Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Product type | SIRIUS soft starter |
| Rated operational current at 40 °C | 250 A |
| Rated motor power at 400 V, standard circuit | 132 kW |
| Rated motor power at 400 V, inside-delta circuit | 250 kW |
| Operating voltage | 200 … 460 V |
| Operating frequency | 50 … 60 Hz |
| Control supply | 230 V AC at 50 Hz and 60 Hz |
| Main current connection | Busbar connection |
| Auxiliary and control connection | Screw-type terminals |
| Mounting | Screw fixing |
Applications
- Motor overload protection: Provides motor overload protection with adjustable motor current and evaluation of thermistor motor protection.
- Motor braking: Provides a motor brake output as an integrated product function.
Key Features
- Soft starter function: SIRIUS soft starter with thyristors, integrated bypass contact system, intrinsic device protection, motor overload protection, thermistor motor protection evaluation, and external reset.
- Rated current and motor power: Rated operational current is 250 A at 40 °C, 215 A at 50 °C, and 185 A at 60 °C. At 400 V, rated motor power is 132 kW in standard circuit and 250 kW in inside-delta circuit.
- Inside-delta circuit: Supports inside-delta circuit with 433 A rated operational current at 40 °C, 372 A at 50 °C, and 320 A at 60 °C. Minimum load is 8%.
- Operating voltage and frequency: Operating voltage is 200 … 460 V with -15 % relative negative tolerance and 10 % relative positive tolerance in standard and inside-delta circuits. Rated operating frequency is 50 … 60 Hz.
- Control supply: AC control supply is 230 V at 50 Hz and 60 Hz, with -15 % relative negative tolerance and 10 % relative positive tolerance.
- Connections and mounting: Main current circuit uses busbar connection; auxiliary and control circuits use screw-type terminals. Screw fixing is provided, with vertical mounting surface and specified spacing of 100 mm upwards, 5 mm at the side, and 75 mm downwards.
Frequently Asked Questions
1. What is the rated current of Siemens 3RW4444-6BC44?
The rated operational current is 250 A at 40 °C, 215 A at 50 °C, and 185 A at 60 °C.
2. What motor power does 3RW4444-6BC44 support at 400 V?
The rated motor power is 132 kW in standard circuit and 250 kW in inside-delta circuit at 400 V.
3. What control supply does this soft starter use?
It uses a 230 V AC control supply at 50 Hz and 60 Hz.
4. How is 3RW4444-6BC44 connected?
The main current circuit uses a busbar connection. Auxiliary and control circuits use screw-type terminals.
5. What should be verified before requesting a quote?
Verify the circuit type, motor power, operating voltage, rated current at the intended temperature, mounting clearances, and connection requirements.
