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Why is it required to use surge suppressor modules with our TeSys contactors.

The Surge device fitted on TeSys contactor coils is designed to limit the surge voltage generated by coil on opening sequence.
If surge device is not used then it may generate surge of some kV on the coil supply. 

Please refer the below attached file for the technical characteristics for the different type of Surge suppressor modules used for our TeSys D contactors.

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