Sirius 3RW30 soft starters offered in four frame sizes

According to Siemens, the Sirius 3RW30 soft starter improves the startup 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, thereby helping to reduce maintenance overheads and expensive current peaks.

Users can easily set the startup time and the starting voltage using two potentiometers on the device. In the 45mm frame size, the 3RW30 takes the place of a star-delta switch and saves up to 70 per cent 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.