Product Description
Key Features
- Soft starter identity: SIRIUS soft starter, product designation Soft starter, order number 3RW4427-3BC44.
- Operational current: Rated operational current: 93 A at 40 °C, 82 A at 50 °C, and 72 A at 60 °C. Inside-delta circuit: 161 A at 40 °C, 142 A at 50 °C, and 125 A at 60 °C.
- Motor power at 400 V: At 400 V, the rated motor power is 45 kW in the standard circuit and 90 kW in the inside-delta circuit.
- Operating and control supply: Operating voltage: 200 … 460 V in the standard and inside-delta circuits. Control supply: AC, 230 V at 50 Hz and 60 Hz.
- Protection and control functions: Has integrated bypass contact system, thyristors, intrinsic device protection, motor overload protection, thermistor motor protection evaluation, external reset, adjustable current limitation, and motor brake output.
- Installation and connections: Dimensions: 170 mm width, 192 mm height, and 270 mm depth. Screw fixing, box terminal for the main current circuit, and spring-loaded terminals for auxiliary and control circuits.
Technical Summary
| Product lifecycle | Start of final year of support |
|---|---|
| Rated operational current | 93 A at 40 °C; 82 A at 50 °C; 72 A at 60 °C |
| Inside-delta operational current | 161 A at 40 °C; 142 A at 50 °C; 125 A at 60 °C |
| Motor power at 400 V | 45 kW standard circuit; 90 kW inside-delta circuit |
| Operating voltage | 200 … 460 V standard circuit and inside-delta circuit |
| Control supply | AC, 230 V at 50 Hz and 60 Hz |
| Insulation voltage rated value | 690 V |
| 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 |
Frequently Asked Questions
What exact model should be confirmed for this soft starter?
Confirm Siemens SIRIUS 3RW4427-3BC44 and the installed configuration, including standard or inside-delta circuit.
What current and motor power ratings should be checked?
Check 93 A at 40 °C in the standard circuit, 161 A at 40 °C in the inside-delta circuit, 45 kW at 400 V in the standard circuit, and 90 kW at 400 V in the inside-delta circuit.
What control supply and terminals does it have?
It has an AC control supply of 230 V at 50 Hz and 60 Hz, a box terminal for the main current circuit, and spring-loaded terminals for auxiliary and control circuits.
What mounting details should be verified?
Verify screw fixing, dimensions of 170 mm x 192 mm x 270 mm, the permitted mounting-surface positions, and the required 100 mm upward, 5 mm side, and 75 mm downward spacing.
