The Siemens 4EU2521-5DA00-0A is a commutating choke for converter drives — a 3-phase line reactor rated 380 V AC with a maximum continuous current of 175 A and a rated current of 158 A. This is the current-limiting element that sits between the AC supply and a variable-frequency drive or DC drive input — without it, the converter's switching transients can weld contactors and blow upstream fuses. The 175 A maximum governs the upstream MCCB or fuse sizing, not the motor full-load amps; the choke's own thermal capacity sets the floor.
Three-phase, 380 V AC, 50 Hz. The 0–50 Hz operating frequency range means it is designed for standard line frequency — not for the variable output of a VFD. At DC, the rated value is 214.4 A — this matters if the choke is used on the DC link of a drive, but the primary application is AC line side. Thermal class H per IEC 60085 means the insulation system withstands 180 °C hot-spot temperature — standard for converter-duty reactors that see harmonic heating. The total power loss splits between the coil (105 W) and the iron core (70 W); plan for 175 W of heat rejection inside the enclosure. IP00 means no ingress protection — this is an open-frame component for a clean, dry cabinet, not for outdoor or washdown duty.
Integration and deployment
Mounting dimensions: 0.225 m wide, 0.21 m tall, 0.16 m deep. This is a panel-mount component — no DIN rail clip. The flat-type terminals accept busbar or cable lug connections; plan for 0.2–0.5 m of clearance above and below for airflow and lug access. In a 380 V drive cabinet, this choke typically mounts between the input circuit breaker and the drive input terminals.