What this output reactor does for a drive line
The Siemens SIDAC 4EU4351-0EA00-0A is a 3-phase output reactor — also called an output choke — placed between a variable-frequency drive and the motor to limit the rate of voltage rise (dV/dt) and reduce capacitive coupling currents in long cable runs. The 0.0002 H inductance (0.2 mH) provides enough impedance to smooth the drive's output waveform without excessive voltage drop at the motor terminals.
Thermal and mounting constraints
This reactor dissipates 970 W total power loss — 670 W in the coil and 300 W in the iron core — at a rated ambient temperature of 40 °C. Thermal class H insulation per IEC 60085 allows a 180 °C hot-spot temperature, which gives headroom for overloads in a 40 °C ambient but still requires forced airflow in a crowded panel.
Physical fit in the panel
The reactor measures 0.46 m wide by 0.43 m high by 0.26 m deep. It is a floor-mount or back-panel-mount component; verify the gland plate and cable entry positions against the flat-type terminal locations before laying out the cabinet.