FN251-16-07 Equivalent & Substitute Parts

Part Overview

The FN251-16-07 is a three-phase (Delta) EMC/EMI line filter manufactured by Schaffner EMC Inc., rated for 440VAC at 16A with a two-stage configuration. This chassis-mounted filter is designed for general-purpose applications requiring electromagnetic compatibility filtering in three-phase power systems. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications.

Key Parameters

Parameter	FN251-16-07
Manufacturer	Schaffner EMC Inc.
Filter Type	Three Phase (Delta)
Configuration	Two Stage
Voltage - Rated AC	440V
Current Rating	16A
Frequency - Operating	DC ~ 60Hz
Mounting Type	Chassis Mount
Termination Style	Terminal Block, Wire Leads
Inductance	2.6mH
Product Status	Obsolete
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the FN251-16-07 is determined by the following critical parameters:

Filter Type: Three-phase (Delta) configuration is mandatory for compatibility with three-phase power systems
Voltage Rating: The substitute must support the operating voltage of 440VAC or higher
Current Rating: The substitute must support the required current of 16A or higher
Mounting Type: Chassis mount configuration ensures mechanical compatibility
Frequency Range: DC ~ 60Hz operating range must be maintained
Termination Style: Terminal block connection is required for circuit integration

The FN3270H-20-44 qualifies as a substitute based on these parameters: it maintains three-phase (Delta) filtering, supports higher voltage (480VAC) and current (20A) ratings, operates across the same frequency range, uses chassis mounting, and provides terminal block termination.

Parameter Comparison

Parameter	FN251-16-07	FN3270H-20-44	Compatibility Notes
Manufacturer	Schaffner EMC Inc.	Schaffner EMC Inc.	Same manufacturer ensures design consistency
Filter Type	Three Phase (Delta)	Three Phase (Delta)	Identical configuration
Voltage - Rated AC	440V	480V	Substitute rated higher; suitable for 440V operation
Current Rating	16A	20A	Substitute rated higher; suitable for 16A operation
Frequency - Operating	DC ~ 60Hz	DC ~ 60Hz	Identical operating range
Mounting Type	Chassis Mount	Chassis Mount	Identical mounting configuration
Termination Style	Terminal Block, Wire Leads	Terminal Block	Substitute uses terminal block; wire leads not specified
Product Status	Obsolete	Active	Substitute is currently in production
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both meet RoHS requirements
Approval Agency	UR	CSA, ENEC, UR	Substitute has broader certification coverage

Engineering Selection Recommendations

The FN3270H-20-44 is suitable as a substitute for the FN251-16-07 based on the following engineering criteria:

Voltage Compatibility: The 480VAC rating of the substitute exceeds the 440VAC requirement, providing adequate margin for the original application
Current Capacity: The 20A rating of the substitute exceeds the 16A requirement, ensuring sufficient capacity
Product Status: The substitute is an active product with current manufacturing support, addressing the obsolescence of the original part
Regulatory Compliance: The substitute maintains RoHS compliance and extends certification coverage with CSA and ENEC approvals in addition to UR certification
Operational Parameters: Both filters operate across the same frequency range (DC ~ 60Hz) and use identical three-phase (Delta) filtering architecture

Physical dimensions and exact termination lead configurations should be verified during integration to ensure mechanical fit within the existing chassis mounting location.

Frequently Asked Questions (FAQ)

Q: Can the FN3270H-20-44 directly replace the FN251-16-07 in an existing 440VAC, 16A system?

A: Yes, the FN3270H-20-44 is electrically compatible. Its higher voltage (480VAC) and current (20A) ratings exceed the requirements of the original application. However, physical dimensions and mounting hole patterns must be verified to ensure chassis compatibility.

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

A: The FN251-16-07 uses a two-stage configuration, while the FN3270H-20-44 uses a single-stage configuration. Both provide three-phase (Delta) EMC/EMI filtering. The stage configuration affects attenuation characteristics and physical size. Selection depends on specific EMI suppression requirements for the application.

Q: Are there any compliance differences between the two parts?

A: Both parts are RoHS compliant and REACH unaffected. The FN3270H-20-44 carries additional certifications (CSA and ENEC) beyond the UR certification of the FN251-16-07, providing broader regulatory acceptance.

Q: What is the significance of the inductance specification?

A: The FN251-16-07 specifies 2.6mH inductance. The FN3270H-20-44 does not provide an inductance specification in the available data. Inductance affects filter performance at specific frequencies. If inductance is critical to the application, this parameter should be obtained from the manufacturer before final selection.

Q: Does packaging affect the substitution decision?

A: The FN251-16-07 uses standard packaging, while the FN3270H-20-44 is supplied in trays. Packaging affects handling and storage but does not impact electrical or mechanical compatibility. Tray packaging is standard for active production components.

Q: What should be verified before implementing the substitute?

A: Verify chassis mounting dimensions, mounting hole spacing, terminal block pin configuration, and physical clearances. Confirm that the single-stage configuration meets the EMI suppression requirements of the original application. Obtain complete dimensional drawings from Schaffner EMC Inc. for both parts.

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