Siemens 3RW4073-2BB44 SIRIUS soft starter S12

1. General Information

• Product Brand: SIRIUS

• Model: 3RW4073-2BB44

• Type: Soft Starter

• Key Features:

  • Integrated bypass contact system

  • Thyristor-based control

  • Intrinsic device protection

  • Motor overload protection (adjustable current limitation)

  • External reset capability

2. Electrical Specifications

Power Electronics

• Rated Operational Current:

  • 230 A @ 40°C

  • 205 A @ 50°C

  • 180 A @ 60°C

• Mechanical Output for 3-Phase Motors:

  • At 230 V: 75,000 W (75 kW) @ 40°C

  • At 400 V: 132,000 W (132 kW) @ 40°C

  • At 200/208 V: 60 hp @ 50°C

  • At 460/480 V: 75 hp @ 50°C

• Operating Voltage Range: 200–460 V AC (±15% tolerance)

• Operating Frequency: 50–60 Hz (±10% tolerance)

• Insulation Voltage: 600 V

• Power Loss: 90 W (typical @ 40°C)

Control Circuit

• Control Supply Voltage: 230 V AC (50/60 Hz)

• Tolerance:

  • Voltage: -15% to +10%

  • Frequency: ±10%

3. Mechanical Specifications

• Dimensions:

  • Width: 160 mm

  • Height: 230 mm

  • Depth: 278 mm

• Mounting:

  • Screw fixing

  • Orientation:

    • With fan: Vertical mounting surface (±90° rotatable, ±22.5° tiltable)

    • Without fan: Vertical mounting surface (±10° rotatable/tiltable)

• Required Clearance:

  • Above: 100 mm

  • Sides: 5 mm

  • Below: 75 mm

Terminal Connections

• Main Circuit:

  • Busbar connection

  • Conductor Cross-Section:

    • Fine-stranded (with/without core end): 70–240 mm²

    • Stranded: 95–300 mm²

    • AWG cables: 2/0–500 kcmil

• Auxiliary/Control Circuits:

  • Spring-loaded terminals

  • Conductor Cross-Section:

    • Solid/Fine-stranded: 0.25–1.5 mm²

4. Environmental Conditions

• Operating Temperature: -25°C to +60°C

• Storage Temperature: -40°C to +80°C

• Installation Altitude: Up to 2000 m

• Protection Rating:

  • IP00 (front)

  • IP20 (with cover)

• Environmental Compliance:

  • Operation: IEC 60721-3K6 (no ice/condensation, no salt mist)

  • Transport/Storage: IEC 60721-2K2/1K6 (limited condensation, no sand ingress)

5. Certifications & Approvals

• Standards Compliance:

  • IEC/EN 60947-4-2

  • UL/CSA Listed

• Key Certificates:

  • CE Declaration of Conformity

  • Lloyd’s Register (Marine)

6. Additional Features

• Auxiliary Contacts:

  • 2 NO (Normally Open)

  • 1 CO (Changeover)

• Display: Red LED for fault indication

• Simulation Tools: Siemens STS (Soft Starter Simulation Tool)