The Siemens 4EP4000-1QS00 is a 3-phase AC output reactor from the SIDAC series, rated for a maximum continuous current of 15.5 A and a rated frequency of 8000 Hz. It's designed to sit between a variable-frequency drive and the motor, smoothing the voltage spikes and limiting the rate of rise (dV/dt) that long cable runs or fast-switching IGBTs can cause. The 0.7 mH inductance and 350 V voltage class (per the description) tell you it's sized for a specific motor load impedance — not a generic filter. Screw terminals for the main circuit keep wiring straightforward for a panel builder.
The 8000 Hz rated frequency is the key number here — that's the switching frequency of the drive's output stage, not the motor's running speed. If your drive's IGBTs are switching at 8 kHz or below, this reactor is in its sweet spot. Push the carrier frequency higher and the core losses climb; you'd derate or look for a reactor rated for 12 or 16 kHz. The 15.5 A maximum is the thermal current limit at 40 °C ambient (the rated ambient temperature). That's the continuous RMS current the reactor can carry without exceeding Class B insulation temperature rise (130 °C total, per IEC 60085). If your motor draws 14 A full-load and the drive is sized for 15 A, this reactor is matched. The 65 W coil loss plus 45 W iron core loss — 110 W total — is heat that stays inside the panel, so factor it into your enclosure cooling calculation.
Dimensions: 0.21 m wide, 0.17 m tall, 0.14 m deep. IP00 open-frame. Screw terminals.