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Three-phase du/dt chokes, 3RTU type

Three-phase du/dt chokes, 3RTU type

Purpose and design

Three-phase du/dt chokes are used in drive systems powered and regulated by inverters. The du/dt chokes installed at the inverter output limit the steepness of the rise of the du/dt pulses of the motor supply voltage. This protects the insulation of the power cable and the motor. Du/Dt chokes can be made in IP23 rated enclosures or covers. In case of a need for installation of chokes in enclosures with a higher protection class should be consulted with the manufacturer.

Upon agreement, we can manufacture a non- standard device with the required technical parameters.
The manufacturer reserves the right to make changes to the parameters due to technical product developments.

Technical Standards EN/IEC 60076-6; EN/IEC 61558-2-20
Mains voltage 400 V (max. +10%)
Frequency 50 Hz
Voltage drop at choke > 4 % kHz
Overload capacity 110% 60min / 150% 60s Voltage test 3kV / 50Hz / 60s
Max. ambient temperature from -250C to +400C
Insulation class F (1550C)
Environment/climate class C1/E0 – land based, C2/E1 – mining and offshore
Protection classIP00 or IP23
Cooling AN (natural air)