The Siemens 4EP4010-0AK00 is a 3-phase line reactor (choke) rated for 13.5 A continuous current with a maximum of 15 A, 4 mH inductance, designed for 400 V AC line operation at 50 Hz. It's built to thermal class B per IEC 60085, meaning it handles a 130 °C temperature rise at a 40 °C ambient — standard for motor-drive line reactors in industrial panels.
Sizing and fit for the BOM line
At 219 mm wide, 179 mm tall, and 143 mm deep, this reactor occupies a moderate footprint on the panel backplate or DIN-rail mounting plate. The screw-type and tab terminals accept standard ring or fork lugs for the main circuit wiring — no special crimp tooling needed. Total power loss is 82.81 W (72.9 W in the coil, 9.91 W in the iron core), so factor that heat into your cabinet ventilation calculation; at 40 °C ambient, you'll want airflow across the core to stay within the thermal class B rise limit.