3RW4458-6BC44 Siemens SIRIUS Soft Starter 970A 560kW

SIRIUS 3RW4458-6BC44 Soft Starter – High-Performance Motor Control

Key Technical Specifications

• Brand & Model: Siemens SIRIUS 3RW4458-6BC44 (phase-out, successor 3RW5556-6HA14).
• Rated operational current: 970 A at 40 °C; 850 A at 50 °C; 760 A at 60 °C.
• Inside-delta current: 1680 A (40 °C), 1472 A (50 °C), 1316 A (60 °C).
• Motor power (400 V): 560 kW (standard) and 1000 kW (inside-delta).
• Operating voltage: 200 – 460 V AC (standard and inside-delta).
• Control supply: 230 V AC, 50/60 Hz (±10%).
• Insulation voltage: 690 V rated, pollution degree 3 (IEC 60947-4-2).
• Integrated protection: motor overload, thermistor evaluation, adjustable current limit.

Mechanical & Environmental Data

• Dimensions (W x H x D): 510 x 640 x 290 mm; screw fixing mounting.
• Ambient temperature: up to 60 °C operation; storage -25 … +80 °C.
• Installation altitude: 5000 m max; derating above 40 °C.
• Protection class: IP00; requires proper enclosure.
• Power loss: only 270 W typical at rated current.

Frequently Asked Questions (FAQ)

• Q: Is this starter suitable for 400 V 560 kW motors?
  A: Yes, at 400 V standard circuit it delivers 560 kW; inside-delta delivers 1000 kW.
• Q: Can I use it with a 230 V control supply?
  A: Absolutely, the control circuit accepts 230 V AC, 50/60 Hz.
• Q: What is the maximum ambient temperature for full rating?
  A: Rated current is specified at 40 °C; derate above that up to 60 °C.
• Q: Does it include motor overload protection?
  A: Yes, it features adjustable motor overload and thermistor protection.
• Q: How do I connect the bypass contact?
  A: The integrated bypass reduces heat and wear; no external wiring required.

Contact Information
For inquiries: sales@nex-auto.com  |  +86 153 9242 9628 (WhatsApp)
Partner: NexAuto Technology Limited