R911305855 is part of the HMF Motor Filters Series by Indramat Drives.
Specs
Connection: Inverter output Maximum Output Current: 150A at 4kHz Function: Lowering leakage current in motor wires Weight: 20kg Voltage: Pulse-shaped waveform Size: Compact Protection Rating: IP 10 as per IEC 60529 Switching Frequency: 4kHz Uses: Automated machinery, CNC machines, retrofitting Motor Protection Comparison: Better than load reactor Speed Limitation: Capable if short cables are used