SPJ-4B175 Equivalent & Substitute Parts

Part Overview

The SPJ-4B175 is a 175A radial bend through-hole fuse manufactured by Eaton - Bussmann Electrical Division, part of the Semitron™ SPJ series. This component is classified as obsolete, indicating that direct replacement from the original manufacturer is no longer available. Finding equivalent or substitute parts is necessary to maintain system functionality and ensure continued availability for repair, maintenance, or new designs that require compatible fuse protection.

Substiute Parts

SPJ-4B175

Eaton - Bussmann Electrical DivisionIn Stock: 1021SPJ-4B175 Datasheet

Current PartRFQ

170M3694

Eaton - Bussmann Electrical DivisionIn Stock: 938170M3694 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPJ-4B175 is constrained by the following critical parameters:

• Current Rating: 175A nominal protection level
• Voltage Rating: 1 kV system voltage compatibility
• Mounting Type: Through Hole configuration for PCB or panel integration
• Package / Case: Radial Bend Cylinder form factor for mechanical fit

The substitute part 170M3694 differs significantly in mounting type (Bolt Mount vs. Through Hole), package geometry (Rectangular Blade vs. Radial Bend Cylinder), current rating (200A vs. 175A), and voltage rating (1.3 kVAC vs. 1 kV). These differences indicate that 170M3694 is not a direct functional equivalent for applications requiring the specific through-hole radial bend configuration of the SPJ-4B175.

Parameter Comparison

Engineering Selection Recommendations

The SPJ-4B175 is an obsolete component from an active manufacturer (Eaton - Bussmann Electrical Division). When seeking alternatives:

• Direct Replacement: Contact Eaton - Bussmann Electrical Division to determine if an active-status through-hole radial bend fuse exists within the current product portfolio that maintains the 175A / 1 kV specifications.

• Design Modification: If direct replacement is unavailable, evaluate whether the application can accommodate a different mounting type (such as bolt mount) and package geometry. The 170M3694 provides higher current (200A) and voltage (1.3 kVAC) ratings, but requires mechanical redesign due to its bolt mount configuration and significantly larger dimensions.

• Compliance: Both parts carry REACH Unaffected or equivalent status and EAR99 ECCN classification, supporting regulatory compliance in most jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can the 170M3694 directly replace the SPJ-4B175?

A: No. The 170M3694 uses bolt mount configuration and rectangular blade package geometry, whereas the SPJ-4B175 requires through-hole radial bend mounting. Mechanical redesign of the circuit board or panel would be necessary. Additionally, the current and voltage ratings differ (200A / 1.3 kVAC vs. 175A / 1 kV).

Q: What makes a fuse a valid substitute for the SPJ-4B175?

A: A valid substitute must maintain the same current rating (175A), voltage rating (1 kV), and mounting type (through-hole radial bend cylinder). Package dimensions must be compatible with existing mechanical constraints.

Q: Is the SPJ-4B175 still available?

A: The SPJ-4B175 is classified as obsolete. Inventory may exist through authorized distributors, but new production is not available from the manufacturer. Eaton - Bussmann Electrical Division should be contacted for end-of-life support options.

Q: What are the regulatory compliance considerations?

A: Both the SPJ-4B175 and 170M3694 are REACH Unaffected and classified as EAR99 under ECCN, supporting use in most commercial and industrial applications without additional export or import restrictions.

Q: Can I use a higher-rated fuse as a substitute?

A: No. Using a fuse with a higher current rating (such as 200A instead of 175A) will not provide the intended circuit protection at 175A and may result in inadequate protection or system damage. Current rating must match the design specification.