURTER Inc.In Stock: 25023404.0015.22 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SSQ 4.6 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Direct Substitution:

• Current Rating: 4.6 A (exact match required)
• Voltage Rating AC: 125 V minimum
• Voltage Rating DC: 125 V minimum
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Package / Case: 2-SMD configuration
• Operating Temperature Range: -55°C to 125°C minimum

Direct Substitutes maintain all critical electrical parameters and use square end block or equivalent 2-SMD packaging. These parts are interchangeable in applications designed for the SSQ 4.6.

Similar Substitutes meet the core electrical requirements (4.6 A, 125 V AC/DC, fast blow, surface mount) but may feature different package geometries (J-Lead vs. Square End Block) or higher voltage AC ratings. These require mechanical and footprint verification before implementation.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended for Pin-Compatible Replacement):

0679L3500-01 (Bel Fuse Inc.) is the primary direct substitute. This active part maintains identical electrical ratings (4.6 A, 125 V AC/DC, fast blow) and square end block 2-SMD packaging. It carries AEC-Q200 and cURus certifications, providing automotive-grade reliability. The lower melting I²t value (2.2 vs. 3.9) indicates faster response characteristics within the fast blow category.

045104.6MRL (Littelfuse Inc., NANO²® 451 series) and 045304.6MR (Littelfuse Inc., NANO²® 453 series) are functionally equivalent alternatives with identical electrical specifications and square end block packaging. Both carry CSA, PSE, and UL certifications. These parts are suitable for direct PCB footprint replacement.

Higher Voltage AC Alternatives (Application-Dependent):

047604.6MR and 047604.6MRSN (Littelfuse Inc., NANO²®476 series) provide 250 V AC rating while maintaining 4.6 A current and 125 V DC capability. These parts are appropriate for applications requiring higher AC voltage margin. Both carry cURus certification and feature identical square end block packaging.

Similar Substitutes (Mechanical Verification Required):

3404.0015.11 and 3404.0015.22 (SCHURTER Inc., OMF 125 series) meet all electrical requirements but use J-Lead 2-SMD packaging instead of square end block. These parts require PCB footprint and land pattern verification before implementation. Both carry cURus certification and provide 100 A AC breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can the SSQ 4.6 be replaced with 0679L3500-01?

A: Yes. The 0679L3500-01 is a direct electrical and mechanical equivalent. Both parts are rated 4.6 A at 125 V AC/DC with fast blow response and square end block 2-SMD packaging. The 0679L3500-01 is active and available in production quantities.

Q: What is the difference between square end block and J-Lead packaging?

A: Square end block and J-Lead are different mechanical termination styles. Square end block features flat terminations on the sides, while J-Lead features curved terminations. These require different PCB land patterns and cannot be used interchangeably without footprint redesign.

Q: Can I use 047604.6MR in place of SSQ 4.6?

A: The 047604.6MR is electrically compatible for the 4.6 A and 125 V DC requirements. However, it is rated for 250 V AC instead of 125 V AC. This higher voltage rating does not prevent substitution in 125 V AC applications; it provides additional voltage margin. Mechanical compatibility (square end block packaging) is confirmed.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and are REACH Unaffected, matching the environmental compliance profile of the SSQ 4.6.

Q: What certifications should I verify for my application?

A: Certification requirements depend on application standards. The SSQ 4.6 carries CE, CSA, and cULus approvals. Direct substitutes 0679L3500-01, 045104.6MRL, and 045304.6MR carry CSA, PSE, and UL certifications. Verify that the selected substitute meets your specific regulatory requirements (automotive, industrial, consumer, etc.).

Q: Does melting I²t value affect substitutability?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster response. All listed parts maintain fast blow response characteristics. Differences in I²t values (ranging from 1.6 to 3.9) reflect design variations between manufacturers but do not prevent substitution in applications designed for 4.6 A fast blow protection.