Product Description
Key Features
- Soft starter identity: SIRIUS soft starter, Siemens order number 3RW4447-6BC44, with integrated bypass contact system and thyristors.
- Standard-circuit performance: Rated operational current: 432 A at 40 °C, 385 A at 50 °C, and 335 A at 60 °C. Continuous operating current: 115 % of Ie at 40 °C.
- Inside-delta performance: Rated operational current for 3-phase motors in inside-delta circuit: 748 A at 40 °C, 667 A at 50 °C, and 580 A at 60 °C.
- Protection and control functions: Has intrinsic device protection, motor overload protection, thermistor motor protection evaluation, external reset, adjustable current limitation, and motor brake output.
- Connections and mounting: Main current circuit: busbar connection with 3 poles. Auxiliary and control circuit: screw-type terminals. Dimensions: 210 mm width, 230 mm height, and 298 mm depth; fastening method: screw fixing.
Technical Summary
| Product designation | Soft starter |
|---|---|
| Rated operational current at 40 °C | 432 A |
| Rated operational current in inside-delta circuit at 40 °C | 748 A |
| Operating voltage | 200 … 460 V |
| Operating frequency | 50 … 60 Hz |
| Control supply voltage | 230 V AC at 50 Hz and 60 Hz |
| Main current connection | Busbar connection |
| Auxiliary and control connection | Screw-type terminals |
| Mounting position | With vertical mounting surface +/-90° rotatable; +/- 22.5° tiltable to the front and back |
| Protection class on the front | IP00; IP20 with box terminal/cover |
| Product lifecycle | Start of final year of support |
Frequently Asked Questions
What rated current does Siemens 3RW4447-6BC44 provide at 40 °C?
It provides 432 A in standard circuit and 748 A for 3-phase motors in inside-delta circuit at 40 °C.
What operating voltage and control supply does this soft starter use?
Operating voltage is 200 … 460 V. The control supply voltage is 230 V AC at 50 Hz and 60 Hz.
What connections and mounting dimensions should be confirmed?
The main current circuit uses a busbar connection, while auxiliary and control circuits use screw-type terminals. Dimensions are 210 mm x 230 mm x 298 mm, with screw fixing.
What lifecycle information should be checked for this exact order number?
The product lifecycle is at the start of the final year of support. Confirm the required quantity, destination, condition preference, and requested date for a legacy-part verification inquiry.
