Commutating Choke for Converter Duty
It carries a rated current of 22.5 A at 400 V AC, 50 Hz, with a maximum continuous current of 25 A. The inductance is 1.1 mH, and the relative inductive voltage drop is 4% at the rated operating point. The thermal class is B (130 °C rise) per IEC 60085, with a rated ambient temperature of 40 °C. Total power loss splits between the coil (52 W) and the iron core (10 W), which should be factored into the cabinet thermal budget.
Sizing and Application Context
Mount this choke in the AC line between the supply and the converter's rectifier input. The 4% voltage drop at rated current is the design target for limiting harmonic distortion and reducing di/dt stress on the converter's input diodes. For a 400 V three-phase system, the 22.5 A rating typically matches a converter driving a motor load in the 11–15 kW range, depending on the drive's input current profile. The physical footprint is 0.178 m wide × 0.153 m high × 0.105 m deep. Panel layout must allow clearance around the IP00 core and terminals for airflow and tool access to the screw connections. At DC rated value, the choke handles 30.6 A — this is the current it can sustain if the converter operates in a regenerative or DC-link configuration, though the primary rating is the AC line current.