8 3RW3 semiconductor motor control unit (soft starter) - Siemens ...

3RW3 semiconductor motor control unit
8.3.3.4 Combining the 3RT contactor with the 3RB10 electronic overload relay and 3RW3 soft
starter
The contactor, electronic overload relay, and soft starter can be connected in
two ways:
• Combining a 3RT1 contactor with an attached 3 RB10 electronic overload
relay, a connecting lead, and a 3RW30/31 soft starter
• Combining a 3RT1 contactor with a connecting lead and a combination of
a 3RW30/01 soft starter with an attached 3RB10 electronic overload relay
3RT + 3RB10 + connecting
lead + 3RW3
Rail 1:
Combination of a 3RT1 contactor and
a 3RB10 electronic overload relay
3RT
3RB10
Rail 2:
3RW30/31 soft starter
Fig. 8-13: 3RT+3RB10+3RW3 combination
3RW
Connecting
lead
Minimum clearance
For thermal reasons, a minimum clearance is necessary between the contactor/overload
relay combination and the soft starter, as is a minimum
length of the connecting leads.
The following table specifies the minimum clearances and minimum lengths
of the connecting leads for the various frame sizes:
Frame size
Minimum clearance between
rail 1 and rail 2
(center to center) in mm
Minimum length of the
connecting lead
in mm
S00 160 100
S0 200 150
S2 240 200
S3 300 250
Table 8-11: 3RT + 3RB10 + 3RW3 installation guidelines, minimum clearances/minimum lengths
SIRIUS System Manual
8-26 GWA 4NEB 430 0999-02c