The Siemens 4EU2752-5UB00-0AA0 is a three-phase mains choke (line reactor) designed for installation ahead of variable frequency drives. It smooths incoming power, limits harmonic distortion, and reduces voltage notching that can damage drive input stages.
Operating voltage is 400 or 480 V AC, covering the standard three-phase industrial mains in most regions. The 50/60 Hz frequency rating means it works on either 50 Hz or 60 Hz networks without derating. Coil power loss is 172 W; iron core loss is 91 W. This open-frame (IP00) component relies on enclosure airflow for cooling. Thermal class H insulation allows continuous operation at 40 °C ambient without derating. Termination is via flat-type connectors (bus-bar style), not ring lugs or screw clamps — plan your cable lugs or bus-bar interface accordingly.
It carries UL/CSA recognition per EN 61558-2-20, so it is accepted in North American panels that require listed components. No separate UL file number is listed here, but the marking on the nameplate is the compliance artefact.