The Siemens 4EU5051-0AA10-0C is a mains choke (Netzdrossel) — a three-phase line reactor rated for 690 V AC at 680 A continuous, with an inductance of 0.00018 H and an 11.6% relative inductive voltage drop at rated current and frequency. It operates on 50 to 60 Hz mains, so it covers both standard industrial line frequencies without derating. The 11.6% voltage drop is the key sizing parameter: it defines how much the choke limits inrush current and harmonic distortion on the line side of a drive or converter.
At 0.518 m wide, 0.318 m deep, and 0.565 m tall, this is a large-frame choke — expect dedicated floor-mount or heavy sub-panel space, not a DIN rail clip. IP00 means no enclosure protection: the choke requires installation inside a cabinet that provides the environmental seal. The flat-connector main terminals are sized for bus-bar or large-lug cabling, not spring-cage terminations.
Thermal and lifecycle reality
Rated for 45 °C ambient with thermal class H insulation — the winding can handle a 180 °C hot-spot, which gives headroom in a warm cabinet but still demands the 2440 W coil loss and 795 W iron-core loss be ventilated out.
Sourcing and fit confirmation
The 680 A / 690 V rating pins the choke to large-drive applications. The 0.00018 H inductance and 11.6% voltage drop are the numbers to match against your drive manufacturer's recommended line reactor spec.