Siemens SIRIUS 3RW30 - Page 75

Installation / mounting
9.4 Soft starter assembly with type of coordination 2
SIRIUS 3RW30 / 3RW40
Manual, 10/2018, NEB535199502000/RS-AB/005
75
Note
Minimum and maximum configuration of the semiconductor fuses
The fuses for the minimum and maximum configurat
ion are specified in chapter Technical
data
(Page 127).
Minimum configuration: The fuse is optimized for the thyristor's I²t value.
If the thyrist
or is cold (ambient temperature) and the startup process lasts a maximum of 20
s at 3.5 times the rated current of the device, the fuse does not trip.
Maximum configuration: The maximum current permitted for the thyristor can flow without the
fuse tripping
.
The maximum configuration is recommended for heavy
-duty starting.
NOTICE
Risk of property damage
Type of coordination 1 in accordance with IEC 60947-4-1:
The device is defective following a short-circuit failure and therefore unsuitable for further
use (personnel and equipment must not be put at risk).
Type of coordination 2 in accordance with IEC 60947-4-1:
The device is suitable for further use following a short-circuit failure (personnel and
equipment must not be put at risk).
The type of coordination only refers to soft starters in conjunction with the stipulated
protective device (motor starter protector / fuse), not to additional components in the feeder.