Soft Starters In Inside-Delta Circuits - Siemens 3RW44 Manual

4.2.3

Soft starters in inside-delta circuits

Requirements
A motor whose windings can be connected in a delta circuit where a line voltage prevails.
Example
Line voltage:
Rated motor current:
Current via soft starter in inside-delta circuit:
Selected soft starter in inside-delta circuit:
Figure 4-4
The SIRIUS 3RW44 soft starter can be dimensioned to match the current flowing in the
motor section (58 % of the conductor current) by connecting it to the delta winding of the
motor. This requires at least 6 motor lines.
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
Nameplate of a 22 kW motor
Installation, connection and feeder configuration
400 V
40.5 A
approx. 24 A
3RW44 22
4.2 Design of the feeder
35