The Siemens 4EP4002-0AP00 is a 3-phase commutating choke (also called a line reactor or converter choke) designed to sit between a converter drive and the AC mains. Its job is to limit current rise rates, reduce harmonic distortion, and protect the converter's input rectifier from line notching and voltage spikes. Rated for 72 A continuous at 400 V AC, 50 Hz, with a maximum current of 80 A and an inductance of 0.31 mH, it handles the steady-state motor load and the peak inrush events a curing press or conveyor line throws at it.
The 80 A maximum is the overload capability.
Mechanical fit and connections
The choke measures 0.219 m wide, 0.179 m tall, and 0.143 m deep. The main circuit terminates on flat-type connectors. Protection is IP20.
The choke is designed to EN 61558-2-20, the safety standard for chokes used in converter applications. Thermal class B (130°C) per IEC 60085 sets the winding insulation limit. The 400 V AC, 50 Hz rating is standard across European 3-phase networks; the same unit works on 60 Hz lines at the same voltage, though the inductive drop scales with frequency.