Mains Choke for Variable Frequency Drives
The Siemens 4EP3800-8US00 is a three-phase mains choke (line reactor) designed for installation upstream of a variable frequency drive (VFD). Its job is to smooth the input current, reduce harmonic distortion, and limit inrush current spikes that can trip upstream breakers or stress the drive's DC bus capacitors. Rated for 500 V AC at 50 Hz, it carries a maximum continuous current of 22.4 A and a rated current of 20.16 A — the rated figure is the one to size against your drive's input current draw. The 1.6 mH inductance and 4 % relative inductive voltage drop tell you how much filtering it provides: at rated load, the choke drops 4 % of line voltage, which is typical for a 4 % impedance line reactor used in drive input filtering. Total power loss splits between the coil (38 W) and the iron core (13 W), summing to 51 W at rated conditions. Thermal class B (130 °C rise) per IEC 60085 means the winding insulation handles the heat without derating in a 40 °C ambient — standard for enclosed panel mounting where airflow is limited.
Sourcing & Lifecycle
The 4EP3800-8US00 is UL and CSA recognized per the description, which simplifies panel acceptance in North American installations. The IP00 enclosure means it is an open-frame component intended for mounting inside a cabinet with a higher IP-rated door — not for standalone outdoor or washdown use.
Panel Integration
Dimensions are 0.178 m wide by 0.153 m tall by 0.12 m deep. The screw-type terminals for the main current circuit accept standard power wiring; plan for a minimum of 0.12 m clearance behind the panel door for the depth. Mounting is via the frame's own brackets — no DIN rail clip, so allocate a sub-panel or chassis-mount location.