Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Product type | Soft starter |
| Rated operational current at 40 °C, standard circuit | 77 A |
| Rated operational current at 40 °C, inside-delta circuit | 133 A |
| Rated power at 400 V, standard circuit | 37 kW |
| Rated power at 400 V, inside-delta circuit | 75 kW |
| Operating voltage | 200 … 460 V |
| Control supply | 230 V AC at 50 Hz or 60 Hz |
| Main-circuit connection | Box terminal |
| Auxiliary and control-circuit connection | Spring-loaded terminals |
| Fastening method | Screw fixing |
| Front protection | IP20 |
Applications
- Motor soft starting: Provides soft starter functionality for 3-phase motors, including adjustable current limitation and inside-delta circuit operation.
Key Features
- Soft starter function: SIRIUS soft starter with thyristors, integrated bypass contact system, and inside-delta circuit.
- Motor protection: Has intrinsic device protection, motor overload protection, thermistor motor protection evaluation, and external reset.
- Standard-circuit rating: Rated operational current is 77 A at 40 °C; at 400 V in standard circuit, the rated value is 37 kW.
- Inside-delta rating: Rated operational current is 133 A at 40 °C in inside-delta circuit; at 400 V, the rated value is 75 kW.
- Control supply and connections: Control supply is 230 V AC at 50 Hz or 60 Hz; auxiliary and control circuits use spring-loaded terminals.
- Installation data: Dimensions are 170 mm wide, 192 mm high, and 270 mm deep; fastening is by screw fixing and front protection is IP20.
Frequently Asked Questions
1. What type of device is Siemens 3RW4426-3BC44?
It is a SIRIUS soft starter with thyristors, an integrated bypass contact system, and an inside-delta circuit.
2. What is the rated current at 40 °C?
The rated operational current is 77 A in standard circuit and 133 A in inside-delta circuit.
3. What power is supported at 400 V?
The rated value is 37 kW in standard circuit and 75 kW in inside-delta circuit.
4. What control supply does it use?
The control supply is 230 V AC at 50 Hz or 60 Hz.
5. How is the unit mounted and connected?
It uses screw fixing. The main current circuit has a box terminal, while auxiliary and control circuits use spring-loaded terminals.
