Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Product type | Soft starter |
| Rated operational current at 40 °C, standard circuit | 970 A |
| Rated operational current at 40 °C, inside-delta circuit | 1 680 A for 3-phase motors |
| Operating voltage, standard circuit | 200 … 460 V |
| Operating voltage, inside-delta circuit | 200 … 460 V |
| Motor power at 400 V, standard circuit | 560 kW at 40 °C |
| Motor power at 400 V, inside-delta circuit | 1 000 kW at 40 °C |
| 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 |
Applications
- Motor overload protection: Provides motor overload protection with adjustable motor current and thermistor motor protection evaluation.
- Motor braking: Provides a motor brake output as a product component.
Key Features
- Rated operational current: 970 A at 40 °C in standard circuit; 850 A at 50 °C and 760 A at 60 °C.
- Inside-delta current: 1 680 A at 40 °C, 1 472 A at 50 °C, and 1 316 A at 60 °C for 3-phase motors.
- Operating voltage: 200 … 460 V rated value for both standard circuit and inside-delta circuit, with -15 % relative negative tolerance and 10 % relative positive tolerance.
- Motor protection functions: Intrinsic device protection, motor overload protection, evaluation of thermistor motor protection, external reset, and adjustable current limitation.
- Connections and contacts: Busbar connection for the main current circuit; screw-type terminals for auxiliary and control circuits; 3 NO and 1 CO auxiliary contacts.
- Mounting and dimensions: Screw fixing; 510 mm width, 640 mm height, and 290 mm depth; front protection class IP00 according to IEC 60529.
Frequently Asked Questions
1. What is the rated current of the Siemens 3RW4458-6BC44?
The rated current is 970 A at 40 °C in standard circuit and 1 680 A at 40 °C in inside-delta circuit for 3-phase motors.
2. What operating voltage does the 3RW4458-6BC44 support?
The rated operating voltage is 200 … 460 V for both standard circuit and inside-delta circuit, with -15 % relative negative tolerance and 10 % relative positive tolerance.
3. What connections does this soft starter use?
It has a busbar connection for the main current circuit and screw-type terminals for auxiliary and control circuits.
4. How is the 3RW4458-6BC44 mounted?
It uses screw fixing. The dimensions are 510 mm wide, 640 mm high, and 290 mm deep.
