What this choke does in the drive line
The Siemens 4EP3702-2DS00 is a 3-phase commutating choke (line reactor) for converter front-ends. It sits between the AC supply and the drive input, limiting current rise during commutation and smoothing the voltage waveform. The 1.2 mH inductance at 22.5 A rated current (25 A maximum, 31 A peak) is sized for a 3-phase 500 V AC line at 50 Hz. The 4% relative inductive voltage drop at rated current tells you the impedance it adds to the circuit — enough to protect the converter diodes without dropping excessive line voltage under load. This is a mature, cataloged part (lifecycle stage: mature) with UL/CSA recognition per EN 61558-2-20, so it's accepted in North American and European panels.
Mounting and connection
IP00 protection class means no enclosure — mount this inside a panel or cabinet with adequate clearance. The screw-type terminals on the main circuit accept standard power wiring. Dimensions are 0.178 m wide, 0.153 m high, 0.105 m deep, so plan for a footprint roughly 180 mm × 155 mm on the backplate. Thermal class B (130 °C) insulation per IEC 60085, with 47 W coil loss and 8.2 W iron-core loss at rated conditions; factor that heat into your cabinet ventilation.