SSQ 200/1K Equivalent & Substitute Parts

Part Overview

The SSQ 200/1K is a 200 mA surface mount board mount fuse rated for 125 V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The fuse features a fast blow response time and is housed in a 2-SMD square end block package suitable for automated assembly processes.

Substiute Parts

SSQ 200/1K

Bel Fuse Inc.In Stock: 1043SSQ 200/1K Datasheet

Current PartRFQ

0451.200MRSN

Littelfuse Inc.In Stock: 10690451.200MRSN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SSQ 200/1K is determined by strict equivalence across the following critical parameters:

• Current Rating: 200 mA (exact match required)
• Voltage Rating: 125 V AC minimum; 125 V DC minimum
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Operating Temperature Range: -55°C to 125°C minimum
• Breaking Capacity: 50 A AC and 300 A DC minimum
• Compliance: ROHS3 Compliant; CSA and/or cULus certification

The substitute part 0451.200MRSN meets all critical electrical and mechanical parameters for direct substitution. Dimensional tolerance in width and height (0.106" vs. 0.100") remains within acceptable PCB footprint compatibility for 2-SMD square end block packages.

Parameter Comparison

Engineering Selection Recommendations

The 0451.200MRSN (Littelfuse Inc. NANO²® 451 series) is the qualified substitute for the obsolete SSQ 200/1K. Selection is based on:

• Electrical equivalence: Identical current rating (200 mA), voltage rating (125 V AC/DC), and response time (Fast Blow)
• Mechanical compatibility: Identical package type (2-SMD, Square End Block) with minimal dimensional variance (±0.006" width and height)
• Thermal compatibility: Matching operating temperature range (-55°C to 125°C)
• Regulatory compliance: ROHS3 compliant; CSA and UR certifications provide continuity of safety approvals
• Product status: Active production status ensures long-term availability and supply chain stability

The 0451.200MRSN is packaged in Tape & Reel format, supporting high-volume automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 0451.200MRSN be used as a direct replacement for the SSQ 200/1K without PCB redesign?

A: Yes. Both components share identical electrical ratings (200 mA, 125 V AC/DC, Fast Blow) and package type (2-SMD, Square End Block). Dimensional differences (±0.006" in width and height) are within standard PCB footprint tolerances for this package class and do not require layout modification.

Q: What is the significance of the dimensional difference between the two parts?

A: The SSQ 200/1K measures 0.100" W x 0.100" H, while the 0451.200MRSN measures 0.106" W x 0.106" H. This 0.006" variance is typical within 2-SMD square end block package specifications and remains compatible with standard PCB pad layouts for this component category.

Q: Are the approval certifications equivalent between the two parts?

A: Both parts carry CSA certification. The SSQ 200/1K includes CE and cULus certifications, while the 0451.200MRSN includes UR certification. CSA approval is common to both, ensuring regulatory continuity for most applications. Design teams should verify specific regional certification requirements for their end application.

Q: Why is the SSQ 200/1K classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Bel Fuse Inc. The 0451.200MRSN, produced by Littelfuse Inc., is an active product with ongoing manufacturing support and supply availability.

Q: What is the difference between the breaking capacity specifications?

A: The SSQ 200/1K specifies 50 A AC and 300 A DC breaking capacity. The 0451.200MRSN specifies 50 A breaking capacity. Both meet minimum breaking capacity requirements for 200 mA fuses at 125 V operation. The SSQ 200/1K's higher DC breaking capacity provides additional margin for DC applications.