Siemens 3RW4455-6BC44 High-Performance Soft Starter for Industrial Motors

The Siemens 3RW4455-6BC44 provides smooth motor control for demanding industrial applications. This SIRIUS series soft starter handles high-power three-phase motors with exceptional reliability. Its advanced features protect equipment while ensuring optimal motor performance.

Electrical Specifications & Power Ratings

• Rated Operating Current: 693A at 40°C with derating to 551A at 60°C
• Motor Power Capacity: 400kW standard circuit, 710kW inside-delta configuration
• Operating Voltage: 200-460V AC with ±10% voltage tolerance
• Frequency Range: 50-60Hz operation with -10% to +10% frequency tolerance
• Control Supply: 230V AC with screw terminal connections
• Current Limiting: Adjustable current limitation for motor protection
• Power Loss: 220W typical during operation at 40°C ambient temperature

Motor Control & Protection Features

• Starting Method: Soft start and soft stop functionality for smooth operation
• Motor Protection: Integrated overload protection with thermal monitoring
• Circuit Options: Standard and inside-delta circuit configurations available
• Bypass Contact: Integrated bridging contact system for efficient running
• Minimum Load: 8% of motor current for proper operation detection
• Reset Capability: External reset function for remote operation
• Braking Support: Engine brake outlet for controlled stopping

Physical Dimensions & Installation Data

• Unit Dimensions: 510mm × 640mm × 290mm (W×H×D)
• Mounting Type: Screw fixing with flexible mounting positions
• Clearance Requirements: 100mm above, 5mm sides, 75mm below
• Main Connections: Busbar connection for power circuits
• Auxiliary Contacts: 3 NO contacts and 1 changeover contact
• Cable Support: Maximum 500 meter cable length capability
• Installation Height: Up to 5,000 meters above sea level

Connection Specifications & Wiring

• Main Conductor Size: 50-240mm² finely stranded or 70-240mm² stranded
• AWG Compatibility: 2/0 to 500 kcmil for North American standards
• Auxiliary Wiring: 0.5-2.5mm² solid or 0.5-1.5mm² stranded with ferrules
• Terminal Type: Screw terminals for control and auxiliary circuits
• Pole Configuration: 3-pole design for three-phase systems
• Connection Security: Torque-controlled screw connections
• Wire Preparation: Requires proper conductor end processing

Environmental Specifications & Durability

• Operating Temperature: Up to 60°C maximum ambient temperature
• Storage Temperature: -25°C to +80°C for transportation and warehousing
• Derating Point: 40°C standard reference temperature
• Protection Class: IP00 for controlled environments
• Humidity Resistance: Standard industrial humidity levels
• Vibration Tolerance: Suitable for normal industrial vibration
• Cooling Method: Natural convection cooling design

Advanced Control & Monitoring

• Display System: Fault signal display for diagnostic information
• Thermal Monitoring: Motor thermal protection with resistor evaluation
• Parameter Adjustment: Multiple setting options for different applications
• Status Indication: Visual indicators for operational states
• Communication Ready: Preparation for system integration
• Testing Capability: Built-in functions for commissioning tests
• Diagnostic Features: Comprehensive fault detection and reporting

Packaging & Delivery Information

• One complete 3RW4455-6BC44 soft starter unit
• Installation manual and technical documentation included
• Global express shipping via FedEx, UPS, and DHL services
• Professional packaging ensuring complete component protection
• Quick order processing with priority handling available

Frequently Asked Questions

• What motor sizes can this soft starter handle?
• This unit controls motors up to 400kW in standard configuration and 710kW in inside-delta mode.
• How does the inside-delta configuration work?
• The inside-delta connection places the soft starter inside the motor winding delta for higher power handling.
• What protection features does this model include?
• It provides motor overload protection, thermal monitoring, and current limitation for comprehensive equipment safety.
• Can I use this starter with existing motor control circuits?
• Yes, the standard screw terminals and busbar connections integrate with most industrial control systems.
• What maintenance does the bypass contact system require?
• The integrated bridging contacts need periodic inspection for wear and proper contact pressure maintenance.

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