Siemens SIRIUS 3RW40 - Calculating the Switching Frequency (Example)

Configuration
12.7 Calculating the permissible switching frequency
SIRIUS 3RW30 / 3RW40
98 Manual, 10/2018, NEB535199502000/RS-AB/005
Article No.
a (mm)
a (in)
b (mm)
b (in)
c (mm)
c (in)
Clearances from other devices
3RW301./3RW302.
15
0.59
60
2.36
40
1.56
3RW303./3RW304 30 1.18 60 2.36 40 1.56
3RW402.
15
0.59
60
2.36
40
1.56
3RW403./3RW404.
30
1.18
60
2.36
40
1.56
3RW405./3RW407. 5 0.2 100 4 75 3
12.7.2
Calculating the switching frequency (example)
Problem
The maximum permissible switching frequency of a 5.5 kW (12.5 A) 3RW4024 soft starter
must be determined. The requirements are side-by-side assembly and vertical mounting. A
run-up time of approx. 3 s at an ambient temperature of 40 °C is specified as a
supplementary condition (e.g. a pump motor with CLASS 10 starting). The soft starter must
be connected to a 3RV2021 motor starter protector by means of cables. (Clearance between
3RV and 3RW ≥ 40 mm)