Mains Choke for Variable-Frequency Drives
Its primary job is to limit harmonic distortion, reduce current spikes from the line, and protect the drive's DC bus from voltage notching. The 0.075 mH inductance at 351 A rated current (390 A maximum) provides a 4% relative inductive voltage drop at the rated operating point — a typical value for a drive input choke that balances harmonic mitigation against voltage drop across the reactor. Rated for 400 V AC / 480 V AC at 50/60 Hz, continuous duty at 45 °C ambient with thermal class H insulation. IP00 open-frame enclosure requires panel mounting.
Sizing and Thermal Reality
The 351 A rated current is the continuous RMS value the choke can carry at 45 °C ambient without exceeding the H-class temperature rise. The 390 A maximum figure likely represents a short-time overload or the thermal-magnetic trip threshold of an upstream protective device — not a continuous rating. Total power loss sums to 460 W (260 W in the coil, 200 W in the iron core), which must be dissipated as heat inside the enclosure. For a panel designer, that means accounting for nearly half a kilowatt of additional heat load when sizing ventilation or air conditioning.
Physical Fit and Termination
Measures 0.35 m wide by 0.321 m tall by 0.237 m deep. Main circuit terminates via flat-type connectors.
The choke is designed to EN 61558-2-20 (safety of transformers, reactors, and power supply units) and carries UL/CSA recognition per the description line. Thermal class H per IEC 60085 confirms the insulation system can sustain a 180 °C hot-spot temperature. No specific RoHS or REACH declaration appears in the evidence, but Siemens typically provides compliance documentation on request for EU-market products.