What this output reactor does on your drive line
The Siemens SIDAC 4EP4003-5DK00 is a 3-phase output reactor rated for 16 A continuous at a switching frequency of 8 kHz, with 0.3 mH inductance per phase. It sits between the VFD output and the motor cable to limit dv/dt and reflected-wave voltage spikes that can damage motor insulation on long cable runs. Thermal class B (130 °C rise) and an ambient rating of 40 °C mean it handles the heat load of continuous PWM duty without derating in a typical ventilated cabinet.
Sizing and fit — what the ratings tell you
At 16 A and 0.3 mH, this reactor is sized for a motor drive in the 7.5–11 kW range on a 400 V supply, depending on the drive's switching frequency and cable length. The 8 kHz switching frequency rating matches modern IGBT drives; running a higher carrier frequency reduces the effective inductance and increases core losses, so stay at or below 8 kHz. Total power loss sums to 130 W (80 W coil + 50 W iron core), which must be dissipated in the panel — allow free air circulation or forced ventilation around the IP00 enclosure.
The reactor measures 0.21 m wide by 0.17 m tall by 0.14 m deep — roughly the footprint of a small contactor but taller. Connection is via screw-type or tab terminals on the main circuit, which accept standard ring or fork lugs for 16 A wiring. Mounting holes or a base plate are typical for bolting to the panel backplate — no DIN rail clip is provided.