FN256-120-35 Equivalent & Substitute Parts

Part Overview

The FN256-120-35 is a three-phase (Wye) EMC/EMI line filter rated for 120 A with chassis mount configuration and terminal block termination. This component is classified as obsolete, making identification of suitable substitute parts essential for system design and maintenance applications. The filter operates across DC to 60 Hz frequency range and is approved by CSA, ENEC, and UR agencies. Due to its obsolete status, the active FN3256H-120-35 serves as the primary substitute option for new designs and replacement scenarios.

Substiute Parts

FN256-120-35

Schaffner EMC Inc.In Stock: 942FN256-120-35 Datasheet

Current PartRFQ

FN3256H-120-35

Schaffner EMC Inc.In Stock: 1170FN3256H-120-35 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN256-120-35 is determined by the following critical parameters:

• Filter Type & Configuration: Three-phase (Wye) single-stage topology must be maintained
• Current Rating: 120 A continuous current capacity is required
• Mounting & Termination: Chassis mount with terminal block interface must be preserved
• Operating Frequency: DC to 60 Hz operating range must be supported
• Voltage Ratings: Phase-to-ground/neutral and phase-to-phase voltage specifications must meet or exceed the original ratings
• Regulatory Compliance: CSA, ENEC, and UR approvals ensure compatibility with regional standards
• Environmental Specifications: Operating temperature range of -25°C to 100°C must be maintained

The FN3256H-120-35 qualifies as a substitute based on matching all critical parameters while offering enhanced voltage ratings and active product status.

Parameter Comparison

Engineering Selection Recommendations

The FN3256H-120-35 is the appropriate substitute for the obsolete FN256-120-35. Both components maintain identical filter topology, current capacity, mounting configuration, and termination interface. The substitute provides enhanced voltage ratings (300 V phase-to-ground/neutral and 520 V phase-to-phase versus 277 V and 480 V respectively), ensuring compatibility with the original application while offering improved margin for voltage transients. Both parts carry equivalent regulatory approvals (CSA, ENEC, UR) and maintain ROHS3 compliance. The active product status of the FN3256H-120-35 ensures long-term availability and supply chain continuity for new designs and field replacements.

Frequently Asked Questions (FAQ)

Q: Can the FN3256H-120-35 directly replace the FN256-120-35 in existing installations?

A: Yes. Both components share identical filter type, current rating, mounting type, termination style, and operating frequency specifications. The enhanced voltage ratings of the substitute provide additional safety margin without affecting compatibility.

Q: What are the key differences between these two models?

A: The primary differences are product status (obsolete versus active) and voltage ratings. The FN3256H-120-35 provides higher phase-to-ground/neutral (300 V vs. 277 V) and phase-to-phase (520 V vs. 480 V) voltage ratings. Both maintain identical current capacity, topology, and regulatory approvals.

Q: Are the packaging specifications different between these parts?

A: Yes. The FN256-120-35 uses standard packaging, while the FN3256H-120-35 is supplied in tray packaging. This difference does not affect electrical or mechanical compatibility.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the FN256-120-35 and FN3256H-120-35 carry CSA, ENEC, and UR approvals and are ROHS3 compliant, ensuring equivalent regulatory compliance for applications requiring these certifications.

Q: What is the operating temperature range for both filters?

A: Both components operate across the identical temperature range of -25°C to 100°C, ensuring thermal compatibility in equivalent applications.