Siemens SIRIUS 3RW30 Manual page 34

Functions
5.3 Motor protection / intrinsic device protection (3RW40 only)
Figure
For further information, refer to the operating instructions, Order No. 3ZX1012-0RW40-1CA1
(http://support.automation.siemens.com/WW/view/de/22809303).
Danger of death or serious injury.
The 3RW40 is not suitable for installation in hazardous areas. The device is only allowed to
be installed in a control cabinet with the IP4x degree of protection. Appropriate measures
(e.g. encapsulation) must be taken if it is to be installed in a hazardous area.
Trip class (electronic overload protection)
The trip class (CLASS) specifies the maximum time within which a protective device must trip
from a cold state at 7.2 x the rated operational current (motor protection to IEC 60947). The
tripping characteristics represent this time as a function of the tripping current (refer to
chapter Motor protection tripping characteristics for 3RW40 (with symmetry) [Page 161]).
You can set different CLASS characteristics according to the startup class.
Note
The rated data of the soft starters refers to normal starting (CLASS 10). The starters may
need to be calculated with a size allowance for heavy-duty starting (> CLASS 10). You can
only set a rated motor current that is lower than the soft starter rated current (for the
permissible settings, refer to chapter Technical data [Page 121]).
Recovery time (motor overload protection)
A recovery time of 60 seconds, during which the motor cools down and cannot be restarted,
starts if the thermal motor model is tripped.
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5-6 3RW40 wiring fault with 3RV
WARNING
SIRIUS 3RW30 / 3RW40
Manual, 01/2010, 535 1995-02 DS01