The Siemens 4EP3910-7AS30 is a Netzdrossel — a three-phase AC mains choke (line reactor) rated for 50 A maximum continuous current, 45 A nominal, at 500 V operating voltage. It presents 0.42 mH inductance per phase and a 3% relative inductive voltage drop at rated conditions. The open-frame IP00 design means it mounts inside a panel or enclosure; there's no housing for touch protection, so panel builders must account for clearance and separation from live parts. Screw-type terminals on the main circuit make for straightforward field wiring.
What the ratings mean for fit
The 50 A maximum and 45 A rated current define the thermal envelope for continuous motor-drive or converter input duty. The 3% voltage drop at rated current is the impedance the choke presents to smooth line transients and limit harmonic distortion.
Lifecycle and sourcing reality
The lifecycle stage is marked as mature, meaning this is an established, stable product — not newly introduced, not flagged for phase-out. It remains in the current Siemens SENTRON line reactor portfolio. For a BOM freeze or a line-down replacement, this part is sourced to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Panel integration notes
The footprint is 0.219 m wide by 0.179 m tall by 0.123 m deep. The IP00 rating means the winding and core are exposed — the enclosure must provide touch protection. Screw terminals accept conductors for the 50 A circuit.