Description
Used product. The Schaffner FN258HVIT-55-34 is a 3-phase Schaffner FN258 series EMC/RFI mains filter, designed for the suppression of electromagnetic interference in three-phase systems, inverters, converters, and drive systems. The HVIT version is specifically designed for three-phase networks up to 690 V AC and applications on industrial IT networks. The photographed unit clearly shows 3×690/400 V – 50/60 Hz (Europe), 3×600/350 V – 50/60 Hz (UL, CSA), and 55 A at 50 °C.
⚙️ Technical Specifications
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Brand: Schaffner
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Model: FN258HVIT-55-34
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Series: FN258
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Type: 3-phase EMC/RFI filter
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Configuration: two-stage
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Rated current: 55 A @ 50 °C
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Voltage: 3×690/400 V AC, 50/60 Hz – Europe
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UL/CSA voltage: 3×600/350 V AC, 50/60 Hz
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Operating frequency: DC–60 Hz
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Application: three-phase networks, inverters, and drive systems
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Version: HVIT, for high-voltage IT network applications
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Operating temperature: −25…+100 °C
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Climate class: 25/100/21
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Leakage current: approx. 21.6 mA
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Power loss: approx. 30 W
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Dimensions: approx. 329 × 80 × 185 mm
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Weight: approx. 3.0 kg
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Mounting: frame/chassis mounting
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Connection: terminal block
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Protection rating: IP20
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Overvoltage: category III
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Markings: CSA, UL, ENEC14
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Country of production: Hungary
⚡ Function in the Electrical System
The filter is installed between the three-phase mains and electronic power equipment to attenuate conducted interference generated or propagated along the power lines. The two-stage technology provides high attenuation of EMI/RFI interference, contributing to the electromagnetic compatibility of the system. The FN258 series is specifically designed for inverters, converters, and PDS (Power Drive Systems).
🏭 Construction & Installation
The construction is of the book-style type, with a compact metal enclosure and three-phase terminal block. On the photographed connection side, the terminals LINE L1, L2, L3 are clearly identified; the model provides separate connections for the input and output sides. The nameplate also indicates a recommended tightening torque of 4.0–4.5 Nm for the connections shown. The filter must be installed with proper grounding and wiring suitable for the 55 A current.
🌐 Applications
Suitable for photovoltaic and industrial inverters, power converters, three-phase drives, inverter-driven motors, UPS systems, industrial automation systems, three-phase power supplies, and industrial IT networks. The FN258HVIT series is specifically intended for applications requiring EMC compatibility on three-phase networks up to 690 V AC.
🛡️ Safety & Product Condition
The filter is used, with normal signs of use, scratches, and light abrasions on the metal enclosure and terminals, visible in the photographs. The nameplate carries the warning “HIGH LEAKAGE CURRENT – first connect to earth”: the PE protective conductor must be connected before the other connections. The relatively high leakage current requires particular attention to system design and residual-current protection. Operation is not declared as tested. Before use, verify insulation, PE continuity, terminal tightening, and correct correspondence between LINE and LOAD.
📦 Package Contents
1 × Schaffner FN258HVIT-55-34, 55 A three-phase EMC/RFI filter, complete with the enclosure and terminal blocks visible in the photographs.
🚀 Final Description
The Schaffner FN258HVIT-55-34 is a high-power industrial EMC filter for three-phase systems up to 690 V AC and 55 A, featuring a two-stage configuration and HVIT design for applications on industrial IT networks. Its compact construction, high-current terminal block, and high EMI/RFI attenuation capability make it particularly suitable as a replacement component for inverters, drives, and electronic power equipment. The model is currently obsolete/discontinued, increasing its interest as an original industrial replacement.
