FN251-4-07 Equivalent & Substitute Parts

Part Overview

The FN251-4-07 is a three-phase (delta) EMC/EMI line filter manufactured by Schaffner EMC Inc., rated for 440VAC at 4A with chassis mount configuration. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing system maintenance and new designs. The filter provides two-stage filtering with terminal block and wire lead termination, suitable for general-purpose applications requiring electromagnetic compatibility control in three-phase power distribution systems.

Substiute Parts

FN251-4-07

Schaffner EMC Inc.In Stock: 794FN251-4-07 Datasheet

Current PartRFQ

FN3270H-10-44

Schaffner EMC Inc.In Stock: 1087FN3270H-10-44 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN251-4-07 is based on the following critical parameters that define functional equivalence in three-phase EMC/EMI line filter applications:

Primary Substitution Criteria:

• Filter Type: Three Phase (Delta) configuration
• Mounting Type: Chassis Mount
• Operating Frequency: DC ~ 60Hz compatibility
• Voltage Class: AC voltage rating suitable for the application
• Current Rating: Equal to or greater than the original 4A specification
• Termination Style: Terminal block configuration for circuit integration

The substitute part FN3270H-10-44 maintains the three-phase delta filter topology and chassis mount configuration. While the substitute operates at a higher voltage rating (480VAC) and current capacity (10A), these parameters represent an uprated design within the same product family, providing enhanced capability for equivalent or higher-demand applications.

Parameter Comparison

Engineering Selection Recommendations

The FN3270H-10-44 serves as an active substitute for the obsolete FN251-4-07. Selection of this substitute is supported by the following engineering factors:

Product Status: The FN251-4-07 is classified as obsolete, making the FN3270H-10-44 the appropriate active-status alternative from Schaffner EMC Inc.

Compliance and Certifications: The FN3270H-10-44 carries expanded approval agency certifications (CSA, ENEC, UR) compared to the original part (UR only), providing broader regulatory acceptance. Both parts maintain RoHS compliance, with the substitute meeting the more recent ROHS3 standard.

Electrical Compatibility: The substitute operates at 480VAC with 10A capacity, representing an uprated design relative to the original 440VAC/4A specification. This uprating accommodates equivalent or higher-demand three-phase power distribution scenarios while maintaining the same operating frequency range (DC ~ 60Hz).

Mechanical Integration: Both parts feature chassis mount configuration with terminal block termination, ensuring compatible physical and electrical integration into existing enclosure designs.

Frequently Asked Questions (FAQ)

Q: Can the FN3270H-10-44 directly replace the FN251-4-07 in a 440VAC/4A application?

A: Yes. The FN3270H-10-44 is rated for 480VAC/10A, which exceeds the original 440VAC/4A requirements. The substitute operates within the same frequency range (DC ~ 60Hz) and maintains three-phase delta filter topology with chassis mount configuration.

Q: What is the difference between two-stage and single-stage filter configurations?

A: The FN251-4-07 employs two-stage filtering, while the FN3270H-10-44 uses single-stage configuration. Both provide EMC/EMI line filtering for three-phase systems. The stage count reflects internal component architecture; both designs are suitable for general-purpose and inverter/power drive applications.

Q: Are there termination differences between these parts?

A: The FN251-4-07 includes both terminal block and wire leads, while the FN3270H-10-44 provides terminal block termination. Terminal block configuration is common to both parts, supporting standard circuit integration methods.

Q: Does the higher voltage and current rating of the substitute affect compatibility?

A: No. Higher voltage and current ratings represent design margin and capability enhancement. The substitute operates safely in applications rated at or below its specifications, including the original 440VAC/4A requirement.

Q: What compliance standards apply to the substitute part?

A: The FN3270H-10-44 carries CSA, ENEC, and UR approvals, with ROHS3 compliance. These certifications exceed the original part's UR approval and RoHS compliance, providing enhanced regulatory coverage for international applications.

Q: Is the inductance value of 7mH for the FN251-4-07 matched in the substitute?

A: Inductance data is not provided for the FN3270H-10-44. Inductance specifications are determined by filter design and stage configuration; the single-stage design of the substitute may differ from the two-stage original. Contact the manufacturer for specific inductance values if this parameter is critical to the application.