What this reactor does in the line
The Siemens SIDAC 4EP3700-7MS00 is a 3-phase filter reactor rated for 8.96 A continuous at 400 V AC, 50 Hz. The 7% relative throttling factor means it introduces 7% impedance relative to the load — a common value for mitigating harmonic distortion from variable-frequency drives or reducing inrush current on capacitor banks. The 0.0062 H inductance and 189 Hz resonant frequency define the filter's tuning point; at 189 Hz the reactor and its associated capacitor bank present a low-impedance path, shunting that frequency component to ground.
Footprint is 0.178 m wide by 0.153 m tall by 0.105 m deep. Thermal class B insulation per IEC 60085 means the winding hot-spot temperature is rated for 130 °C continuous — adequate for 40 °C ambient with natural convection cooling. The 3-phase design uses a three-limb core; verify the panel depth accommodates the 0.105 m projection plus clearance for the terminal connections and air flow.