3RW4453-6BC44 Siemens SIRIUS Soft Starter 551A 315kW

Siemens 3RW4453-6BC44 SIRIUS Soft Starter – 551A, 315kW

Core Technical Specifications

• Manufacturer: Siemens – 3RW4453-6BC44 SIRIUS series (phase-out, successor 3RW5556-6HA14).
• Rated current (400 V, 40 °C): 551 A standard; 954 A inside-delta.
• Motor power (400 V): 315 kW (standard) and 560 kW (inside-delta).
• Operating voltage: 200 – 460 V AC, with ±15% tolerance.
• Control supply: 230 V AC, 50/60 Hz ( ±10% frequency tolerance).
• Integrated protection: motor overload, thermistor evaluation, adjustable current limitation.
• Power loss: only 159 W typical at rated current (40 °C).

Mechanical & Environmental Data

• Dimensions (W x H x D): 510 x 640 x 290 mm; weight 67 kg.
• Mounting: screw fixing; vertical surface ±90° rotatable, ±22.5° tilt.
• Ambient temperature: operation up to 60 °C; storage -25 … +80 °C.
• Installation altitude: 5000 m max; derating above 40 °C.
• Protection class: IP00 (requires external enclosure).

Connections & Wiring Details

• Main circuit: busbar connection; cable lugs 50–240 mm² (stranded).
• Auxiliary contacts: 3 NO, 1 CO; screw terminals (0.5–2.5 mm²).
• AWG conductors: main 2/0 – 500 kcmil; auxiliary 20–14 AWG.
• Spacing requirements: 100 mm top, 75 mm bottom, 5 mm side.
• Max cable length: 500 m for control circuits.

Frequently Asked Questions (FAQ)

• Q: Is this starter suitable for a 315 kW motor at 400 V?
  A: Yes, the 3RW4453-6BC44 provides exactly 315 kW at 400 V standard circuit.
• Q: Can I use it with a 230 V AC control supply?
  A: Absolutely, the control circuit accepts 230 V AC, 50/60 Hz.
• Q: What is the maximum ambient temperature for full current rating?
  A: Rated current is specified at 40 °C; derate above that up to 60 °C.
• Q: Does the device include motor overload protection?
  A: Yes, it features adjustable overload and thermal resistor (PTC) protection.
• Q: How do I connect the integrated bypass?
  A: The bypass system is internal – no external wiring needed for operation.

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