FN258-42-33 Equivalent & Substitute Parts

Part Overview

The FN258-42-33 is a three-phase (Delta) EMC/EMI line filter rated for 42 A with chassis mount configuration and terminal block termination. This component is designed for inverters and power drive systems operating at DC ~ 60Hz frequencies. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this filter type remains in operational use.

Substiute Parts

FN258-42-33

Schaffner EMC Inc.In Stock: 875FN258-42-33 Datasheet

Current PartRFQ

FN3288-40-33-C35-R65

Schaffner EMC Inc.In Stock: 802FN3288-40-33-C35-R65 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FN258-42-33 is determined by the following critical parameters:

• Filter Type: Three Phase (Delta) configuration
• Configuration: Two Stage EMC/EMI filtering topology
• Mounting Type: Chassis Mount form factor
• Termination Style: Terminal Block connection method
• Voltage Rating: Phase-to-ground and phase-to-phase specifications
• Current Rating: Amperage capacity within acceptable operational range
• Frequency Range: DC ~ 60Hz operating capability
• Compliance: ROHS3 and REACH status alignment

The substitute part FN3288-40-33-C35-R65 meets these core substitution criteria. While the current rating differs (40 A versus 42 A), this represents a conservative downrating that maintains compatibility within the same product family and application domain.

Parameter Comparison

Engineering Selection Recommendations

The FN3288-40-33-C35-R65 is the qualified substitute for the FN258-42-33. Both components are manufactured by Schaffner EMC Inc. and maintain identical filter topology, mounting configuration, and termination methodology. The substitute part carries Active product status, ensuring ongoing availability and support, whereas the original part is designated Not For New Designs.

Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for industrial applications. The substitute part extends the operating temperature range to -40°C ~ 100°C, providing enhanced thermal performance in demanding environments.

The voltage ratings of the substitute part (305 V phase-to-ground, 530 V phase-to-phase) exceed the original specifications (277 V phase-to-ground, 480 V phase-to-phase), ensuring compatibility with systems operating at or below the original voltage levels. The current rating reduction from 42 A to 40 A represents a 4.8% decrease and should be evaluated against actual system load requirements.

Frequently Asked Questions (FAQ)

Q: Can the FN3288-40-33-C35-R65 directly replace the FN258-42-33 in existing installations?

A: Yes, provided that the system current draw does not exceed 40 A. Both parts share identical three-phase (Delta) filter topology, two-stage configuration, chassis mount form factor, and terminal block termination. The substitute part's higher voltage ratings ensure compatibility with systems operating at the original voltage specifications.

Q: What is the significance of the current rating difference between these parts?

A: The FN258-42-33 is rated for 42 A, while the FN3288-40-33-C35-R65 is rated for 40 A. This 2 A difference represents a conservative downrating. System designers must confirm that actual operating current remains at or below 40 A to ensure proper filter performance and thermal management.

Q: Why is the FN258-42-33 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. Schaffner EMC Inc. no longer recommends this component for new product development. The FN3288-40-33-C35-R65, with Active product status, is the current-generation equivalent suitable for both legacy system support and new applications.

Q: Are there packaging or inventory considerations for substitution?

A: Both parts are supplied in Tray packaging. The FN258-42-33 has 832 pieces in stock, while the FN3288-40-33-C35-R65 has 725 pieces available. Procurement timelines and inventory levels should be evaluated based on application requirements.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the FN258-42-33 and FN3288-40-33-C35-R65 are ROHS3 Compliant and REACH Unaffected. Both carry CSA, ENEC, and UR approvals (as specified for the original part), ensuring compliance with industrial safety and environmental standards.