Specifications

SIRIUS Modular System
System overview
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Siemens LV 1 · 2007
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The new SIRIUS 3RW40 soft starters – for soft starting up to high ratings
Two new types of soft starter in compact SIRIUS design provide
the answer for the starting of three-phase asynchronous motors
with reduced strain on the load and the network. The new SIRIUS
3RW40 soft starter is used in demanding standard applications.
The SIRIUS 3RW44 soft starter is the right choice for high func-
tionality and for difficult starting operations.
For simple to demanding standard applications in which a wye-
delta starter has been used up to now, the SIRIUS 3RW40 soft
starter provides the best solution for starting applications with
zero torque surge. With a power range from 75 to 250 kW (at
400 V) the new SIRIUS 3RW40 soft starters supplement the ex-
isting, service-proven product segment of the 3RW30 soft start-
ers with 2-phase control. The use of 2-phase controlled soft
starters up to this high performance range is unique and was
made possible by a new control method which was specially de-
veloped by Siemens.
For motor starts with more exacting requirements, which up to
now had to be implemented with a frequency converter for ex-
ample, the SIRIUS 3RW44 soft starter provides the greatest
functionality and diagnostics with user-friendly operation. For in-
tegration in the process landscape the new 3RW44 high feature
soft starter can be retrofitted with an optional PROFIBUS DP
module. Thanks to its new torque control the SIRIUS 3RW44 soft
starter is a master of difficult starting and ramp-down operations
for operating mechanisms covering a performance range up to
710 kW at 400 V with an inline circuit (up to 1200 kW at 400 V
with an inside-delta circuit).
■ Benefits
The advantages and highlights at a glance
• Load feeders
Easy to implement up to 250 kW / 400 V from standard devices
• Modular design
Everything fits together and can be combined
• Variants and sizes
Economical and flexible thanks to seven compact sizes
• Accessories
Optimum variance with uniform accessories
• Construction
Space-saving design with small device width and
butt-mounting type of construction up to 60 °C
• Installation
Fast start-up, short setting-up times and simple wiring
• Communication
Connection to AS-interface and PROFIBUS DP possible
• Maintenance
Extremely long life, low maintenance and reliable
• Approvals
Global approvals and certifications such as IEC, UL, CSA,
CCC, shipbuilding
• Mounting
Permanently secure mounting, screwed or snap-fitted
• Spring-type terminals
Quick and secure connection, vibration-proof and
maintenance-free
• Service
Short delivery periods thanks to world-wide logistics network
• Environment
Environment-friendly production and materials,
recycling capability, low power loss
• Design
Clear-cut, ergonomic design
(winner of the iF Product Design Award)
© Siemens AG 2007