FN351-50-33 Equivalent & Substitute Parts

Part Overview

The FN351-50-33 is a three-phase delta EMC/EMI line filter rated for 50 A operation across DC to 60 Hz frequency range. This component is designed for chassis mount applications with terminal block termination, serving inverters and power drive systems. The FN351-50-33 is classified as obsolete, necessitating identification of active equivalent models to maintain system continuity and ensure ongoing component availability for new designs and field replacements.

Substiute Parts

FN351-50-33

Schaffner EMC Inc.In Stock: 2780FN351-50-33 Datasheet

Current PartRFQ

FN351H-50-33

Schaffner EMC Inc.In Stock: 783FN351H-50-33 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN351-50-33 with the FN351H-50-33 is based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Filter Type: Three Phase (Delta) configuration maintained
• Current Rating: 50 A identical specification
• Frequency Range: DC ~ 60 Hz identical specification
• Mounting Type: Chassis Mount identical specification
• Termination Style: Terminal Block identical specification
• Applications: Inverters, Power Drive Systems identical specification
• Approval Agencies: CSA, ENEC, UR certifications maintained
• RoHS Status: ROHS3 Compliant maintained
• Base Product Number: FN351 series consistency

Differing Parameters:

• Voltage ratings increased on FN351H-50-33 (Phase to Ground/Neutral: 300 V vs. 250 V; Phase to Phase: 520 V vs. 440 V)
• Operating temperature range extended on FN351H-50-33 (-25°C ~ 100°C vs. -25°C ~ 85°C)
• Product Status: FN351H-50-33 is Active; FN351-50-33 is Obsolete

The FN351H-50-33 provides enhanced voltage and thermal performance while maintaining identical current handling, frequency response, and mechanical interface characteristics.

Parameter Comparison

Engineering Selection Recommendations

The FN351H-50-33 is the direct active equivalent for the obsolete FN351-50-33. Both components maintain identical current handling capacity, frequency response, and mechanical interface specifications required for inverter and power drive system applications.

Selection of the FN351H-50-33 is supported by:

• Product Status: The FN351H-50-33 is an active product with current manufacturing support, whereas the FN351-50-33 is obsolete with no ongoing production
• Regulatory Compliance: Both components maintain CSA, ENEC, and UR certifications and ROHS3 compliance
• Enhanced Performance: The FN351H-50-33 provides increased voltage ratings (300 V phase-to-ground and 520 V phase-to-phase) and extended operating temperature range (-25°C ~ 100°C), offering improved margin for system applications
• Mechanical Compatibility: Identical chassis mount configuration and terminal block termination ensure direct installation compatibility

Frequently Asked Questions (FAQ)

Q: Can the FN351H-50-33 be used as a direct replacement for the FN351-50-33?

A: Yes. Both components share identical current rating (50 A), frequency range (DC ~ 60 Hz), filter type (three-phase delta), mounting configuration (chassis mount), and termination style (terminal block). The FN351H-50-33 provides higher voltage ratings and extended operating temperature range, making it suitable for applications previously served by the FN351-50-33.

Q: What are the key differences between these two models?

A: The primary differences are voltage ratings and operating temperature range. The FN351H-50-33 is rated for 300 V phase-to-ground and 520 V phase-to-phase, compared to 250 V and 440 V on the FN351-50-33. The FN351H-50-33 operates to 100°C maximum, versus 85°C for the FN351-50-33. The FN351H-50-33 is an active product; the FN351-50-33 is obsolete.

Q: Are the physical dimensions and mounting interfaces identical?

A: Both components feature chassis mount configuration with terminal block termination. No dimensional or interface data is provided in the component specifications; physical verification is required for specific installation applications.

Q: Do both components carry the same regulatory certifications?

A: Yes. Both the FN351-50-33 and FN351H-50-33 carry CSA, ENEC, and UR approvals and are ROHS3 compliant. Both are classified as REACH Unaffected and carry EAR99 ECCN designation.

Q: Which component should be selected for new designs?

A: The FN351H-50-33 should be selected for new designs. It is an active product with ongoing manufacturing support and provides enhanced voltage and thermal performance specifications compared to the obsolete FN351-50-33.

Q: Are there any frequency or current limitations when substituting these components?

A: No. Both components operate across the identical DC ~ 60 Hz frequency range and are rated for 50 A current. No frequency or current derating is required when substituting the FN351H-50-33 for the FN351-50-33.