Product Overview
Technical Summary
| Product designation | SIRIUS soft starter |
|---|---|
| Rated operational current at 40 °C, standard circuit | 313 A |
| Rated operational current at 40 °C, inside-delta circuit | 542 A |
| Rated motor power at 400 V, standard circuit | 160 kW |
| Rated motor power at 400 V, inside-delta circuit | 315 kW |
| Operating voltage | 200 … 460 V AC |
| Control supply | 230 V AC at 50 Hz and 60 Hz |
| Mounting | Screw fixing; vertical mounting surface +/-90° rotatable and +/- 22.5° tiltable to the front and back |
| Main current connection | Busbar connection |
| Auxiliary and control connection | Screw-type terminals |
| Product lifecycle | Start of final year of support; successor is SIRIUS 3RW5, preferred successor type 3RW5545-6HA14 |
Key Features
- Product designation: SIRIUS soft starter.
- Rated operational current: 313 A at 40 °C in standard circuit; 542 A at 40 °C in inside-delta circuit.
- Motor power at 400 V: 160 kW in standard circuit and 315 kW in inside-delta circuit at 40 °C rated value.
- Voltage and control supply: 200 … 460 V AC operating voltage; 230 V AC control supply at 50 Hz and 60 Hz.
- Integrated functions: Integrated bypass contact system, thyristors, intrinsic device protection, motor overload protection, external reset, and adjustable current limitation.
- Mounting and connections: Screw fixing; busbar connection for the main current circuit and screw-type terminals for auxiliary and control circuits.
Frequently Asked Questions
What product does Siemens 3RW4445-6BC44 identify?
It identifies a SIRIUS soft starter with an integrated bypass contact system, thyristors, intrinsic device protection, motor overload protection, and external reset.
Which specifications distinguish this exact MLFB?
The listed variant has 313 A at 40 °C in standard circuit, 542 A at 40 °C in inside-delta circuit, 200 … 460 V AC operating voltage, and 230 V AC control supply.
What mounting and connection details should be checked?
Check screw fixing, the required 100 mm upward, 5 mm side, and 75 mm downward spacing for side-by-side mounting, plus busbar main-current and screw-type auxiliary/control connections.
What should be checked for quotation?
Check the complete order number 3RW4445-6BC44, the nameplate details, required quantity, and destination.
Is this product still supported?
It is at the start of the final year of support. The successor is SIRIUS 3RW5, with preferred successor type 3RW5545-6HA14.
