Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Rated operational current at 40 °C | 356 A in standard circuit |
| Rated operational current in inside-delta circuit at 40 °C | 617 A |
| Motor power at 400 V and 40 °C | 200 kW in standard circuit; 355 kW in inside-delta circuit |
| Operating voltage | 200 … 460 V in standard circuit and inside-delta circuit |
| Operating frequency | 50 … 60 Hz, with -10 % relative negative tolerance and 10 % relative positive tolerance |
| 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 | Screw fixing; vertical mounting surface, +/-90° rotatable and +/- 22.5° tiltable to the front and back |
| Front protection | IP00; IP20 with box terminal/cover |
| Product lifecycle | Start of final year of support |
Applications
- Motor overload protection: Provides motor overload protection with adjustable motor current and thermistor motor protection evaluation.
- Motor braking output control: Provides a motor brake output as an integrated product function.
Key Features
- Soft starter function: Has an integrated bypass contact system and thyristors for soft starter operation.
- Rated operational current: Rated operational current is 356 A at 40 °C, 315 A at 50 °C, and 280 A at 60 °C.
- Inside-delta operation: Supports inside-delta circuit operation with 617 A at 40 °C, 546 A at 50 °C, and 485 A at 60 °C.
- Motor protection: Has intrinsic device protection, motor overload protection, thermistor motor protection evaluation, external reset, and adjustable current limitation.
- Electrical connection: Uses busbar connection for the main current circuit and screw-type terminals for auxiliary and control circuits.
- Mounting and protection: Uses screw fixing; dimensions are 210 mm wide, 230 mm high, and 298 mm deep. Front protection is IP00, or IP20 with box terminal/cover.
Frequently Asked Questions
1. What is the rated current of Siemens 3RW4446-6BC44?
The rated operational current is 356 A at 40 °C, 315 A at 50 °C, and 280 A at 60 °C.
2. What current is available in inside-delta circuit operation?
For 3-phase motors in inside-delta circuit, the rated operational current is 617 A at 40 °C, 546 A at 50 °C, and 485 A at 60 °C.
3. What electrical connections does the soft starter use?
The main current circuit uses a busbar connection. Auxiliary and control circuits use screw-type terminals.
4. How is the 3RW4446-6BC44 mounted?
It uses screw fixing. With a vertical mounting surface, it is +/-90° rotatable and +/- 22.5° tiltable to the front and back.
5. What lifecycle detail should be checked before inquiry?
The product lifecycle is at the start of the final year of support; the preferred successor type is 3RW5546-6HA14.
