The Siemens 4EP4000-1DS00 is a commutating choke (line reactor) for converter applications, designed to smooth current ripple and limit di/dt on the DC link or input side of a variable-frequency drive or rectifier. It is a 3-phase, 400V AC rated choke with a rated current of 72A and a maximum current of 80A. The inductance is 0.35 mH, with a relative inductive voltage drop of 4% at rated conditions. This means it introduces a predictable impedance to limit harmonic currents and protect the converter's semiconductor devices from excessive switching stress.
Rated at 72A (80A max) on a 400V AC 3-phase system, this choke is sized for a drive or converter with a nominal output current in that range — typically a 37–45 kW motor at 400V. The 0.35 mH inductance and 4% voltage drop are chosen to keep the DC-link ripple within acceptable limits without excessive voltage drop under load. The 98A DC rated value indicates the choke can handle the DC-side current if used in a DC-link configuration, matching the peak current from a 3-phase bridge rectifier feeding a 72A AC input.
Thermal and environmental limits
Rated for 40°C ambient temperature with thermal class B insulation (130°C hot-spot) per IEC 60085. Total power loss splits into 71W in the coil and 33W in the iron core, so the choke dissipates about 104W at full load. The flat-type terminals accept busbar or cable lugs, typical for power connections in a drive cabinet.
Footprint is 0.219 m wide by 0.179 m tall, with a depth of 0.143 m. This is a panel-mount component — not DIN-rail — so it requires a mounting plate and clearance for the flat-type terminals and air flow. The 104W heat dissipation means spacing from other heat-sensitive components is necessary; forced ventilation is recommended if the panel ambient exceeds 40°C.