This document introduces the features and characteristics of SIRIUS soft starters 3RW30 and 3RW40, including optimal adjustment based on specific drive applications, minimum power loss through integrated bypass contacts, and space-saving compared to star-delta wiring. In addition, other highlights of 3RW40 are mentioned, such as integrated motor overload protection, optional thermistor protection, soft stop, and adjustable current limit function. The document also provides a comparison of different starting types and recommendations for their applications.
The Siemens SIRIUS soft starter series offers protection and optimization for motor starting and stopping processes. The 3RW30 model allows for optimal adjustment of starting voltage (40...100%) and time via a potentiometer, while the 3RW40 includes integrated motor overload protection and adjustable current limiting functions. This manual is written in Chinese.
| Starting Voltage Range (3RW30) | 40...100 % |
|---|---|
| Maximum Starting Time (3RW30) | 20 seconds |
| Overload Protection Class (3RW40) | Class 10, 15, 20 |
| Maximum Starting Frequency (3RW30) | 20 times per hour |
| Maximum Starting Current Limit (3RW40) | 300% of motor current Ie |
Soft starters reduce power loss and provide better protection for mechanical transmission devices compared to direct starting.
The 3RW40 provides soft stopping (0...20 seconds) and adjustable current limiting, whereas the 3RW30 focuses on starting.
The 3RW44 supports drive devices up to 710 kW with standard wiring or 1200 kW with internal delta wiring.