What this choke does in the drive line
The Siemens 4EP3701-2DS00 is a 3-phase commutating choke for converter applications. It limits the rate of rise of current (di/dt) during thyristor or IGBT switching, reducing harmonics and protecting the converter's semiconductors. Rated for 500 V AC at 50 Hz, it carries a continuous current of 16.2 A with a maximum of 18 A, and provides 2 mH inductance per phase with a 4% relative inductive voltage drop at rated conditions.
Current handling and thermal limits
The rated current of 16.2 A (maximum 18 A) is the continuous thermal limit at 40 °C ambient. At DC the choke can handle 22 A, reflecting the lower AC core losses. Total power loss splits between the coil (55 W) and the iron core (12 W), with thermal class B insulation per IEC 60085 — a 130 °C temperature class that gives margin in a 40 °C ambient.
Integration and connections
The choke measures 0.178 m wide, 0.153 m high, and 0.105 m deep — a compact footprint for a 3-phase line reactor in this current class. Panel layout should account for the 0.105 m depth when positioning against the backplane or adjacent components.