Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Product type | Soft starter |
| Rated operational current at 40 °C, standard circuit | 93 A |
| Rated motor power at 400 V, standard circuit | 45 kW |
| Rated operational current at 40 °C, inside-delta circuit | 161 A |
| Rated motor power at 400 V, inside-delta circuit | 90 kW |
| Operating voltage | 200 … 460 V AC |
| Control supply | 230 V AC at 50 Hz and 60 Hz |
| Main current connection | Box terminal |
| Auxiliary and control connection | Spring-loaded terminals |
| Mounting | Screw fixing; vertical mounting surface +/-90° rotatable and +/- 22.5° tiltable to the front and back |
| Front protection | IP20 according to IEC 60529 |
| Product lifecycle | Start of final year of support |
Applications
- Motor starting: Controls motor starting through a soft-start function using thyristors and an integrated bypass contact system.
- Motor protection: Provides intrinsic device protection, motor overload protection, and evaluation of thermistor motor protection.
- Motor braking: Provides a motor brake output.
Key Features
- Soft-start motor control: Soft starter with thyristors, integrated bypass contact system, intrinsic device protection, motor overload protection, and adjustable current limitation.
- Standard-circuit rating: Rated operational current is 93 A at 40 °C; rated motor power is 45 kW at 400 V in standard circuit.
- Inside-delta operation: Inside-delta circuit supports 161 A at 40 °C and 90 kW at 400 V; minimum load is 8 %.
- Voltage and control supply: Operating voltage is 200 … 460 V in standard and inside-delta circuits. The AC control supply is 230 V at 50 Hz and 60 Hz.
- Protection and functions: The device has evaluation of thermistor motor protection, external reset, a motor brake output, and a Display version for fault signals.
- Installation and connections: Dimensions are 170 mm wide, 192 mm high, and 270 mm deep. Screw fixing, box terminal for the main current circuit, and spring-loaded terminals for auxiliary and control circuits.
Frequently Asked Questions
1. What is the rated current of the Siemens 3RW4427-3BC44?
The rated operational current is 93 A at 40 °C in standard circuit, or 161 A at 40 °C in inside-delta circuit.
2. What motor power is supported at 400 V?
The rated motor power is 45 kW at 400 V in standard circuit and 90 kW at 400 V in inside-delta circuit.
3. What operating and control voltages does it use?
Operating voltage is 200 … 460 V in both standard and inside-delta circuits. The AC control supply is 230 V at 50 Hz and 60 Hz.
4. How is the soft starter connected and mounted?
It uses a box terminal for the main current circuit and spring-loaded terminals for auxiliary and control circuits. Mounting is by screw fixing.
