Siemens Industry Automation is expanding its product range of Sirius soft starters with the compact 3RW30.
The devices in four frame sizes enable soft starting of motors in standard applications such as pumps, conveyor belts, or fans up to
55 kilowatts at 400 volts. The Sirius 3RW30 soft starter improves the start-up characteristics of motors with two-phase polarity balancing, and avoids mechanical loads, voltage fluctuations, and current peaks. This protects not only the drive system but also the power network and thus minimises maintenance overhead and expensive current peaks.
Users can easily set the start-up time and the starting voltage using two potentiometers on the device. In the 45-millimetre frame size, the 3RW30 takes the place of a star-delta switch and saves up to 70% of control cabinet space while delivering the same performance power. The device can be easily configured and installed using three motor leads and variable connections.
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