FN251-24-07 Equivalent & Substitute Parts

Part Overview

The FN251-24-07 is a three-phase delta EMC/EMI line filter rated for 440VAC at 24A, designed for general-purpose applications requiring chassis-mount installation. This part is classified as obsolete, making identification of suitable substitute components essential for system redesign, maintenance planning, and procurement continuity. The filter provides two-stage filtering with terminal block and wire lead termination, operating across DC to 60Hz frequency range.

Substiute Parts

FN251-24-07

Schaffner EMC Inc.In Stock: 791FN251-24-07 Datasheet

Current PartRFQ

FN3270H-35-33

Schaffner EMC Inc.In Stock: 1049FN3270H-35-33 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The FN3270H-35-33 qualifies as a substitute based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Filter Type: Three Phase (Delta) configuration maintained
• Mounting Type: Chassis Mount preserved
• Frequency Range: DC ~ 60Hz operating range consistent
• Voltage Class: Both operate in industrial three-phase voltage range (440V vs. 480V)
• Current Capacity: Substitute rated at 35A exceeds original 24A requirement
• Termination: Terminal Block available on substitute
• RoHS Compliance: Both parts meet RoHS standards
• REACH Status: Both parts REACH Unaffected

Substitution Basis: The FN3270H-35-33 represents a higher-capacity variant within Schaffner's three-phase delta filter portfolio. The 480V/35A rating provides electrical headroom above the original 440V/24A specification, accommodating standard industrial voltage tolerances and load variations. The single-stage configuration of the substitute differs from the two-stage design of the original part; however, this represents a functional upgrade in filtering architecture rather than a degradation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution: The FN3270H-35-33 is suitable for applications currently using the FN251-24-07 where the following conditions are met:

• System voltage tolerance accommodates 480V operation (standard industrial three-phase systems typically support ±10% voltage variation)
• Load current does not exceed 24A (the substitute's 35A rating provides margin without derating concerns)
• Chassis mounting footprint and termination block compatibility with existing installation geometry
• Single-stage filtering performance meets EMC/EMI requirements of the application

Compliance Advantage: The FN3270H-35-33 carries active product status with expanded approval certifications (CSA, ENEC, UR versus UR only), providing superior long-term availability and regulatory support. ROHS3 compliance represents current environmental standards alignment.

Consideration: The transition from two-stage to single-stage filtering represents a design change. Applications with stringent harmonic suppression or noise attenuation requirements should evaluate whether single-stage performance meets specification limits.

Frequently Asked Questions (FAQ)

Q: Can the FN3270H-35-33 directly replace the FN251-24-07 in a 440V system?

A: Yes, provided the system voltage tolerance accommodates 480V operation. Industrial three-phase systems typically operate within ±10% of nominal voltage, making 480V compatible with 440V-rated equipment. Verify system voltage range in your installation documentation.

Q: What is the impact of changing from two-stage to single-stage filtering?

A: Single-stage filtering reduces component count and insertion loss while maintaining three-phase delta EMC/EMI filtering function. Applications requiring specific harmonic attenuation or noise floor specifications should compare measured performance data between configurations.

Q: Is the higher current rating (35A vs. 24A) a concern?

A: No. The substitute's 35A rating provides operational margin for the original 24A load. Higher current capacity does not degrade performance at lower current levels.

Q: Are termination differences significant?

A: The original part includes both terminal block and wire leads. The substitute provides terminal block termination. Verify that your installation uses terminal block connection; if wire lead connection is required, mechanical adaptation may be necessary.

Q: What is the inventory advantage?

A: The FN3270H-35-33 is in active production with 1035 units in stock versus 774 units for the obsolete FN251-24-07. Active status ensures continued availability for future procurement cycles.

Q: Do approval certifications differ?

A: Yes. The substitute carries CSA, ENEC, and UR approvals versus UR only for the original. Expanded certifications support broader geographic regulatory compliance and system integration scenarios.