Siemens SIRIUS Soft Starter 3RW4446-6BC44 – High Power Motor Starter

Siemens SIRIUS 3RW4446-6BC44 Soft Starter

High power soft starter for large industrial motors. Simple setup. Strong protection. Author: Powergear X Automation.

Quick Specs

• Model: 3RW4446-6BC44
• Standard mode: 356 A
• Inside-delta mode: 617 A
• Motor power: 355 kW @ 400 V (inside-delta)
• Control supply: 230 V AC
• Rated insulation voltage: 690 V

Why Choose This Model

• Lower stress on motor and cables
• Built-in bypass relay reduces heat and saves energy
• Real motor protection: overload + thermistor (PTC)
• Can reset faults from remote system
• Supports motor brake output for fast stop

Electrical Ratings

• Operating voltage: 200–460 V AC
• Frequency: 50 / 60 Hz
• Current limit adjustable
• Power loss at rated current: 174 W
• Minimum motor load: 8%
• Continuous operating current: 115% at 40°C

Motor Output Power

• Standard wiring: 200 kW @ 400 V
• Inside-delta: 355 kW @ 400 V
• Standard wiring: 110 kW @ 230 V
• Inside-delta: 200 kW @ 230 V

Size & Wiring

• Width: 210 mm
• Height: 230 mm
• Depth: 298 mm
• Main busbar cable range: 70–240 mm²
• Aux terminals: 3 NO + 1 changeover
• Max cable length: 500 m

Environmental & Safety

• Max operating temp: 60°C
• Storage: -25 to +80°C
• Altitude: up to 5000 m
• Protection rating: IP00 (IP20 with terminal cover)

Warranty & Delivery

• Warranty: 12 months
• Shipping via FedEx / UPS / DHL

FAQ

• Q: When should I use inside-delta wiring?
• A: Use it when you need higher current capacity without increasing panel space.
• Q: What if the motor does not start smoothly?
• A: Reduce the ramp-up time and increase the starting current step-by-step.
• Q: Can I combine this with external motor protection?
• A: Yes, but the unit already includes thermistor and overload logic.
• Q: Is extra cooling needed?
• A: Leave free clearance above (100 mm) and below (75 mm) to remove heat.
• Q: What is the typical installation issue you see?
• A: Cable torque is often too low. Always tighten per the rated torque for busbar.

Contact Information

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825

Original Source: https://www.powergearx.com/

Partner: Ubest Automation Limited

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