FN256-8-46 Equivalent & Substitute Parts

Part Overview

The FN256-8-46 is a three-phase (Wye) EMC/EMI line filter rated for 8 A with chassis mount configuration and terminal block termination. This component is classified as obsolete, making identification of compatible substitute parts essential for system maintenance and new design implementations. The FN3256H-8-29 serves as the direct substitute, offering equivalent electrical performance with active product status and enhanced voltage ratings.

Substiute Parts

FN256-8-46

Schaffner EMC Inc.In Stock: 816FN256-8-46 Datasheet

Current PartRFQ

FN3256H-8-29

Schaffner EMC Inc.In Stock: 1080FN3256H-8-29 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN256-8-46 with the FN3256H-8-29 is valid based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Filter Type: Both are three-phase (Wye) configurations
• Current Rating: Both rated for 8 A
• Configuration: Both single-stage designs
• Frequency Range: Both operate DC ~ 60Hz
• Mounting: Both chassis mount with terminal block termination
• Operating Temperature: Identical range of -25°C ~ 100°C
• Regulatory Approvals: Both hold CSA, ENEC, and UR certifications

Enhanced Ratings in Substitute: The FN3256H-8-29 provides higher voltage margins with phase-to-ground/neutral rating of 300 V and phase-to-phase rating of 520 V, compared to the original 277 V and 480 V respectively. These increased ratings ensure compatibility in applications originally designed for the FN256-8-46.

Parameter Comparison

Engineering Selection Recommendations

The FN3256H-8-29 is the appropriate substitute for the obsolete FN256-8-46 based on product lifecycle and regulatory compliance. The substitute maintains identical current capacity, frequency range, and mechanical form factor while providing enhanced voltage ratings. Both components hold equivalent regulatory certifications from CSA, ENEC, and UR, ensuring compliance continuity. The FN3256H-8-29 carries active product status, ensuring long-term availability and supply chain reliability compared to the obsolete FN256-8-46.

Frequently Asked Questions (FAQ)

Q: Can the FN3256H-8-29 directly replace the FN256-8-46 in existing applications?

A: Yes. Both components share identical current ratings (8 A), filter type (three-phase Wye), configuration (single stage), frequency range (DC ~ 60Hz), mounting type (chassis mount), and termination style (terminal block). The FN3256H-8-29 provides higher voltage ratings, making it suitable for applications originally designed for the FN256-8-46.

Q: What is the difference in voltage ratings between these parts?

A: The FN256-8-46 is rated 277 V phase-to-ground/neutral and 480 V phase-to-phase. The FN3256H-8-29 is rated 300 V phase-to-ground/neutral and 520 V phase-to-phase. The substitute offers higher voltage margins while maintaining compatibility with the original application requirements.

Q: Are both parts certified by the same regulatory agencies?

A: Yes. Both the FN256-8-46 and FN3256H-8-29 hold approvals from CSA, ENEC, and UR. The FN3256H-8-29 additionally meets ROHS3 compliance, compared to RoHS compliance for the original part.

Q: Why is the FN256-8-46 listed as obsolete?

A: The FN256-8-46 has reached end-of-life status. The FN3256H-8-29 represents the current active product offering from Schaffner EMC Inc. for this application category, ensuring continued availability and support.

Q: Are there any mechanical differences between these chassis mount filters?

A: Both components feature identical chassis mount configuration with terminal block termination. No mechanical modifications are required for substitution in existing designs.