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A NEW GENERATION OF SIRIUS SOFT STARTERS: Presenting advanced features in two new product families that save costs in a multitude of start-up applications

The Sirius 3RW40 and the Sirius 3RW44 multi-featured soft starters can be used in a wide variety of start-up applications from gently starting/stopping conveyor belts through to hydraulic pumps. The ne w additions extend and complement the modular Sirius range of fast- and easy-to-combine products that switch, protect and start motors and other loads.

Extremely compact, the Sirius 3RW40 is half the size of a comparable wye-delta starter, saving space in the control cabinet. A new control technique allows it to control two-phases in the power range up to 300HP/460V . Additionally, it uses a new Siemens patented control technique called “Polarity Balancing” to avoid DC current components in soft starters that control two phases.

The second new product, the Sirius 3RW44 , is designed for the most demanding motor starting applications and has an innovative closed-loop torque control allowing it to start drives up to a power rating of 950Hp/480V in a standard configuration. When starting and stopping motors it can ensure torque surges and current spikes are avoided, saving costs when dimensioning switchboards and when servicing and maintaining machinery. Start up is made simple using a keypad with a menu-driven graphical display. A new brake function allows for quicker stopping of freewheeling loads.

Both soft starter families have the full range of integrated protective functions: they have a bypass contact system which minimizes power loss preventing rising temperatures around the control gear; both have motor protection with adjustable overload tripping time. This latter feature makes an overload relay unnecessary and therefore saves space in the control cabinet and eliminates additional wiring costs in the load feeder. Both the 3RW40 and 3RW44 also have internal self protection and optional SITOR semiconductor protection fuses, which prevent thermal overloading of the thyristors or a short-circuit.

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