FN256-25-47 Equivalent & Substitute Parts

Part Overview

The FN256-25-47 is a three-phase (Wye) EMC/EMI line filter rated for 25 A with chassis mount configuration and terminal block termination. This component is designed for general-purpose applications requiring electromagnetic compatibility filtering in three-phase power systems. The part is currently obsolete, making identification of suitable substitute components necessary for ongoing system maintenance and new designs requiring equivalent filtering performance.

Substiute Parts

FN256-25-47

Schaffner EMC Inc.In Stock: 1047FN256-25-47 Datasheet

Current PartRFQ

FN3256H-25-33

Schaffner EMC Inc.In Stock: 822FN3256H-25-33 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN256-25-47 is based on the following critical parameters that must remain equivalent or superior:

• Filter Type: Three Phase (Wye) configuration
• Current Rating: 25 A minimum
• Voltage Rating: Phase-to-phase and phase-to-ground ratings must meet or exceed the original specifications
• Configuration: Single Stage filtering
• Mounting and Termination: Chassis mount with terminal block termination
• Operating Frequency: DC ~ 60Hz capability
• Temperature Range: -25°C ~ 100°C operating capability
• Regulatory Compliance: CSA, ENEC, and UR approvals

The FN3256H-25-33 meets these substitution criteria as a direct equivalent from the same manufacturer with enhanced voltage ratings and active product status.

Parameter Comparison

Engineering Selection Recommendations

The FN3256H-25-33 is the direct substitute for the obsolete FN256-25-47. Both components are manufactured by Schaffner EMC Inc. and maintain identical current ratings, filter topology, and operating frequency specifications. The substitute part provides enhanced voltage ratings (300 V phase-to-ground and 520 V phase-to-phase versus 277 V and 480 V respectively), offering improved margin for applications operating at the upper end of the original specification range.

The FN3256H-25-33 holds active product status with current manufacturing support, whereas the FN256-25-47 is obsolete. Both components maintain equivalent regulatory compliance with CSA, ENEC, and UR approvals. The substitute part meets ROHS3 compliance, representing current environmental standards. Mechanical compatibility is maintained through identical chassis mount configuration and terminal block termination.

Frequently Asked Questions (FAQ)

Q: Can the FN3256H-25-33 directly replace the FN256-25-47 in existing designs?

A: Yes. Both components share identical current ratings (25 A), filter topology (three-phase Wye), configuration (single stage), mounting type (chassis mount), and termination style (terminal block). The substitute part provides higher voltage ratings, making it suitable for applications operating at or below the original specifications.

Q: What is the primary difference between these two parts?

A: The FN3256H-25-33 provides enhanced voltage ratings (300 V phase-to-ground and 520 V phase-to-phase) compared to the FN256-25-47 (277 V and 480 V respectively). The substitute part is also active in production, whereas the original is obsolete.

Q: Are the packaging formats compatible?

A: The FN256-25-47 uses standard packaging, while the FN3256H-25-33 is supplied in tray packaging. Both maintain identical physical form factors for chassis mount installation.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the FN256-25-47 and FN3256H-25-33 carry CSA, ENEC, and UR approvals. The substitute part additionally meets ROHS3 compliance standards.

Q: What operating frequency range do these filters support?

A: Both components operate across DC ~ 60Hz frequency range, supporting DC applications and standard 50/60Hz AC power systems.