Siemens 3RW44 User Manual

Installation, connection and feeder configuration
4.2 Design of the feeder
3RW44 soft starters
34 Manual, 03/2017, NEB535219502000/RS-AB/008
Figure 4-3 Block diagram of 3RW44 soft starters in standard circuits
NOTICE
Error message due to delayed switching of the contactor
If a main or line contactor is connected between the soft starter and the motor or in the
return line between the motor and the soft starter, steps must be taken to ensure that this
contactor is connected within 100 ms of activation of the start command for the 3RW44.
If the contactor is not connected within 100 ms of activation of the start command for the
3RW44, the soft starter no longer recognizes the current circuit variant (standard circuit or
inside-delta circuit). A "Missing load phase 1-3" error message is generated.

Siemens 3RW44 Specifications

General

Temperature range	-25°C to +60°C
Degree of protection	IP20
Product category	Soft starter
Product designation	3RW44
Type of voltage	AC
Protection class IP	IP20
Standards	IEC 60947-4-2
Overload class	Class 10, 20