3RW40 for standard applications

■Overview
SIRIUS 3RW40 soft starters have all the same advantages as the
3RW30/31 soft starters. At the same time they come with additional
functions, e.g. solid-state motor overload and intrinsic device
protection and adjustable current limiting, as well as a twophase
control method (Polarity Balancing) that is unique in this
rating range.

SIRIUS 3RW40 soft starters are part of the SIRIUS modular system.
This results in advantages such as identical sizes and a uniform
connection system. Thanks to their particularly compact
design, SIRIUS 3RW40 soft starters are only half as big as comparable
wye-delta starters. Hence they can be mounted in minimum
space in the control cabinet. Configuring and installing are
carried out quickly and easily thanks to the 3-wire connection.

SIRIUS 3RW40 for three-phase motors
Soft starters rated up to 250 kW (at 400 V) for standard applications
in three-phase networks. Extremely small sizes, low power
losses and simple commissioning are just three of the many advantages
of the SIRIUS 3RW40 soft starters.

■Application
The SIRIUS 3RW40 solid-state soft starters are suitable for soft
starting and stopping of three-phase asynchronous motors.
Due to two-phase control, the current is kept at minimum values
in all three phases throughout the entire starting time and disturbing
direct current components are eliminated in addition.
This not only enables the two-phase starting of motors up to
250 kW (at 400 V) but also avoids the current and torque peaks
which occur e.g. with wye-delta starters.
Application areas
• Fans
•Pumps
•Building/construction machines
• Presses
• Escalators
• Transport systems
•Air conditioning systems
•Ventilators
•Assembly lines
•Compressors and coolers
•Operating mechanisms