The SIDAC 4EU2552-0EB00-4BA0 is a 3-phase AC output reactor (also called an output choke) designed to sit between a variable-frequency drive and the motor. Its job is to limit the rate of voltage rise (dV/dt) and reduce reflected-wave peaks on long cable runs — a common cause of premature motor insulation failure in PWM drive systems. The reactor is rated for a 4 kHz switching frequency, with a maximum of 8 kHz, and carries 81 A continuous at 500 V. Inductance is 0.19 mH, and the impedance voltage (UK) is 7% — a typical figure for motor-protection duty. The unit is built to thermal class H (180 °C insulation system) per IEC 60085, so it handles the heat rise from the 105.1 W coil loss and 59 W iron-core loss without derating at the rated 40 °C ambient.
The reactor is an open-frame IP00 assembly — no enclosure, no conduit knockouts. It measures 0.22 m wide by 0.21 m tall by 0.16 m deep, and the main current connections are flat-type terminals. Mounting is via the core frame directly to a backplate or sub-panel; plan for adequate clearance around the unit for airflow, since the combined heat dissipation is roughly 164 W.