Siemens 3RW4443-6BC44 SIRIUS Soft Starter: Powerful Motor Control Solution

The Siemens 3RW4443-6BC44 SIRIUS soft starter provides excellent motor control and protection. This advanced device manages three-phase motor startup and shutdown smoothly. It significantly reduces mechanical stress on your equipment. The integrated bypass system improves energy efficiency during operation.

Product Identification & Basic Specifications

• Manufacturer Brand: Siemens
• Product Series: SIRIUS Soft Starter
• Model Number: 3RW4443-6BC44
• Voltage Range: 200-460 V AC
• Rated Current: 203 A at 40°C
• Motor Power Capacity: Up to 200 kW
• Control Voltage: 230 V AC
• Insulation Rating: 690 V
• Frequency Range: 50-60 Hz

Key Features & Protection Functions

• Integrated bypass contactor for efficient running operation
• Complete motor overload and thermal protection system
• Adjustable current limiting for customized start profiles
• Supports both standard and inside-delta configurations
• Motor brake output for controlled stopping
• External reset capability for remote operation
• Thermistor motor protection evaluation

Performance Data & Power Ratings

• Standard Circuit Power: 110 kW at 400V
• Inside-Delta Circuit Power: 200 kW at 400V
• Current Ratings at Different Temperatures: 180A at 50°C, 156A at 60°C
• Inside-Delta Current: 352A at 40°C
• Minimum Load: 8% of full load current
• Power Consumption: 89W typical at rated current
• Continuous operation at 115% of rated current

Physical Specifications & Mounting

• Unit Dimensions: 210mm W × 230mm H × 298mm D
• Mounting Method: Screw fixation
• Mounting Flexibility: ±90° rotation and ±22.5° tilt
• Clearance Requirements: 100mm above, 5mm sides, 75mm below
• Maximum Cable Length: 500 meters

Electrical Connections & Terminals

• Main Circuit Connection: Busbar or screw terminals
• Control Circuit: Screw terminal connections
• Main Conductor Size: 70-240 mm² (front), 120-185 mm² (back)
• Auxiliary Contacts: 3 NO contacts and 1 changeover contact
• Auxiliary Wire Size: 0.5-2.5 mm² solid or stranded

Environmental Specifications & Durability

• Operating Temperature: Up to 60°C maximum
• Storage Temperature: -25°C to +80°C range
• Derating Starts: Above 40°C ambient temperature
• Maximum Altitude: 5000 meters above sea level
• Enclosure Protection: IP00 (requires external enclosure)
• Suitable for polluted environments degree 3

Shipping & Packaging Information

• Each unit comes in individual protective packaging
• Includes the complete 3RW4443-6BC44 soft starter unit
• International shipping via FedEx, UPS, and DHL available
• Secure packaging ensures safe delivery worldwide

Frequently Asked Questions

• What makes the inside-delta connection special? It doubles the motor power handling capability of the starter.
• Does this soft starter protect against motor overload? Yes, it includes comprehensive motor overload protection.
• Can I mount this unit in different orientations? Yes, it offers flexible mounting with rotation and tilt options.
• What is the integrated bypass feature? It reduces heat and saves energy after motor startup.

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