Key Features
- Soft starter: SIRIUS soft starter for controlled motor starting.
- Integrated bypass contact system: Integrated bypass contact system and thyristors.
- Protection and current control: Intrinsic device protection, motor overload protection, thermistor motor protection evaluation, and adjustable current limitation.
- Electrical ratings: 250 A at 40 °C standard, 433 A inside-delta, and 200-460 V AC operating voltage.
- Control supply: 230 V AC control supply with 50 Hz and 60 Hz frequency ratings.
- Connection and mounting: Busbar connection for the main current circuit, screw-type terminals for auxiliary and control circuit, and screw fixing.
Technical Summary
| Product designation | Soft starter |
|---|---|
| Product brand name | SIRIUS |
| Integrated bypass contact system | Yes |
| Thyristors | Yes |
| Motor overload protection | Yes |
| Adjustable current limitation | Yes |
| Operating current at 40 °C | 250 A |
| Operating current for 3-phase motors at inside-delta circuit at 40 °C | 433 A |
| Operating voltage at standard circuit | 200 … 460 V |
| Control supply voltage | 230 V |
| Control supply frequency | 50 Hz |
| Main current circuit connection | busbar connection |
Applications
- Controlled motor starting: Soft starting with adjustable current limitation for a motor.
- Motor protection: Motor overload protection and thermistor motor protection evaluation for a motor.
Frequently Asked Questions
What is Siemens 3RW4444-6BC44?
It is a SIRIUS soft starter.
What are the main current ratings of 3RW4444-6BC44?
The ratings are 250 A at 40 °C standard and 433 A for 3-phase motors at inside-delta circuit at 40 °C.
What control supply does 3RW4444-6BC44 use?
The control supply is AC 230 V with 50 Hz and 60 Hz frequency ratings.
How is the main current circuit connected on 3RW4444-6BC44?
The main current circuit uses a busbar connection.
Is 3RW4444-6BC44 a current production item?
It is marked as a phased-out product, and the preferred successor type is 3RW5544-6HA14.
