Siemens 3RW4458-6BC44 High-Capacity Soft Starter for Heavy-Duty Motors

The Siemens 3RW4458-6BC44 delivers exceptional motor control for industrial applications requiring high power. This SIRIUS soft starter handles demanding three-phase motors with smooth acceleration and deceleration. Note this model represents a phased-out product with 3RW5 series serving as its modern successor.

Power Specifications & Current Ratings

• Standard Circuit Current: 970A at 40°C with 760A capacity at 60°C
• Inside-Delta Current: 1,680A at 40°C for high-power applications
• Motor Power Rating: 560kW standard, 1,000kW inside-delta configuration
• Operating Voltage Range: 200-460V AC with ±10% tolerance
• Insulation Voltage: 690V rated for enhanced electrical safety
• Power Consumption: 270W typical power loss during operation
• Frequency Operation: 50-60Hz with -10% to +10% tolerance range

Motor Control & Circuit Configuration

• Circuit Options: Standard and inside-delta connection capabilities
• Bypass System: Integrated contact system for efficient running mode
• Current Control: Adjustable current limitation for motor protection
• Minimum Load: 8% of motor current for proper operation
• Continuous Operation: 115% of rated current at 40°C ambient
• Brake Control: Motor brake output for controlled stopping
• Thermal Protection: Motor overload and thermistor monitoring

Physical Design & Installation Requirements

• Unit Dimensions: 510mm × 640mm × 290mm (W×H×D)
• Mounting Flexibility: ±90° rotation and ±22.5° tilt capability
• Clearance Space: 100mm above, 5mm sides, 75mm below required
• Main Connections: Busbar termination for power circuits
• Control Terminals: Screw-type connections for auxiliary circuits
• Cable Length: Maximum 500 meters for control wiring
• Installation Height: Suitable up to 5,000 meters above sea level

Wiring Specifications & Connection Details

• Main Conductors: 50-240mm² finely stranded or 70-240mm² stranded
• AWG Compatibility: 2/0 to 500 kcmil for international standards
• Auxiliary Wiring: 0.5-2.5mm² solid or 0.5-1.5mm² with ferrules
• Contact Configuration: 3 NO contacts and 1 changeover contact
• Pole Count: 3-pole design for three-phase motor control
• Terminal Security: Screw clamping for reliable connections
• Wire Preparation: Requires proper end processing for stranded wires

Environmental Specifications & Operating Conditions

• Operating Temperature: Maximum 60°C ambient temperature
• Storage Range: -25°C to +80°C for transportation and storage
• Derating Reference: 40°C standard temperature for ratings
• Protection Class: IP00 for installation in controlled environments
• Pollution Degree: Level 3 according to IEC 60947-4-2
• Environmental Category: 3K6, 3C3, 3S2, 3M6 for operational conditions
• Cooling Method: Natural convection without external fans

Control System & Monitoring Features

• Control Voltage: 230V AC for both 50Hz and 60Hz operation
• Display Interface: Fault signal display for diagnostic information
• Protection Functions: Intrinsic device and motor overload protection
• Reset Capability: External reset function for remote operation
• Parameter Adjustment: Multiple settings for different motor types
• Status Monitoring: Comprehensive operational state indication
• Safety Compliance: Meets international electrical standards

Packaging & Delivery Services

• One complete 3RW4458-6BC44 soft starter unit
• Installation manual and technical documentation included
• International express shipping via FedEx, UPS, and DHL
• Secure packaging ensuring component protection during transit
• Expedited processing available for time-sensitive projects

Frequently Asked Questions

• What is the modern replacement for this model?
• The 3RW5556-6HA14 serves as the preferred successor in the updated SIRIUS 3RW5 product line.
• How does inside-delta configuration increase capacity?
• This wiring method places the starter inside the motor winding delta, effectively handling higher currents.
• What environmental conditions suit this soft starter?
• The unit operates in category 3K6 environments without ice formation, condensation, or salt mist.
• Can I still get technical support for this phased-out product?
• Technical support remains available, though we recommend considering the newer 3RW5 series for future projects.
• What maintenance does the bypass contact system require?
• Regular inspection of contact surfaces and verification of proper mechanical operation ensures reliability.

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