The Siemens 4EU2752-0ER00-0BA0 is a three-phase mains choke (Netzdrossel) rated for 400 V AC line voltage, 260 A continuous current with a 289 A maximum, and 0.15 mH inductance. It's built to EN 61558-2-20 for power transformers and reactors — the standard that governs thermal and dielectric endurance under load.
Key ratings and their meaning
The 260 A rated current (289 A maximum) is the continuous thermal limit under the rated 45°C ambient — push beyond that and the Class H insulation (180°C rated, per IEC 60085) still gives headroom, but the voltage drop across the choke climbs. That drop is measured at the fundamental frequency; it's higher for harmonic currents, which is exactly what the choke is there to suppress.
Physical footprint: 0.27 m wide, 0.248 m tall, 0.208 m deep. That's a substantial block — plan for a DIN-rail or baseplate mount inside a cabinet with enough clearance for airflow. The IP00 rating means no touch protection on the terminals; the enclosing panel must provide the IP2X or better. Thermal class H allows a 180°C hot-spot, so forced ventilation or a larger enclosure may be needed if ambient inside the panel exceeds 45°C.