The Universal electronic step-relay TE7613.3 and TE7613.5 are suitable just for resistive loads, like incandescent and halogen lamps. The presence of an occasionaly noise is caused by the filter, imposed by the CE certification. Moreover, the presence of this filter requires a minimum and maximum load power. the push buttons have to be all to phase.
The Universal electronic step-relay TE7614.5 is suitable for any load and the push buttons have to be all to neutral.