SSQ 10 Surface Mount Fuse – Equivalent & Substitute Parts

Part Overview

The SSQ 10 is a 10 A, 125 V AC / 86 V DC surface mount board fuse manufactured by Bel Fuse Inc. in a 2-SMD, Square End Block package. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing production support, design updates, and inventory management. Substitute parts must maintain electrical compatibility across current rating, voltage specifications, and thermal response characteristics while accommodating modern active product availability.

Substiute Parts

SSQ 10

Bel Fuse Inc.In Stock: 1091SSQ 10 Datasheet

Current PartRFQ

0679L9100-01

Bel Fuse Inc.In Stock: 815530679L9100-01 Datasheet

DirectRFQ

0451010.MRL

Littelfuse Inc.In Stock: 1002220451010.MRL Datasheet

SimilarRFQ

0453010.MR

Littelfuse Inc.In Stock: 224790453010.MR Datasheet

SimilarRFQ

0476010.MR

Littelfuse Inc.In Stock: 32220476010.MR Datasheet

SimilarRFQ

3404.0021.11

SCHURTER Inc.In Stock: 12403404.0021.11 Datasheet

SimilarRFQ

3404.0021.22

SCHURTER Inc.In Stock: 20453404.0021.22 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

• Current Rating: Must be 10 A
• Voltage Rating – AC: Must be 125 V minimum
• Voltage Rating – DC: Must be 86 V minimum
• Response Time: Must be Fast Blow
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must span -55°C to 125°C
• RoHS Compliance: Must be ROHS3 Compliant

All identified substitute parts meet these core requirements. Variations in package dimensions, breaking capacity, melting I²t, and DC cold resistance are noted but do not preclude substitution when electrical parameters align. Package case geometry differences (Square End Block vs. J-Lead) may require PCB layout verification but do not affect electrical function.

Parameter Comparison

Engineering Selection Recommendations

All seven substitute parts satisfy the core electrical and thermal requirements for direct substitution. Selection should prioritize product status and regulatory compliance alignment:

Primary Recommendation – Direct Manufacturer Equivalent: 0679L9100-01 (Bel Fuse Inc.) maintains manufacturer continuity and includes AEC-Q200 automotive qualification, suitable for applications requiring automotive-grade reliability. DC voltage rating is elevated to 125 V, providing enhanced margin over the original 86 V specification.

Alternative Selections – Active Littelfuse NANO²® Series: 0451010.MRL, 0453010.MR, and 0476010.MR are all active Littelfuse products with established supply chains. The NANO²® 451 and 453 series (0451010.MRL, 0453010.MR) offer identical electrical parameters with UL, CSA, and PSE certifications. The NANO²® 476 (0476010.MR) provides the highest breaking capacity (100 A AC, 300 A DC) and lowest melting I²t (14.879), suitable for applications requiring faster response or higher fault current handling.

Alternative Selections – SCHURTER OMF 125 Series: 3404.0021.11 and 3404.0021.22 are functionally equivalent SCHURTER products with identical electrical specifications. Both feature J-Lead package geometry (differing from the original Square End Block) and require PCB layout verification. The OMF 125 series provides 100 A breaking capacity and is available in both Bulk and Tape & Reel packaging options.

Packaging Considerations: Original SSQ 10 is supplied in Cut Tape (CT) & Digi-Reel® format. Substitute availability spans Tape & Reel (TR), Cut Tape (CT), and Bulk packaging. Verify packaging compatibility with assembly processes before final selection.

Frequently Asked Questions (FAQ)

Q: Can SSQ 10 be directly replaced with 0679L9100-01? A: Yes. Both parts share identical current rating (10 A), AC voltage rating (125 V), response time (Fast Blow), mounting type (Surface Mount), and operating temperature range (-55°C to 125°C). The 0679L9100-01 has a higher DC voltage rating (125 V vs. 86 V), which provides additional safety margin and is fully compatible.

Q: What is the difference between the Littelfuse NANO²® 451, 453, and 476 series? A: All three series meet the core electrical requirements. Primary differences are breaking capacity and melting I²t: NANO²® 451 and 453 both provide 35 A AC / 50 A DC breaking capacity with 26.46 melting I²t, while NANO²® 476 provides 100 A AC / 300 A DC breaking capacity with 14.879 melting I²t. Selection depends on fault current requirements in the target application.

Q: Are SCHURTER OMF 125 parts compatible with the original PCB layout? A: Electrical compatibility is confirmed. However, SCHURTER OMF 125 parts use J-Lead package geometry versus the original Square End Block. Physical dimensions differ slightly (0.291" L x 0.122" W x 0.102" H vs. 0.240" L x 0.100" W x 0.100" H). PCB footprint and solder pad layout must be verified before implementation.

Q: Which substitute part has the best supply availability? A: 0451010.MRL (Littelfuse NANO²® 451) has the highest reported inventory at 100,200 pieces. 0679L9100-01 (Bel Fuse Inc.) has 81,508 pieces in stock. Both ensure reliable long-term supply for production requirements.

Q: Do all substitute parts meet RoHS and regulatory compliance requirements? A: All substitute parts are ROHS3 Compliant. Regulatory certifications vary: 0679L9100-01 includes AEC-Q200 and cURus; Littelfuse NANO²® series include UL, CSA, and PSE; SCHURTER OMF 125 includes cURus. Verify specific certifications align with target application and regional requirements.

Q: Can SSQ 10 be used in automotive applications? A: The original SSQ 10 does not carry AEC-Q200 certification. For automotive applications, 0679L9100-01 (AEC-Q200 qualified) is the recommended substitute.