Device for the control of a smooth starting or ending of a three phase current motor, so-called soft starter

Arrangement for the control of a soft start or a soft finish of a three phase current motor (1) (so-called soft starter), which arrangement is pre-connected for the starting of heavy mechanical, electrical, or hydraulic drives, wherein individual device groups of a power block (4) with thyristors (16), a power electronic (5) as well as with contactor are together installed in a switch cabinet (2), wherein at least one switch cell (3) is formed in the switch cabinet (2), which switch cell (3) comprises at least the three phase power block (4), the associated power electronic (5) as well as the required contactors, and in a frame (7) with surrounding switch cell walls (9b) and an attachment of support insulators (28) running in the mounting direction (26), wherein the support insulators (28) as a unit are furnished easily demountable from the front and in reverse incorporatable and without attachment at a rear or side wall (8) of the switch cabinet (2) and that in contrast a separating switch (9) attached at the switch cabinet wall (2) and connectable upon insertion or disengageable upon removal with a collection rail connection (10) by way of a pluggable contact coupling (10a).