The Siemens 4EP3600-2US00 is a three-phase mains choke — a line reactor — designed to sit between the supply and a variable-frequency drive (Netzdrossel f. FU). It smooths out incoming line notches, limits harmonic current, and protects the drive's DC bus from transient spikes that would otherwise knock out the rectifier. Rated for 500 V AC, 50 Hz, with a maximum continuous current of 16 A and a rated current of 14.4 A, it handles the typical front-end filtering for a 5–7.5 kW motor drive on a 400 V class system. The 1.2 mH inductance and 2% relative voltage drop are sized to keep the drive's DC bus voltage stable without dropping too much across the choke itself.
The 16 A maximum current (Ithmax) is the thermal limit in free air — the choke can carry that continuously without exceeding the Class B temperature rise (thermal class B per IEC 60085). The 14.4 A rated current (ILN) is the design point for the 2% voltage drop at nominal voltage and frequency. If your drive's continuous input current exceeds 14.4 A, the voltage drop across the choke climbs above 2%, and the drive bus voltage sags more than the controller expects. The 49.6 W coil loss and 17 W iron-core loss add up to about 67 W of heat dumped into the enclosure — factor that into your panel's thermal budget. IP00 means it's an open-frame component: no finger protection, no drip shield. It mounts inside a clean, dry cabinet, not out on the plant floor near washdown zones.
Integration notes
At 148 mm wide, 139 mm tall, and 78 mm deep, it's a compact block that fits on a standard mounting plate or DIN-rail bracket (not included). The screw terminals accept wiring up to the cross-section needed for 16 A — typically 2.5–4 mm². Because it's IP00, keep at least the minimum air clearance to grounded metal per IEC 60947-1; don't stack it tight against the drive's heatsink. The UL/CSA recognition (marked on the unit per EN 61558-2-20) means it passes inspection for North American panels without a separate component evaluation.