Siemens SIRIUS 3RW4425-1BC44 Soft Starter 55kW Motor Controller

Siemens SIRIUS 3RW4425-1BC44 Soft Starter

The Siemens 3RW4425-1BC44 SIRIUS soft starter offers safe and smooth motor starts up to 55 kW. It delivers 57 A in standard wiring and 99 A in inside-delta configuration. Compact, reliable, and ideal for automation systems. Author: Powergear X Automation.

Main Highlights

• Supports 200–460 V AC operating voltage with 230 V AC control voltage.
• Handles 57 A at 30 kW (standard) and 99 A at 55 kW (inside-delta).
• Equipped with integrated thyristors and bridging contact system.
• Provides intrinsic device protection and motor overload control.
• Adjustable current limitation ensures flexible operation for diverse loads.

Technical Data

• Brand: Siemens
• Series: SIRIUS
• Model: 3RW4425-1BC44
• Rated Current: 57 A @ 40°C, 51 A @ 50°C, 45 A @ 60°C
• Inside-delta Current: 99 A @ 40°C, 88 A @ 50°C
• Power Output: 30 kW (400 V) standard / 55 kW inside-delta
• Operating Voltage Range: 200–460 V AC ± 10 %
• Frequency: 50 – 60 Hz ± 10 %
• Control Supply: 230 V AC ± 15 %
• Display: Fault indication LED
• Power Loss: Typical 36 W at 40°C
• Continuous Current: 115 % of Ie @ 40°C
• Protection Class: IP00
• Mounting Type: Screw fixing / vertical
• Dimensions: W 170 mm × H 192 mm × D 270 mm
• Altitude Limit: Up to 5000 m above sea level
• Ambient Temperature: –25 °C to +60 °C
• Cable Length: Max 500 m

Wiring & Connections

• Box terminals for main current circuit and screw terminals for control wiring.
• Accepts solid, stranded, and fine-stranded cables from 2.5 mm² to 70 mm².
• Supports AWG 10 – 2/0 conductors.
• Auxiliary contacts: 3 NO + 1 changeover.

Performance & Reliability

• Efficient inside-delta start mode reduces power loss by up to 50 %.
• Thermistor motor protection evaluation prevents overheating.
• External reset input enhances operational flexibility.
• Meets UL/CSA B300 / R300 ratings for industrial use.

Installation Guidelines

• Ensure 100 mm top, 5 mm side, and 75 mm bottom clearance for air flow.
• Mount vertically within ± 22.5° tilt for best thermal performance.
• Use busbar or dual clamping for high-current applications.

Packaging & Shipping

• Includes 1 × Siemens SIRIUS Soft Starter 3RW4425-1BC44.
• Quick setup manual and label kit included.
• Secure shipping via FedEx, UPS, or DHL.
• Backed by a 12-month warranty from Powergear X Automation.

FAQ

• Q: How do I select between standard and inside-delta circuits?
  A: Use inside-delta wiring when higher motor power (up to 55 kW) is required.
• Q: Can this soft starter work in hot environments?
  A: Yes, it operates up to 60°C with proper ventilation.
• Q: What are the benefits of the integrated thyristors?
  A: They provide smooth voltage ramp control and protect against surges.
• Q: How can I reset the device after a trip?
  A: Simply activate the external reset input for fast restart.
• Q: What installation distance is recommended between units?
  A: Keep at least 5 mm between side-by-side devices to avoid overheating.

Contact Information

• Email us at sales@powergearx.com
• Chat via WhatsApp: +86 18030005825
• Visit Powergear X Automation for more products.

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