Wiring for use with RC suppressor and varistor

The varistor can effectively suppress the cut-off overvoltage. There are two ways of connecting the varistor: star shape and delta
shape. For motors with star-shaped stator windings, the varistor should be connected in delta. The varistor can
be selected according to the following empirical formula:
    UlmA≥(2-2.5)Ug
    Ie≥SkA
where UlmA-nominal voltage of the varistor, v,
    䉉——working voltage. V;
    f. ——The flow capacity of the varistor . kA.