SPJ-4E200 Equivalent & Substitute Parts Reference

Part Overview

The SPJ-4E200 is a 200A, 1kV radial bend through-hole fuse manufactured by Eaton - Bussmann Electrical Division, part of the Semitron™ SPJ series. This component is classified as obsolete, indicating discontinuation from active production. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for system maintenance, repair, and component sourcing in applications requiring 200A fuse protection at 1kV operating conditions.

Substiute Parts

SPJ-4E200

Eaton - Bussmann Electrical DivisionIn Stock: 736SPJ-4E200 Datasheet

Current PartRFQ

170M3744

Eaton - Bussmann Electrical DivisionIn Stock: 929170M3744 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPJ-4E200 is determined by the following critical electrical and mechanical parameters:

Current Rating: 200A — The substitute must provide identical current protection capacity.

Voltage Rating: 1kV minimum — The substitute must support at least 1kV operating voltage to maintain system safety margins.

Manufacturer: Eaton - Bussmann Electrical Division — Substitutes are sourced from the same manufacturer to ensure design compatibility and quality standards.

Product Status: Active production status is required for the substitute to ensure ongoing availability and supply chain reliability.

The identified substitute part 170M3744 meets these core electrical requirements. However, it differs in mounting type (bolt mount versus through-hole) and physical form factor (rectangular blade versus radial bend cylinder), reflecting a functional substitution rather than a direct mechanical replacement.

Parameter Comparison

Engineering Selection Recommendations

The 170M3744 is an active production substitute for the obsolete SPJ-4E200, meeting the core electrical requirements of 200A current protection and exceeding the voltage rating (1.3kVAC versus 1kV). Both components are manufactured by Eaton - Bussmann Electrical Division and share identical ECCN classification (EAR99), ensuring regulatory consistency.

Selection of the 170M3744 requires verification that the application circuit supports bolt mount installation in place of through-hole mounting. The rectangular blade form factor and larger physical dimensions (2.913" L x 1.772" W x 2.323" H) necessitate mechanical redesign of the mounting interface. The substitute's higher voltage rating provides additional safety margin in applications operating at or near 1kV.

Frequently Asked Questions (FAQ)

Q: Can the 170M3744 directly replace the SPJ-4E200 without circuit modification?

A: No. The SPJ-4E200 uses through-hole mounting with a radial bend cylinder form factor, while the 170M3744 requires bolt mount installation with a rectangular blade configuration. Circuit board or mounting hardware redesign is necessary.

Q: Are the electrical protection characteristics identical between these parts?

A: Both components provide 200A current protection. The 170M3744 operates at 1.3kVAC, exceeding the SPJ-4E200's 1kV rating, providing additional voltage margin. Melting I²t value for the 170M3744 is specified as 5150, indicating response time characteristics suitable for industrial electrical applications.

Q: What compliance certifications apply to the 170M3744?

A: The 170M3744 holds CSA and UR approvals with a breaking capacity of 100kA at rated voltage. It is RoHS Compliant. Both parts share EAR99 ECCN classification.

Q: Why is the SPJ-4E200 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. The 170M3744, as an active production part from the same manufacturer, represents the current equivalent offering for 200A fuse protection in industrial electrical applications.

Q: What is the inventory status for these parts?

A: The SPJ-4E200 has 702 pieces available as new original stock. The 170M3744 has 822 pieces available as new original stock in bulk packaging.