SSQ 15 Equivalent & Substitute Parts

Part Overview

The SSQ 15 is a 15A surface mount board mount fuse manufactured by Bel Fuse Inc., rated for 86V DC operation with fast blow response characteristics. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SSQ 15 features a 2-SMD square end block package with CE and cURus certifications, operating across -55°C to 125°C temperature range.

Key Parameters

Parameter	SSQ 15 Specification
Current Rating	15 A
Voltage Rating - DC	86 V
Response Time	Fast Blow
Mounting Type	Surface Mount
Package / Case	2-SMD, Square End Block
Breaking Capacity @ Rated Voltage	10 kA
Operating Temperature	-55°C ~ 125°C
DC Cold Resistance	0.004 Ohms
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SSQ 15 are grouped based on voltage rating compatibility and electrical performance characteristics. The primary substitution criterion is the ability to operate at or above the original 86V DC rating while maintaining the 15A current specification and fast blow response time. All substitute candidates maintain identical mounting type (surface mount), package configuration (2-SMD square end block), and operating temperature range (-55°C to 125°C).

Substitutes are categorized into two groups:

Direct Voltage Equivalents (125V AC/DC rated): Parts rated for 125V AC/125V DC operation provide voltage margin above the original 86V DC specification, ensuring compatibility in applications where the SSQ 15 was deployed.

Lower Voltage Alternatives (65V AC/DC rated): Parts rated for 65V AC/65V DC operation are suitable only for applications where the circuit voltage does not exceed 65V DC, representing a voltage derating from the original specification.

Parameter Comparison

Parameter	SSQ 15	0679L9150-01	0451015.MRL	0453015.MR	0476015.MR
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (A)	15	15	15	15	15
Voltage Rating - DC (V)	86	125	65	65	125
Voltage Rating - AC (V)	—	125	65	65	125
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block
Breaking Capacity @ Rated Voltage	10 kA	50 A AC, 300 A DC	50 A	50 A	100 A AC, 300 A DC
Melting I²t	121	104.6	97.82	97.82	61.286
DC Cold Resistance (Ohms)	0.004	0.0038	0.0037	0.0037	0.0045
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

0679L9150-01 (Bel Fuse Inc.): This direct manufacturer equivalent provides 125V AC/125V DC rating, exceeding the original 86V DC specification. Active product status ensures long-term availability and supply chain continuity. Certifications include AEC-Q200 and cURus, supporting automotive and industrial applications. Melting I²t of 104.6 is comparable to the original specification, maintaining similar thermal response characteristics.

0476015.MR (Littelfuse Inc., NANO²® 476): This substitute offers 125V AC/125V DC rating with active product status and cURus certification. Breaking capacity of 100A AC and 300A DC exceeds the original 10kA specification. Melting I²t of 61.286 indicates faster thermal response compared to the SSQ 15. Tape & Reel packaging differs from the original Cut Tape & Digi-Reel® format.

0451015.MRL (Littelfuse Inc., NANO²® 451): This substitute is rated for 65V AC/65V DC operation, representing a voltage derating from the original 86V DC specification. Active product status and CSA/UL certifications support North American applications. Melting I²t of 97.82 provides thermal response comparable to the original part.

0453015.MR (Littelfuse Inc., NANO²® 453): This substitute is rated for 65V AC/65V DC operation, representing a voltage derating from the original 86V DC specification. Active product status and CSA/UL certifications support North American applications. Melting I²t of 97.82 provides thermal response comparable to the original part.

Frequently Asked Questions (FAQ)

Q: Can the 0679L9150-01 be used as a direct replacement for the SSQ 15?

A: Yes. The 0679L9150-01 maintains the same 15A current rating, 2-SMD square end block package, fast blow response, and operating temperature range. The 125V DC rating exceeds the original 86V DC specification, providing voltage margin. Both parts are manufactured by Bel Fuse Inc. and hold ROHS3 compliance.

Q: What is the voltage limitation when using 0451015.MRL or 0453015.MR?

A: Both parts are rated for 65V AC/65V DC operation. These substitutes are suitable only for applications where circuit voltage does not exceed 65V DC. The original SSQ 15 is rated for 86V DC, so these parts represent a voltage derating and are not suitable for all original applications.

Q: How do the melting I²t values affect substitution?

A: Melting I²t determines the thermal energy required to melt the fuse element. The SSQ 15 has a melting I²t of 121. The 0679L9150-01 (104.6) and lower-voltage alternatives (97.82) have lower values, indicating faster thermal response. The 0476015.MR (61.286) has significantly lower melting I²t, indicating substantially faster response. Application-specific thermal requirements must be evaluated.

Q: Are there packaging differences between substitutes?

A: The SSQ 15 is supplied in Cut Tape (CT) & Digi-Reel® packaging. The 0679L9150-01, 0451015.MRL, and 0453015.MR maintain this packaging format. The 0476015.MR is supplied in Tape & Reel (TR) format, which may require different handling and assembly processes.

Q: Which substitute has the best long-term availability?

A: All substitute parts carry active product status. The 0679L9150-01 offers the highest inventory level (133,565 pcs) and direct manufacturer equivalence from Bel Fuse Inc., supporting long-term design continuity.

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