SIRIUS soft starter S2 72 A-3RW4038-1TB04

Product Description

SIRIUS Soft Starter S2 72 A – 3RW4038-1TB04

The Siemens 3RW4038-1TB04 is a compact and high-performance SIRIUS soft starter from the 3RW40 series, designed for smooth starting and stopping of three-phase induction motors up to 37 kW (400 V). It minimizes starting current, torque shocks, and mechanical stress, helping improve motor lifespan and system reliability in demanding industrial applications.

This model belongs to the S2 frame size and features 24 V AC/DC control voltage, making it suitable for modern automation and PLC-based control systems. It is widely used in pumps, fans, compressors, conveyors, HVAC systems, and process machinery, where controlled motor acceleration and deceleration are essential.

The 3RW40 series includes an integrated bypass contact system, adjustable current limiting, and built-in motor protection, ensuring energy-efficient and maintenance-friendly motor control.

🔹 Key Features

• Siemens SIRIUS 3RW40 series soft starter
• Part Number: 3RW4038-1TB04
• Frame size: S2
• Rated current: 72 A
• Motor power: 37 kW at 400 V
• Supply voltage: 200–480 V AC, 3-phase
• Control voltage: 24 V AC/DC
• Soft start and soft stop functionality
• Integrated bypass contacts for reduced heat generation
• Adjustable ramp-up and ramp-down times
• Built-in motor overload protection
• Adjustable current limiting function
• Screw terminal connections for secure wiring
• Compact design for panel space optimization
• DIN rail / panel mounting support
• Complies with IEC 60947-4-2 standards