SIEMENS
6/7
Siemens IC 10 · 2017
SIRIUS 3RW Soft Starters
General data
6
Boundary conditions
The motor ratings listed in the Selection and Ordering Data are
rough guide values. The soft starter should always be designed
on the basis of the required rated operational current of the
motor. 3RW soft starters are designed for easy starting
conditions.
For selection of soft starters in the Selection and ordering data,
a current load of 300% was defined for all 3RW soft starters as
the boundary condition for normal starting (CLASS 10). For
3RW30, a maximum number of 20 starts per hour for a maximum
of 3 s starting time was defined as the boundary condition; for
3RW40 and 3RW44, a maximum number of 5 starts per hour for
a maximum starting time of 10 s was defined.
In case of additional requirements, it may be necessary to
choose a larger device. In some cases, however, the safety
margins taken into account in the selection also permit the listed
units to be used in boundary conditions which are slightly more
demanding.
We generally recommend the Simulation Tool for Soft Starters
(STS) for selection of 3RW soft starters
see page 14/5
.
Motor rating data in kW and hp is based on IEC 60947-4-1.
Article No. scheme
Note:
The Article No. scheme shows an overview of product versions
for better understanding of the logic behind the article numbers.
For your orders please use the article numbers quoted in the
selection and ordering data.
Product versions
Article number
Device type
Soft starters
3RW30
@
@
–
@
@
@
@
@
–
@
@
@
@
For standard applications
3RW40
@
@
–
@
@
@
@
@
–
@
@
@
@
For standard applications
3RW44
@
@
–
@
@
@
@
@
–
@
@
@
@
For High Feature applications
Size
e.g. 2 = S0 (for 3RW30/40)
@
Rated operational current
I
e
e.g. 6 = 25 A (for 3RW30/40)
@
Connection type
e.g. 1 = screw terminal
(for 3RW30)
@
Soft starter functionality
e.g. BB = with integrated bypass,
two-phase controlled
(for 3RW)
@
@
Rated control supply
voltage
U
s
24 V AC/DC
0
Up to size S3 for 3RW30/40
110 … 230 V AC/DC
1
Up to size S3 for 3RW30/40
115 V AC
3
For 3RW40/44
230 V AC
4
For 3RW40/44
24 ... 230 V AC/DC
5
For 3RW3003
Rated operational voltage
U
e
e.g. 4 = 200 ... 480 V
(for 3RW30/40)
@
Special versions
@
@
@
@
Example
3RW40
2
6
–
1
B
B
1
4
© Siemens AG 2016