3RW30 for standard applications

■Overview
Various versions of the SIRUS 3RW30 soft starters are
available:
• Standard version for fixed frequency three-phase motors,
sizes S00, S0, S2 and S3
• Version for fixed-speed three-phase motors in a 22.5 mm
enclosure
• Special-purpose version 3RW31 for Dahlander motors only in
size S0
• Version for soft starting single-phase motors of sizes S0, S2
and S3.

SIRIUS 3RW30 for three-phase motors
Soft starters rated up to 55 kW (at 400 V) for standard applications
in three-phase networks. Extremely small sizes, low power
losses and simple commissioning are just a few of the many advantages
of this soft starter. The special feature of the 3RW31
series is that it allows independent definition of two separate
acceleration ramps (Dahlander motors).

SIRIUS 3RW30 for single-phase motors
The additional version for standard applications in single-phase
networks. Its voltage edge function reduces the motor's inrush
current and effectively lowers the torque at the point of starting
up. The load and the supplying network are thus protected.

■Application
The SIRIUS 3RW30/31 solid-state soft starters are suitable for
soft starting and stopping of three-phase asynchronous machines.
Due to two-phase control, the current is kept at minimum values
in all three phases throughout the entire starting time. Due to
continuous voltage influencing, current and torque peaks, which
are unavoidable in the case of wye-delta starters, for
instance, do not occur.

Application areas
• Fans
• Pumps
• Building/construction machines
• Presses
• Escalators
• Transport systems
• Air conditioning systems
• Ventilators
• Assembly lines
• Compressors and coolers
• Operating mechanisms