SSQ 5 Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. SSQ 5 is a 5A 125VAC/125VDC surface mount board fuse with fast-blow response characteristics, designed for circuit protection in compact 2-SMD square end block packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain identical electrical ratings and mechanical compatibility while offering active product status and improved availability.

Substiute Parts

SSQ 5

Bel Fuse Inc.In Stock: 1131SSQ 5 Datasheet

Current PartRFQ

0679L5000-01

Bel Fuse Inc.In Stock: 85240679L5000-01 Datasheet

DirectRFQ

0451005.MRL

Littelfuse Inc.In Stock: 1051320451005.MRL Datasheet

DirectRFQ

0476005.MR

Littelfuse Inc.In Stock: 25280476005.MR Datasheet

DirectRFQ

0476005.MRSN

Littelfuse Inc.In Stock: 10320476005.MRSN Datasheet

DirectRFQ

0451005.MRSN

Littelfuse Inc.In Stock: 29350451005.MRSN Datasheet

SimilarRFQ

0453005.MR

Littelfuse Inc.In Stock: 260950453005.MR Datasheet

SimilarRFQ

3404.0017.11

SCHURTER Inc.In Stock: 31983404.0017.11 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSQ 5 are classified into two categories based on electrical parameter compatibility:

Direct Electrical Equivalents (125VAC/125VDC): Parts maintaining identical voltage ratings (125V AC and 125V DC) with 5A current rating and fast-blow response. These parts are fully interchangeable from an electrical standpoint and include:

• 0679L5000-01 (Bel Fuse Inc.)
• 0451005.MRL (Littelfuse Inc.)
• 0451005.MRSN (Littelfuse Inc.)
• 0453005.MR (Littelfuse Inc.)
• 3404.0017.11 (SCHURTER Inc.)

Elevated AC Voltage Variant (250VAC/125VDC): Parts with increased AC voltage rating (250V AC) while maintaining 125V DC and 5A current rating. These provide enhanced AC voltage protection and include:

• 0476005.MR (Littelfuse Inc.)
• 0476005.MRSN (Littelfuse Inc.)

Substitution eligibility is determined by matching current rating (5A), response time (fast blow), mounting type (surface mount), and package configuration (2-SMD square end block). Voltage ratings must equal or exceed the original specification.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (125VAC/125VDC Requirement):

The 0451005.MRL and 0453005.MR from Littelfuse Inc. are preferred direct substitutes. Both maintain identical electrical specifications (5A, 125VAC/125VDC, fast-blow) with active product status and comprehensive certification coverage (CSA, PSE, UL). The 0451005.MRL is available in Cut Tape & Digi-Reel packaging, while 0453005.MR is supplied on Tape & Reel. Both are ROHS3 compliant with unlimited moisture sensitivity rating.

The 0679L5000-01 from Bel Fuse Inc. provides continuity within the same manufacturer family and includes AEC-Q200 automotive qualification. This part is suitable for applications requiring automotive-grade reliability.

The 0451005.MRSN offers identical electrical and mechanical specifications to 0451005.MRL with alternative certification (METI, UR) and Tape & Reel packaging.

For Elevated AC Voltage Applications (250VAC/125VDC):

The 0476005.MR and 0476005.MRSN provide enhanced AC voltage protection at 250V while maintaining 125V DC rating and 5A current. These parts are suitable for circuits requiring higher AC voltage withstand capability. Both variants are active products with cURus certification and identical mechanical dimensions.

Mechanical Compatibility Note:

The 3404.0017.11 from SCHURTER Inc. maintains electrical equivalence but features J-Lead package configuration and larger physical dimensions (7.40 x 3.10 x 2.60 mm) compared to the square end block standard. PCB layout verification is required before selection.

Frequently Asked Questions (FAQ)

Q: Can 0451005.MRL be used as a direct replacement for SSQ 5?

A: Yes. The 0451005.MRL maintains identical electrical ratings (5A, 125VAC/125VDC, fast-blow response) and surface mount 2-SMD square end block packaging. Physical dimensions vary slightly (2.69 mm height vs. 2.54 mm), requiring PCB clearance verification. Active product status and comprehensive certifications make this a suitable direct substitute.

Q: What is the difference between 0451005.MRL and 0451005.MRSN?

A: Both parts are electrically and mechanically identical with matching 5A, 125VAC/125VDC ratings and 2-SMD square end block packaging. The primary difference is certification coverage: 0451005.MRL includes CSA, PSE, and UL approvals, while 0451005.MRSN includes CSA, METI, and UR approvals. Selection depends on regional regulatory requirements.

Q: When should 0476005.MR be selected instead of direct 125V equivalents?

A: The 0476005.MR is specified when circuit design requires 250V AC voltage withstand capability while maintaining 125V DC and 5A current rating. This elevated AC rating provides additional protection margin in high-voltage AC applications. Electrical and mechanical compatibility with 125VAC designs is maintained.

Q: Is the 3404.0017.11 from SCHURTER compatible with existing PCB layouts?

A: The 3404.0017.11 maintains electrical equivalence but differs in package configuration (J-Lead vs. square end block) and physical dimensions (7.40 x 3.10 x 2.60 mm vs. 6.10 x 2.54 x 2.54 mm). PCB footprint and clearance verification is required before implementation.

Q: What packaging options are available for substitute parts?

A: Substitute parts are supplied in multiple packaging formats: Cut Tape & Digi-Reel (0451005.MRL), Tape & Reel (0679L5000-01, 0451005.MRSN, 0453005.MR, 0476005.MR, 0476005.MRSN), and Bulk (3404.0017.11). Selection depends on production volume and assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1), matching the original SSQ 5 environmental specifications.