The Siemens 4EP3701-5DS00 is a 3-phase commutating choke (line reactor) designed for converter front-ends. It's rated for 400V AC at 50 Hz, with a maximum AC current of 25A and a rated inductance of 0.89 mH. The relative inductive voltage drop at rated current, voltage, and frequency is 4% — a standard figure for this class of choke, meaning it provides enough impedance to limit di/dt and smooth commutation notches without excessive voltage drop under load.
Sizing and thermal class
The choke carries a rated operational AC current of 22.5 A and a DC rated current of 30.6 A, so it's sized for a converter DC bus pulling up to that DC level. The thermal class is B per IEC 60085, with a 40°C ambient rating. Copper losses (coil) are 53 W, iron losses 9 W — total 62 W dissipated in free air. The IP00 enclosure means it's an open-frame component for cabinet mounting; no washdown or dust protection, so panel ventilation must handle the heat.
Mounting and connections
Dimensions are 0.178 m wide, 0.153 m high, 0.105 m deep — a compact footprint for a 25 A three-phase choke. Main circuit connections are screw-type terminals, which simplifies panel wiring with ring or fork lugs. No DIN-rail clip; it's a foot-mount chassis unit that bolts to the panel backplate.