Description
Used product. The Schaffner FN258P-42-33 is a two-stage 3-phase EMC/RFI filter, designed to suppress conducted electromagnetic interference in industrial power applications. The model is clearly identified on the nameplate as FN258P-42-33, with production Made in Thailand.
The nameplate shows 3×480/275 V – 50/60 Hz and 42 A @ 50 °C. The configuration is 3-phase Delta, with LINE input and LOAD output connections on L1, L2, L3 and PE, respectively.
⚙️ Technical Specifications
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Brand: Schaffner
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Model: FN258P-42-33
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Type: 3-phase EMC/RFI mains filter
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Configuration: Three Phase – Delta
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Technology: Two-stage
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Rated current: 42 A @ 50 °C
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Voltage: 3×480/275 V
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Frequency: 50–60 Hz
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Input: LINE – L1, L2, L3, PE
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Output: LOAD – L1', L2', L3', PE
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Mounting: Chassis/panel mounting
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Operating temperature: −25…+100 °C
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Flammability rating: UL94 V-0
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Certifications: CSA, ENEC, UR
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Manufacturing: Made in Thailand
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Approx. dimensions: 329 × 70 × 185 mm
⚡ Function in the Electrical System
The filter is installed in series on the 3-phase line, between the power supply and the connected equipment. The two-stage technology attenuates conducted electromagnetic interference, reducing the propagation toward the electrical network of interference generated by electronic equipment. It is particularly suitable for inverters, converters, motor drives, and industrial power systems.
🏭 Construction & Installation
The component features a robust shielding metal housing with separate 3-phase terminals for input and output. The photographs clearly show the LINE and LOAD markings, with identification of the three phases L1, L2, and L3. 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 must therefore be connected before the power conductors. The terminals must be correctly tightened according to the manufacturer's instructions.
🌐 Applications
The FN258P-42-33 is suitable for 3-phase inverters, power converters, Power Drive Systems, industrial drives, automation systems, industrial power supplies, and electrical switchboards where proper EMC interference management is required.
🛡️ Safety & Product Condition
The component is used, with normal installation marks, superficial scratches, and handling traces on the metal housing and terminals. No significant structural breaks are evident in the photographs. Electrical operation is not declared without specific testing.
Before installation, it is recommended to verify insulation, PE continuity, terminal integrity, correct tightening, and filter attenuation. As it is intended for 480 VAC and 42 A, it must be installed exclusively by qualified personnel.
📦 Package Contents
1 × Schaffner FN258P-42-33, 42 A 3-phase EMC/RFI filter, complete with metal housing, terminals, and PE connection as shown in the photographs.
🚀 Final Description
The Schaffner FN258P-42-33 is a professional 42 A 3-phase industrial EMC filter, with 3×480/275 V voltage, 50–60 Hz frequency, and two-stage technology. The Delta configuration and design for industrial power applications make it particularly interesting as a replacement for inverters, drives, and converters. The model is currently of limited availability on the market, increasing the interest of the component as a used industrial replacement part.
