Semiconductor soft starter 3RW3 8.3.3.3 Combining the contactor 3RT with the thermal overload relay 3RU1 and the soft starter 3RW3 Size of the overload relay The chosen size of the overload relay should be so large that the calculated current value can still just be adjusted. The next smallest overload relay must be used if the resulting current values are less than in the case of the specified overload relay. Important It is not permitted to install the thermal overload relay under the "contactor - connecting lead - soft starter" combination. The overload relay must be installed in the branch before the contactor - connecting lead - soft starter combination.
The specified compensation fac- tors apply only to this permissible assembly sequence DIN rail1: Combination of contactor 3RT1 and thermal overload relay 3RU1 3RT DIN rail 2: Soft starter 3RW3 Connecting lead 3RW 3RU1 Fig. 8-13: Combination 3RT+3RU1+3RW3 Minimum clearances A minimum clearance between the contactor/overload relay combination and the soft starter and a minimum length of the connecting leads are nec- essary for thermal reasons. The following table lists the minimum clearances and minimum length of the connecting cable for the individual sizes: Tabelle 8-8: Assembly specifications 3RW3, minimum clearances/lengths Rev.
08/99 8-23 3RT 3RU1 3RW Size Minimum clearance between DIN rail 1 and DIN rail 2 (center - center) in mm Minimum length of the connecting lead in mm S00 160 100 S0 200 150 S2 240 200 S3 300 250