Siemens 3RW4446-6BC44: High-Capacity Motor Control Solution

The 3RW4446-6BC44 from Siemens SIRIUS series delivers exceptional motor management. This industrial soft starter handles the most demanding three-phase applications. It provides smooth acceleration for heavy machinery and equipment. The advanced design ensures reliable performance in tough environments.

Essential Technical Specifications

• Manufacturer: Siemens
• Product Line: SIRIUS Soft Starter
• Model Code: 3RW4446-6BC44
• Operating Current: 356A standard, 617A inside-delta
• Power Rating: 355 kW at 400V inside-delta
• Supply Voltage: 200-460 V AC range
• Control Voltage: 230 V AC 50/60 Hz
• Insulation Strength: 690 V rated
• Frequency Operation: 50-60 Hz ±10%

Advanced Protection Features

• Integrated bypass contactor reduces energy consumption
• Complete motor overload protection prevents damage
• Thermistor monitoring for temperature-based shutdown
• Adjustable current limiting protects your equipment
• Intrinsic device safety ensures operational reliability
• External reset function allows remote operation
• Motor brake output provides controlled stopping

Performance Characteristics

• Standard Circuit Power: 200 kW at 400V
• Inside-Delta Capacity: 355 kW maximum output
• Temperature Performance: 315A at 50°C, 280A at 60°C
• Inside-Delta Current: 546A at 50°C, 485A at 60°C
• Minimum Load Requirement: 8% system capacity
• Power Dissipation: 174W typical operation
• Continuous operation capability at 115% rated current

Installation Requirements

• Unit Dimensions: 210 × 230 × 298 mm (W×H×D)
• Mounting Type: Screw fixation method
• Mounting Flexibility: ±90° rotation capability
• Clearance Space: 100mm top, 5mm sides, 75mm bottom
• Maximum Wiring Distance: 500 meters
• Enclosure Rating: IP00 standard, IP20 with cover

Electrical Connection Data

• Main Circuit: Busbar or screw terminal options
• Control Terminals: Screw-type connection system
• Conductor Range: 70-240 mm² front, 120-185 mm² back
• Contact Configuration: 3 NO + 1 CO auxiliary contacts
• Control Wiring: 0.5-2.5 mm² solid or stranded
• AWG Compatibility: 2/0 to 500 kcmil main circuits

Environmental Specifications

• Operating Temperature: Maximum 60°C ambient
• Storage Conditions: -25°C to +80°C range
• Performance Derating: Starts above 40°C
• Installation Altitude: Up to 5000 meters ASL
• Pollution Degree: Level 3 industrial environments
• Resists vibration, humidity, and non-conductive dust

Shipping & Package Contents

• Factory-fresh 3RW4446-6BC44 soft starter unit
• All necessary mounting hardware included
• Protective packaging ensures perfect condition
• Global shipping via FedEx, UPS, and DHL carriers
• 12-month product warranty from delivery date

Expert Technical Questions

• What applications suit this high-current soft starter?
• This unit perfectly handles large industrial pumps and heavy conveyors. It manages high-inertia loads like crushers and large fans effectively.
• How does the inside-delta configuration benefit users?
• The inside-delta connection nearly doubles your motor power capacity. This design significantly reduces overall system costs for high-power applications.
• What maintenance does this soft starter require?
• Regular thermal imaging checks of connections ensure optimal performance. We recommend annual inspection of all power terminals and cooling surfaces.
• Can this starter coordinate with existing PLC systems?
• Yes, the multiple auxiliary contacts provide excellent control integration. The device communicates status through programmable output signals.
• What happens during power fluctuation conditions?
• The unit maintains stable operation through voltage variations from -15% to +10%. It automatically recovers when power returns to normal parameters.

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