Common mode power chokes

Common mode power chokes are based on high permeability ferrite toroids with two symmetrical windings. The operating current flows through them in such a way that the magnetics fields cancel each other out. The operating current is only affected by the low stray inductance of the windings. If the currents in the windigs are different, because of asymmetric interference, a high inductance works on the differential current.

These chokes are used mainly for RFI suppression of power electronic instruments, appliances and machines. Moreover these highly symmetrical chokes can be used as transformers as well as for potential separation.

Our standard offer consists of single phase chokes PMEC 105/SV3, 106/H, 106/Hn, 106/Vn and 106/SV4 series.



Design, dimensions and technical data
Climatic category 40/125/21
Nominal voltage 250 V, 50 Hz
Testing voltage (winding - winding) 1500 V, 50 Hz, 2 sec.
Inductance tolerance 1) - 30 %, + 40 %
Overtemperature of the windings < 55 °C
Maximum admissible temperature of the windings 115 °C
1) Measured at 10 kHz, 50 mV and 25 °C.
The nominal current is applicable up to ambient temperature of 60 °C. Above this temperature descends the acceptable current linear to zero at 125 °C.
All measurements comply with the requirements of EN 60938-1 (VDE 0565 part 2).

Insertion loss of common mode power chokes

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