FN258L-55-07 Equivalent & Substitute Parts

Part Overview

The FN258L-55-07 is a three-phase delta EMC/EMI line filter rated for 55 A with chassis mount configuration and terminal block termination. This component is designed for inverters and power drive systems operating at DC ~ 60Hz frequencies. The part carries a "Not For New Designs" status, making identification of suitable alternatives essential for ongoing system development and maintenance applications.

Substiute Parts

FN258L-55-07

Schaffner EMC Inc.In Stock: 784FN258L-55-07 Datasheet

Current PartRFQ

FN3288-50-53-C35-R65

Schaffner EMC Inc.In Stock: 1082FN3288-50-53-C35-R65 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FN258L-55-07 is determined by the following critical parameters:

• Filter Type: Three Phase (Delta) configuration
• Configuration: Two Stage topology
• Mounting Type: Chassis Mount form factor
• Termination Style: Terminal Block interface
• Frequency Range: DC ~ 60Hz operating capability
• Current Rating: Minimum 50 A (within acceptable tolerance for 55 A applications)
• Voltage Compatibility: Phase-to-phase and phase-to-ground ratings must accommodate the original 480 V / 277 V specification
• RoHS Compliance: ROHS3 Compliant status required
• Regulatory Approvals: Equivalent certification standards

The FN3288-50-53-C35-R65 meets these substitution criteria as an active product alternative.

Parameter Comparison

Engineering Selection Recommendations

The FN3288-50-53-C35-R65 is the designated substitute for the FN258L-55-07 based on the following engineering criteria:

Both components maintain identical three-phase delta filter topology, two-stage configuration, chassis mount form factor, and terminal block termination. Both operate across the DC ~ 60Hz frequency range and carry ROHS3 compliance with equivalent regulatory approvals.

The FN3288-50-53-C35-R65 provides higher voltage ratings (530 V phase-to-phase, 305 V phase-to-ground) compared to the original 480 V / 277 V specification, offering additional design margin. The operating temperature range extends to -40°C, providing enhanced low-temperature performance.

The primary design consideration is the current rating reduction from 55 A to 50 A. This 5 A difference requires verification that the application load does not exceed the substitute component's continuous current capacity. For applications operating consistently below 50 A, the FN3288-50-53-C35-R65 provides a direct functional replacement with enhanced specifications and active product support.

Frequently Asked Questions (FAQ)

Q: Can the FN3288-50-53-C35-R65 directly replace the FN258L-55-07 in existing designs?

A: Direct replacement is possible when application current requirements do not exceed 50 A continuous operation. The substitute component provides identical filter topology, mounting configuration, and termination interface. Verify that peak and continuous current demands remain within the 50 A rating.

Q: What is the significance of the voltage rating difference?

A: The FN3288-50-53-C35-R65 is rated for 530 V phase-to-phase and 305 V phase-to-ground, compared to the original 480 V / 277 V specification. Higher voltage ratings provide additional safety margin and are fully compatible with systems designed for the lower voltage levels.

Q: Why is the FN258L-55-07 marked "Not For New Designs"?

A: This status indicates the component is no longer recommended for new product development. The FN3288-50-53-C35-R65 is an active product with ongoing manufacturer support and should be specified for new applications.

Q: Are there any packaging or inventory considerations?

A: Both components are supplied in tray packaging. The FN3288-50-53-C35-R65 has 1050 pieces in stock, providing availability for production requirements.

Q: Do both components share the same regulatory approvals?

A: Both components are ROHS3 compliant and REACH unaffected. The FN258L-55-07 carries CSA, ENEC, and UR approvals. Verify that the FN3288-50-53-C35-R65 certifications meet your specific application requirements.