The ideal soft starter for Every Application
SIRIUS 3RW soft starters are a cost-effective alternative to using direct or wye-delta starters for starting three-phase motors. They avoid undesirable side effects such as mechanical bumps in the machine and mechanics or voltage drops in the main supply. The soft start in control cabinets can be implemented in almost any application in a simple and practical way with our complete soft starter range.
Advantages at a Glance
Soft start and soft stop
Smooth starting, without steps
Reduced current peaks
Avoidance of line voltage fluctuations during start-up
Reduced load on the power supply system
Reduced mechanical load in the drive
Considerable space savings and reduced wiring compared to other starters
Ease of handling
Perfectly matched with SIRIUS devices for the control cabinet
Thanks to its outstanding functions, the SIRIUS 3RW44 handles difficult start-up and deceleration processes in a simple and, above all, gentle manner. With its innovative torque control system, it can be used for drives with a power output up to 710 kW at 400 V – respectively 950 hp at 460 V – in an inline circuit or up to 1200 kW at 400 V – respectively 1700 hp at 460 V – in an inside-delta circuit. Designed for simple handling, the functions are exceptionally easy to use. SIRIUS 3RW soft starters can be used in all sectors worldwide where soft starting without speed control is required.
Optimum acceleration due to torque control
Simple and fast commissioning thanks to user-friendly display
Savings in size and costs due to optional inside-delta circuit
Simple integration in higher-level control units via PROFIBUS
SIRIUS soft starters now speak PROFINET:
Line and ring bus topology thanks to an integrated switch
Media redundancy through MRP- Thanks to the redundant design, plant and machine availability are considerably enhanced. This is because the failure of individual devices no longer influences communication.
Interval function and measured values for energy management via PROFIenergy
Module replacement without PC
Comprehensive diagnostics and error alarms
OPC UA server function for open communication with visualization and control systems
Belt slip on heater blowers or a sudden buildup of water pressure in washing installations are only two of the many problems that can occur when motors generate too much power on starting. With the SIRIUS 3RW30 from 1.5 kW to 55 kW (at 400 V) you can easily avoid such problems. And the best of it all is: It is also possible to switch straight from direct to soft start because SIRIUS 3RW30 is the only soft starter in the world that offers identical sizes in a family of devices.
Advantages at a glance
Uniform connection system with screw or spring- loaded terminals
Space-saving clear cabinet design thanks to its small and compact construction
Reduction of current peaks
Relief of the power supply network
Reduction of the mechanical load in the drive
Simple and fast startup and maintenance
SIRIUS 3RW40 is the star among our standard soft starters. Thanks to its innovative control method, it is not just the only 2-phase-controlled soft starter in the world for use in the power range up to 250 kW (at 400V) – respectively 300 hp (at 460V) – because of its especially compact design, it ensures a space-saving, clear layout in the control cabinet. It is therefore more than a mere functionally expanded addition to our 2-phase-controlled series of SIRIUS 3RW30/31 soft starters. The new 3RW40 soft starters in the lower power range from 5.5 - 55 kW (with 400 V) in sizes S0 to S3 expand the performance spectrum of the 3RW40 soft starters. They represent the compact and price-attractive alternative to start-delta starters.
Uniform connecting system with screw or spring-loaded terminals
Space-saving, clear layout in the control cabinet thanks to small, compact design
Integrated bridging (bypass)
Inherent protection and protection against motor overload without additional wiring
Optional thermistor motor protection
Avoidance of peak inrush current thanks to adjustable current limitation
Simple and fast commissioning
Certified according to ATEX standards with sizes S0 - S12
Energy-efficient SIRIUS industrial controls help to minimize consumption and systematically increase efficiency. With our SIRIUS 3RW Soft Starters, you benefit from comprehensive advantages in terms of energy efficient industrial controls
Transmission of current values
Energy management: energy data collected at a higher level
Reduction of load on the power system by avoidance of current peaks
Less heat in the cabinet: - lower power loss than with use of frequency converters- resulting in less cooling and compacter design
All sizes equipped with a bypass contactor, resulting in lower power loss than conventional soft starters
More information about the topic of energy efficiency and PROFIenergy at Siemens:
With the new Simulation Tool for Soft Starters (STS) we are providing a convenient way of designing soft starters using a simple, quick and easy-to-use interface. Entering the motor and load data will simulate the application and prompt suggestions for suitable soft starters.
Quick, easy and user-friendly interface
Complete and up-to-date Siemens motor database, including IE3 motors
Update capable (for new soft starters, motors or functions)
Quick simulation with only a few basic inputs
Immediate display of starting curves and diagrams with limit values
Table view of possible soft starters for the given application
The Soft Starter ES software supports the parameterization and evaluation of SIRIUS 3RW44 - our soft starter solution for high-feature applications.
The PCS 7 block library facilitates the easy and comfortable integration of SIRIUS 3RW44 soft starters in the SIMATIC PCS 7 process control system.
SIRIUS - Switching
SIRIUS Soft Starters: Protection of motors and mechanics, reduced load on the mains
SIRIUS Modular System
Highly flexible system-based switching, protecting and starting.