📝 Description
Used product. The Schaffner FS28315-64-34, with technical identification FN3256H-64-34, is a three-phase EMC/EMI filter with neutral, designed to suppress conducted electromagnetic interference on AC power supply lines. The nameplate identifies a configuration of 3×520/300 V AC, 50–60 Hz, 64 A at 50 °C, with climatic category 25/100/21. The FN3256H series is a family of three-phase filters with neutral intended for power equipment, automation, drives and industrial systems.
⚙️ Technical Specifications
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Brand: Schaffner
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Model: FS28315-64-34
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Series identification: FN3256H-64-34
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Type: three-phase EMC/EMI filter with neutral
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Configuration: 3 phases + N
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Rated voltage: 3×520/300 V AC
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Frequency: 50–60 Hz
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Rated current: 64 A @ 50 °C
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Maximum current of the variant: approx. 70 A at 40 °C according to series data
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Climatic category: 25/100/21
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Filter type: single-stage
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Mounting: chassis / panel
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Connections: L1, L2, L3, N – LINE / LOAD
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Recommended LINE-side torque: 7–8 Nm
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Recommended LOAD-side torque: 4.0–4.5 Nm
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Construction: metal housing
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Manufacturing: Made in Hungary
Schaffner documentation for the FN3256H-64-34 variant also indicates a calculated leakage current of approximately 0.6 mA at 520 V AC/50 Hz and a typical power loss of approximately 17.2 W at rated current.
⚡ Function in the Electrical System
The FS28315-64-34 / FN3256H-64-34 performs the function of an EMC/EMI filter on the three-phase AC power supply circuit.
Its purpose is to attenuate conducted electromagnetic interference, especially high-frequency interference generated by power electronic equipment, preventing or reducing its propagation along the electrical network.
Electrical system type: three-phase AC 3P+N system, particularly suitable for industrial installations, electrical panels, inverters and power converters, motor drives, industrial automation and power electronic equipment.
The Schaffner FN3256H family is intended for three-phase filters with neutral and is used in industrial and energy-management applications; Schaffner also indicates applications in renewable energy, drive systems and power equipment.
In a photovoltaic system, a filter of this type can be used on the AC side of a three-phase inverter, when the inverter voltage, current, configuration and EMC characteristics are compatible. The photographed component does not show a specific photovoltaic inverter model, so it is not correct to attribute it to a particular inverter without additional data.
🔌 Connections and Installation
The filter has four conductors for the LINE side:
L1 – L2 – L3 – N
and the corresponding connections on the:
LOAD → L1' – L2' – L3' – N'
The front marking therefore clearly distinguishes the LINE input from the LOAD output.
The connection must follow the configuration indicated on the nameplate. The filter must be installed to ensure correct electrical and mechanical connection, particularly regarding the tightening of the power terminals.
The -34 version uses connections suitable for high currents; Schaffner documentation indicates a typical maximum cross-section of 35 mm² for rigid conductors and 25 mm² for flexible conductors for this configuration, with a tightening torque of 4.0–4.5 Nm on the connection side specified by the series.
🏭 Applications
The filter is suitable for electrical systems where it is necessary to reduce conducted interference on the three-phase network:
- Three-phase inverters
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ON-GRID photovoltaic inverters, when compatible with the AC circuit
- Power converters
- Motor drives
- Industrial inverters
- Electrical panels
- Industrial automation
- Industrial machinery
- Three-phase power supply systems
- Power electronic equipment
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Renewable energy systems
The FN3256H series is classified by the manufacturer as a three-phase filter with neutral and is offered for power electronics and energy-management applications.
🛡️ Safety and Product Condition
The component is used and shows normal signs of use, scratches and light abrasions on the metal housing, visible in the photographs. The terminals and mounting brackets are present and the technical label is clearly legible.
Electrical operation should not be considered verified in the absence of a specific test.
Before reuse, it is recommended to check:
- continuity of the three phases and neutral;
- insulation between conductors and ground;
- any leakage toward PE;
- condition of the terminals;
- tightening of the connections;
- integrity of the housing;
- correct filter behavior during an electrical test.
This is a component intended for circuits up to 520 V AC phase-to-phase and 300 V AC phase-to-neutral: installation must be carried out exclusively by qualified personnel, with the circuit completely disconnected from the power supply.
📦 Package Contents
- 1 × Schaffner FS28315-64-34
- Mounting brackets and terminals as shown in the photographs.
🚀 Final Description
The Schaffner FS28315-64-34 / FN3256H-64-34 is a 64 A three-phase EMC/EMI filter with neutral, designed for 3P+N systems up to 520/300 V AC and 50–60 Hz.
It is a power component intended to reduce conducted electromagnetic interference in industrial systems, inverters and converters. It can also be used on the AC side of three-phase photovoltaic inverters, provided that the electrical configuration of the system is compatible with the filter specifications.
The high 64 A rated current, L1-L2-L3-N configuration, metal housing and LINE/LOAD connections make it suitable for industrial power equipment and three-phase systems. The FN3256H-64-34 variant is still available on the professional market, with new prices in the range of several hundred euros.
