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siemens1119SPS hall 11, booth 100

With the new soft starters "Sirius 3RW55 Failsafe" and "Sirius 3RW50" expands Siemens Smart Infrastructure portfolio for soft starting engines. The Sirius 3RW55 Failsafe are the first soft starters with integrated Safe Torque Off (STO) function. The devices of the Sirius 3RW50 are compact and have a minimal power loss.

The normative safety function for electric drive systems of the Sirius 3RW55 Failsafe ensures that no torque-forming energy can be exerted when switching off motors. It thus prevents unwanted caster. Switch cabinet manufacturers no longer have to install the function using separate individual components, thus saving wiring and maintenance costs as well as space in the control cabinet. In addition, the switching time of the integrated solution is significantly shorter than with conventional, electromechanical components.

The Sirius 3RW55 Failsafe are suitable for starting and stopping operations on high-performance motors with a rated power of 5,5 to 560 kW with 400 V. The integrated Human Machine Interface (HMI) makes it easy to control all switching operations in a user-friendly manner. Optional communication modules enable needs-based functional enhancements.

The Sirius 3RW50 cover a power range from 75 to 315 kW at 400 V and are designed for simple standard applications. Optional communication modules provide additional functions. Thanks to the integrated soft-torque function, current peaks during startup are avoided and the mechanical load when starting and stopping motors is reduced. This makes the soft starters ideal for switching on pumps by preventing pressure spikes in the piping system and thus damage due to water hammer. They are certified to ATEX and IECEx.


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