Siemens 3RW4457-6BC44 SIRIUS Soft Starter 880A 500kW

Siemens 3RW4457-6BC44 SIRIUS Soft Starter — 3RW4457-6BC44

The Siemens SIRIUS 3RW4457-6BC44 is a high-power soft starter for large motors up to 900 kW. It ensures gentle starts, reduced stress, and steady performance. This model is now phased out — the preferred successor is 3RW5556-6HA14.

Quick Highlights

• Rated current: 880 A (standard), 1524 A (inside-delta)
• Power: 500 kW at 400V, up to 900 kW inside-delta
• Voltage range: 200–460 V AC | Control: 230 V AC
• Frequency: 50–60 Hz with ±10% tolerance
• Insulation voltage: 690 V | Pollution degree 3

Technical Information

• Continuous current: 115% at 40°C
• Power loss: about 250 W during operation
• Minimum load: 8% of IM
• Motor current adjustment min: 176 A
• Thermistor protection and external reset available

Mechanical & Mounting

• Dimensions: 510 mm W × 640 mm H × 290 mm D
• Mounting: screw fixing, ±90° rotatable, ±22.5° tilt
• Clearances: top 100 mm, bottom 75 mm, side 5 mm
• Cable length: up to 500 m | Altitude: max 5000 m
• Main circuit: busbar | Control: screw terminals

Performance Features

• Built-in thyristors and bypass contact system
• Supports inside-delta wiring for higher power range
• Integrated motor brake output for quick stops
• Display indicator for quick fault diagnosis
• Excellent overload and device protection

Environmental & Reliability

• Ambient temp: -25°C to +60°C | Storage: up to +80°C
• IP00 open type, for enclosed installations
• Complies with IEC 60947 and IEC 60721 standards
• Durable for harsh transport and operation conditions
• Warranty: 12 months from Powergear X Automation

Shipping & Support

• Ships globally via FedEx, UPS, and DHL
• Each unit tested before dispatch
• Includes detailed wiring and setup guide
• For technical inquiries, contact sales@powergearx.com
• WhatsApp support: +86 18030005825

Five Professional FAQs

• Q: Can this soft starter replace the 3RW5556-6HA14 directly?
  A: It can operate similarly but the 3RW5 offers higher efficiency and better monitoring.
• Q: What’s the main difference between standard and inside-delta setup?
  A: Inside-delta reduces current per line and allows larger motor power with the same frame size.
• Q: How should I manage heat at 880A continuous load?
  A: Keep clearance space, ensure airflow, and check terminal torque every 6 months.
• Q: How do I test motor protection before startup?
  A: Simulate overload by adjusting current limit; verify trip timing under control voltage.
• Q: Any tip for long cable installation up to 500m?
  A: Use shielded power cables, proper grounding, and verify voltage drop below 3%.

Author & Contact

• Author: Powergear X Automation
• Email: sales@powergearx.com
• WhatsApp: +86 18030005825

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

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