Description
Siemens 3RW40381BB04 Soft Starter Overview
The Siemens 3RW40381BB04 is a Size S2 electronic soft starter engineered to deliver smooth, controlled motor starting and stopping for three-phase AC motors. By gradually ramping up voltage at startup, it dramatically reduces mechanical stress on driven equipment and limits inrush current spikes on the electrical supply — extending motor and load service life while protecting upstream electrical infrastructure.
Key Specifications
- SKU / Part Number: 3RW40381BB04
- Brand: Siemens
- Frame Size: S2
- Rated Motor Current: 72 A
- Rated Motor Power: 37 kW (at 400V)
- Supply Voltage: 400V AC
- Device Type: Electronic Soft Starter (3RW40 Series)
Features & Benefits
- Smooth voltage ramp-up reduces mechanical shock and torque spikes at motor start
- Limits inrush current to protect electrical systems and reduce demand charges
- Integrated motor protection functions for reliable, safe operation
- Compact S2 frame size for space-efficient panel installation
- Part of the proven Siemens 3RW40 soft starter family, widely used in HVAC, pumping, fan, and compressor applications
- Simplifies commissioning with straightforward parameter settings
- Reduces wear on mechanical couplings, belts, and driven components
Typical Applications
- HVAC fans and blowers
- Pumps and compressors
- Conveyor and material handling systems
- Industrial machinery requiring controlled acceleration
Why Choose the Siemens 3RW40 Series
The Siemens 3RW40 series soft starters are recognized for their reliability, ease of installation, and robust motor protection capabilities. The 3RW40381BB04 is an ideal solution for facilities looking to extend equipment life, reduce energy demand at startup, and minimize maintenance costs associated with hard-start motor applications.
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