What this choke is and what it does
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.
What the ratings mean for your panel
The 72 A rated current is the continuous thermal rating at 40°C ambient with Class B insulation. The 80 A maximum is the overload capability. The 4% relative inductive voltage drop at rated current is typical for a 4% impedance reactor.
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.
Standards and compliance
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.