Description

Used product. The Schaffner FN258P-100-35 is a 3-phase low-leakage-current EMC/RFI filter, designed for high-power industrial applications, particularly inverters, drives, and electrical power-conversion systems. The code on the nameplate identifies the exact model FN258P-100-35.
The nameplate indicates 3×480/275 V, 50–60 Hz and 100 A at 50 °C. The FN258P series is a family of two-stage 3-phase filters with a Delta configuration, developed to achieve high interference attenuation while maintaining low leakage current.

⚙️ Technical Specifications

• Brand: Schaffner
• Model: FN258P-100-35
• Type: 3-phase EMC/RFI mains filter
• Configuration: Three Phase – Delta
• Number of stages: 2 stages
• Rated current: 100 A @ 50 °C
• Nameplate voltage: 3×480/275 VAC
• Frequency: 50–60 Hz
• Phase-to-phase voltage: 480 VAC
• Phase-to-earth voltage: 275 VAC
• Leakage current: <3.5 mA according to model data
• Operating temperature: −25…+100 °C
• Mounting: Chassis/panel mounting
• Connection: Screw terminals
• Dimensions: approximately 379 × 90 × 220 mm
• Power dissipation: approximately 51 W
• Application: Inverters and drive systems
• Certifications: CSA, ENEC, UR
• Flammability rating: UL94 V-0
• Construction: Shielding metal housing
  The FN258P-100-35 model is also identified by manufacturer code 800837. The component is currently classified as obsolete/EOL by some distributors, while replacements from newer generations are available.

⚡ Function in the Electrical System

The filter is installed in series on the 3-phase line, between the mains or power output and the equipment being protected.
The two-stage configuration attenuates conducted interference generated by power electronic equipment, contributing to compliance with EMC requirements and limiting the propagation of interference toward the electrical network.
It is particularly suitable for inverters, converters, motor drives, and industrial 3-phase systems.

🏭 Construction & Installation

The filter features a robust metal book-style housing, designed for installation inside an electrical cabinet or directly onto the equipment chassis.
The photographs clearly show the 3-phase L1, L2, and L3 terminals on the LINE side, while the opposite side is identified as LOAD. A PE connection with its corresponding earth conductor is also present.
The nameplate carries the warning:
“HIGH LEAKAGE CURRENT – first connect to earth!”
The PE connection must therefore be made before the power conductors. The terminals must be tightened according to the manufacturer's specified torque; a recommended torque in the range of 7–8 Nm is indicated on the terminal section of the component.

🌐 Applications

The FN258P-100-35 is suitable for:

• Industrial inverters
• Motor drives
• Static converters
• Industrial automation systems
• High-power power supplies
• 3-phase electrical switchboards
• Energy-conversion systems
• Applications requiring low EMC leakage current
  The model is specifically classified for applications with inverters and Power Drive Systems.

🛡️ Safety & Product Condition

The component is used, with normal installation marks, superficial scratches, and handling traces on the metal housing. The photographs show an overall intact structure and the terminals are present.
Electrical operation is not declared without testing. Before installation, it is recommended to verify insulation, PE continuity, terminal integrity, and correct filter attenuation.
As this component is intended for 480 VAC and 100 A, it must be installed exclusively by qualified personnel. The earth connection is particularly important due to the leakage current specified for the device.

📦 Package Contents

• 1 × Schaffner FN258P-100-35
• 100 A 3-phase EMC/RFI filter
• Metal housing and power terminals as shown in the photographs

🚀 Final Description

The Schaffner FN258P-100-35 is a professional EMC filter from the Schaffner FN258P series, featuring 100 A rated current, 480 VAC, 3-phase Delta configuration, and two-stage technology. The P version is specifically oriented toward applications where maintaining low leakage current is important, making it particularly suitable for industrial inverters and drives. The model is now obsolete, increasing the interest of the used component as a replacement for existing equipment.