Description

Used product. Schaffner FS21858-55-34 three-phase mains filter, reference FN3258-55-34, designed to suppress EMC/RFI interference in industrial systems, inverters, converters, and drives.

⚙️ Technical Specifications

• Schaffner FS21858-55-34
• Reference: FN3258-55-34
• 3 × 480/275 VAC
• 50/60 Hz
• Rated current: 55 A @ 50 °C
• Three-phase Delta configuration
• 1-stage EMC/RFI filter
• Connection via power terminals
• Chassis mounting
• Operating temperature −25…+100 °C
• Leakage current approx. 33 mA
• Power loss approx. 25.9 W
• Dimensions approx. 250 × 90 × 85 mm
• Protection rating IP20

⚡ Function in the Electrical System

The filter reduces conducted electromagnetic interference generated by power equipment, contributing to the EMC compatibility of the system. The FN3258 series is intended for inverters, converters, three-phase drives, servo drives, and industrial equipment.

🏭 Identification and Connections

The photographed nameplate clearly shows:
FS21858-55-34, FN3258-55-34, 3×480/275VAC 50/60Hz, 55A @ 50°C, 25/100/21, 1021R, MADE IN THAILAND.
The following are also visible:

• Bonfiglioli Part No.: SA0200084 FTV055A
• Vectron-T-Nr.: 185691055
• CSA, UL and ENEC14 markings
• LINE L1/L2/L3 and LOAD L1’/L2’/L3’ connections
• HIGH LEAKAGE CURRENT – first connect to earth! indication

🛡️ Safety and Product Condition

The filter shows normal signs of use and installation, with light abrasions on the metal structure and terminals. Functionality is not declared without specific testing.
⚠️ 55 A / 480 VAC: component intended for power circuits. Connection must be carried out by qualified personnel, respecting LINE/LOAD, phase sequence, and PE connection. The high leakage current warning shown on the component requires particular attention to the earth connection.

📦 Package Contents

• 1 × Schaffner FS21858-55-34
• Reference FN3258-55-34
• In the visible cosmetic condition shown in the photographs.

🚀 Final Description

Schaffner FS21858-55-34 / FN3258-55-34 three-phase EMC/RFI filter, 55 A, 480 VAC, Delta configuration and single stage, suitable for inverters, converters, and industrial power systems. The FN3258-55-34 model is still commercially available as a 55 A, 480 VAC Schaffner three-phase filter, with terminal block and chassis mounting.