SPP-4F50 Equivalent & Substitute Parts

Part Overview

The SPP-4F50 is a fuse link manufactured by Eaton - Bussmann Electrical Division, rated for 50A at 700V with blade mounting. This component is classified as obsolete, requiring identification of functionally equivalent alternatives for continued system support and procurement planning. The obsolete status necessitates substitute part evaluation to maintain electrical system integrity and operational continuity.

Substiute Parts

SPP-4F50

Eaton - Bussmann Electrical DivisionIn Stock: 913SPP-4F50 Datasheet

Current PartRFQ

170M3709

Eaton - Bussmann Electrical DivisionIn Stock: 779170M3709 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 170M3709 qualifies as a functional substitute based on the following critical parameters:

• Current Rating Match: Both parts are rated for 50A continuous current capacity
• Voltage Rating Match: Both parts are rated for 700V AC operation
• Manufacturer Consistency: Both are manufactured by Eaton - Bussmann Electrical Division, ensuring design compatibility and quality standards
• Regulatory Compliance: Both parts carry ECCN EAR99 classification and HTSUS 8536.10.0040 coding
• Mounting Compatibility: The 170M3709 bolt mount configuration provides equivalent electrical connection capability within the same product family

The primary difference is the physical form factor: SPP-4F50 uses blade mounting requiring a holder, while 170M3709 uses bolt mount with rectangular configuration. Both configurations deliver identical electrical performance at the specified ratings.

Parameter Comparison

Engineering Selection Recommendations

The 170M3709 is the designated substitute for SPP-4F50 based on electrical parameter equivalence and active product status. Selection of 170M3709 provides:

• Continued availability from the same manufacturer, ensuring consistent quality and design philosophy
• Active product status with established supply chain support
• Identical electrical performance at 50A, 700V ratings
• RoHS compliance status, meeting current environmental standards
• Documented breaking capacity of 200kA and melting I²t of 77, providing quantified performance data

Mechanical integration requires evaluation of the mounting interface transition from blade-type holder mounting to bolt mount configuration. This substitution is electrically valid and maintains system protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can 170M3709 directly replace SPP-4F50 in existing installations?

A: Electrical substitution is valid based on identical current and voltage ratings. Physical mounting interface compatibility must be verified, as SPP-4F50 uses blade mounting requiring a holder, while 170M3709 uses bolt mount configuration.

Q: What are the critical parameters for fuse substitution in this category?

A: Current rating (50A), voltage rating (700V), and manufacturer consistency are the primary substitution criteria. Both parts meet these requirements.

Q: Why is SPP-4F50 listed as obsolete?

A: Obsolete status indicates the part is no longer in active production. The 170M3709 substitute provides equivalent electrical function with active availability.

Q: Are there compliance differences between these parts?

A: Both parts carry identical ECCN and HTSUS classifications. The 170M3709 includes documented RoHS compliance status, while SPP-4F50 compliance status is not specified.

Q: What is the significance of the 200kA breaking capacity specification?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt. The 170M3709 specification of 200kA at rated voltage provides quantified performance data for system design verification.