Product Overview
Technical Summary
| Product designation | Soft starter |
|---|---|
| Rated operational current at 40 °C | 313 A |
| Rated operational current at 50 °C | 280 A |
| Rated operational current at 60 °C | 250 A |
| Operational current for 3-phase motors, inside-delta circuit, at 40 °C | 542 A |
| Motor power at 400 V, standard circuit, at 40 °C | 160 kW |
| Motor power at 400 V, inside-delta circuit, at 40 °C | 315 kW |
| Operating voltage, standard circuit | 200 … 460 V, -15 % / 10 % tolerance |
| Control supply voltage | 230 V AC at 50 Hz and 60 Hz, -15 % / 10 % tolerance |
| Main current connection | Busbar connection |
| Auxiliary and control connection | Screw-type terminals |
| Lifecycle | Start of final year of support; preferred successor type 3RW5545-6HA14 |
Key Features
313 A at 40 °C, 280 A at 50 °C, and 250 A at 60 °C in the standard circuit.
542 A at 40 °C, 485 A at 50 °C, and 433 A at 60 °C for 3-phase motors in the inside-delta circuit.
160 kW at 40 °C in the standard circuit and 315 kW at 40 °C in the inside-delta circuit.
Has intrinsic device protection, motor overload protection, thermistor motor protection evaluation, external reset, adjustable current limitation, and a motor brake output.
Uses a busbar connection for the main current circuit and screw-type terminals for auxiliary and control circuits; screw fixing and vertical mounting surface installation are supported.
Product lifecycle: Start of final year of support. Successor is SIRIUS 3RW5; preferred successor type is 3RW5545-6HA14.
Frequently Asked Questions
What is the exact product designation?
The exact product designation is Siemens 3RW4445-6BC44, SIRIUS soft starter.
What rated current does the 3RW4445-6BC44 provide?
It has 313 A at 40 °C, 280 A at 50 °C, and 250 A at 60 °C in the standard circuit.
What connections does this soft starter have?
The main current circuit uses a busbar connection. Auxiliary and control circuits use screw-type terminals.
What control supply does it require?
The control supply is 230 V AC at 50 Hz and 60 Hz, with a -15 % / 10 % tolerance.
How should I request this line item for a project quotation?
Provide the required quantity, destination, schedule context, and any additional BOM line items with the exact product number.
