Product details
Siemens 3RW4455-6BC44 SIRIUS Soft Starter
Author: Powergear X Automation
✔ 100% Original | ✔ New in factory seal | ✔ 12-month warranty
Shipping via FedEx / UPS / DHL
- Manufacturer: Siemens
- Model: 3RW4455-6BC44
- Type: SIRIUS Soft Starter (High-Feature)
- Rated Current: 693 A (40°C)
- Inside-Delta Current: up to 1200 A
- Power Rating: up to 710 kW (inside-delta / 400 V)
- Control Voltage: 230 V AC
- Main Voltage: 200–460 V AC | 50/60 Hz
- Terminals: Screw terminals
Key Benefits
- Reduces start current and protects motors
- Soft, smooth start — less impact on gearbox & belts
- Built-in overload and motor thermistor protection
- No external contactor needed — integrated bypass
- Inside-delta wiring saves space and reduces heat
- Easy panel installation — busbar ready
Core Electrical Details
- At 40°C: 693 A (standard) / 1200 A (inside-delta)
- At 60°C: 551 A (standard) / 954 A (inside-delta)
- Max power loss: 220 W (typical)
- Minimum motor load: ≥ 8%
- Adjustable overload current: from 138 A
Control & Display
- Voltage: 230 V AC (50/60 Hz)
- Alarm / fault display: LED
- External reset input
Size & Installation
- Width: 510 mm
- Height: 640 mm
- Depth: 290 mm
- Mounting: Screw fixing
- Altitude: up to 5000 m
- Protection: IP00
Why Buy From Powergear X Automation?
- Fast delivery — FedEx / UPS / DHL
- New & original factory packaging
- 12-month warranty
- Industry engineers with 10+ years experience
Contact Us
Email: sales@powergearx.com
WhatsApp: +86 18030005825
FAQ
- Q1. How do I know if the 3RW4455-6BC44 fits my motor?
A: Check motor power (kW/HP) and rated current. If unsure, send your motor plate photo to us. - Q2. Can this soft starter replace a VFD?
A: It reduces start current only. It does not provide speed control like a VFD. - Q3. Is inside-delta wiring required?
A: Not required, but it allows higher current rating and smaller starter size. - Q4. Do I need an external bypass contactor?
A: No. This model has an integrated bypass system. - Q5. What failure signs should I look for in old soft starters?
A: Frequent tripping, thermal alarms, uneven phase current—usually means wear in power semiconductors.
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