The Siemens 4EP3600-3DS00 is a 3-phase commutating choke for line-commutated converters — the inductive element that limits di/dt and smooths the DC link ripple in a 400 V AC drive or rectifier circuit. Rated 25.2 A continuous (28 A max) with 0.5 mH inductance and a 2 % relative inductive voltage drop at rated current, it is sized for the input side of a 3-phase converter feeding a motor drive or DC bus. The IP00 open-frame construction means it mounts inside a panel or enclosure that provides its own touch protection — this is not a stand-alone outdoor part.
The 25.2 A rated current (28 A maximum) at 400 V AC, 50 Hz, is the thermal continuous rating at 40 °C ambient with thermal class B insulation (130 °C hot-spot). That 25.2 A figure governs the converter input current it can handle without saturating or overheating — size the upstream line reactor or transformer for that continuous load, not the peak. The 0.5 mH inductance and 2 % relative inductive drop are matched to the commutation requirements of a 6-pulse or 12-pulse thyristor bridge; a choke with significantly different inductance changes the overlap angle and may increase notching or reduce the available DC voltage. Power loss splits between 39 W in the coil and 8.7 W in the iron core at rated load — total 47.7 W of heat to vent inside the panel.
Termination and integration notes
The 0.078 m depth, 0.148 m width, and 0.139 m height define the mounting footprint; allow clearance for air flow and terminal access. IP00 means no integral finger protection — the panel builder must provide the enclosure and any required touch-safe shrouding. Thermal class B insulation (130 °C) gives headroom above the 40 °C ambient rating, but the 47.7 W total loss must be vented; do not bury the choke in a sealed compartment without forced air or a thermal calculation.