3RW3 semiconductor motor control unit
SIRIUS System Manual
8-26
GWA 4NEB 430 0999-02b
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 + connect-
ing lead + 3RW3
Figure 8-12: 3RT+3RB10+3RW3 combination
Minimum clearance
For thermal reasons, a minimum clearance is necessary between the con-
tactor/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:
Table 8-11: 3RT + 3RB10 + 3RW3 installation guidelines, minimum clearances/minimum lengths
3RT
3RB10
Connecting
lead
3RW
Rail 1:
Combination of a 3RT1 contactor and
a 3RB10 electronic overload relay
Rail 2:
3RW30/31 soft starter
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
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