FN258-75-34 Equivalent & Substitute Parts

Part Overview

The FN258-75-34 is a three-phase (Delta) EMC/EMI line filter rated for 75 A, designed for chassis mount applications with terminal block termination. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. For new applications or replacement inventory, equivalent substitute parts with compatible electrical and mechanical specifications are necessary.

Substiute Parts

FN258-75-34

Schaffner EMC Inc.In Stock: 918FN258-75-34 Datasheet

Current PartRFQ

FN3288-80-34-C35-R65

Schaffner EMC Inc.In Stock: 1070FN3288-80-34-C35-R65 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN258-75-34 is determined by the following critical parameters:

• Filter Type: Three Phase (Delta) configuration
• Configuration: Two Stage topology
• Current Rating: 75 A or higher
• Voltage Ratings: Phase to Ground/Neutral minimum 277 V; Phase to Phase minimum 480 V
• Mounting Type: Chassis Mount
• Termination Style: Terminal Block
• Operating Frequency: DC ~ 60Hz capability
• Operating Temperature Range: Minimum -25°C ~ 100°C
• Compliance: RoHS3 and regulatory approvals (CSA, ENEC, UR)

The FN3288-80-34-C35-R65 qualifies as a substitute because it maintains the same filter type, configuration, mounting method, and termination style while exceeding the current rating (80 A vs. 75 A) and voltage specifications. The substitute part is classified as Active, providing continued availability for new designs.

Parameter Comparison

Engineering Selection Recommendations

The FN3288-80-34-C35-R65 is the appropriate substitute for the FN258-75-34 in new designs and replacement applications. The substitute part exceeds the original specifications in current capacity (80 A vs. 75 A) and voltage ratings (305 V / 530 V vs. 277 V / 480 V), ensuring compatibility with existing circuit requirements while providing enhanced performance margins. The Active product status of the FN3288-80-34-C35-R65 ensures continued availability and supply chain reliability. Both parts maintain identical filter topology, mounting configuration, and termination methods, enabling direct mechanical and electrical integration. Compliance certifications (RoHS3, CSA, ENEC, UR) are maintained across both parts. The extended operating temperature range of the substitute part (-40°C vs. -25°C minimum) provides additional environmental flexibility.

Frequently Asked Questions (FAQ)

Q: Can the FN3288-80-34-C35-R65 directly replace the FN258-75-34 in existing installations?

A: Yes. Both parts share identical filter type (Three Phase Delta), configuration (Two Stage), mounting type (Chassis Mount), and termination style (Terminal Block). The substitute part's higher current and voltage ratings ensure compatibility with circuits designed for the original part.

Q: What is the significance of the current rating difference (75 A vs. 80 A)?

A: The substitute part's 80 A rating exceeds the original 75 A specification, providing additional current capacity. This allows the substitute to handle the same load as the original part with improved thermal margin and reliability.

Q: Are the voltage specifications compatible between these parts?

A: The FN3288-80-34-C35-R65 is rated for 305 V phase-to-ground and 530 V phase-to-phase, both exceeding the FN258-75-34 ratings of 277 V and 480 V respectively. This ensures the substitute part operates safely in circuits designed for the original part.

Q: Why is the FN258-75-34 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. The FN3288-80-34-C35-R65, classified as Active, is the recommended choice for new product development and long-term supply assurance.

Q: Are packaging and compliance specifications identical?

A: Both parts are supplied in Tray packaging and maintain RoHS3 compliance. Regulatory approvals (CSA, ENEC, UR) are consistent across both parts, ensuring compliance with applicable standards.

Q: Does the operating temperature range affect substitution suitability?

A: The substitute part's extended minimum operating temperature (-40°C vs. -25°C) provides broader environmental compatibility. This does not restrict substitution but rather expands the operational envelope for the substitute part.