SIEMENS SIRIUS 3RW4038-1 arrancador suave, 37 kW, 72 A, 200-460 V AC, control 24 V AC/DC, bornes de tornillo 3RW40381BB04

Motor starting often causes mechanical stress and high inrush currents. The SIEMENS SIRIUS 3RW4038-1 soft starter reduces this by ramping up voltage, protecting both motor and driven equipment.

Who is it for

Maintenance engineers and panel builders who need reliable starting for three-phase motors up to 37 kW at 400 V. It suits pumps, fans, compressors, and conveyors where smooth acceleration matters.

Main features

• Rated power 37 kW at 400 V, 40 °C
• Rated operational current 72 A
• Main circuit voltage 200–460 V AC
• Control supply voltage 24 V AC/DC
• Integrated bypass contacts reduce heat during run
• Electronic overload protection built in
• Voltage ramp starting with adjustable ramp-up time 0–20 s
• Current limiting adjustable 150–700 % of Ie
• Screw terminals for main and control circuits
• Mounting on DIN rail or screw fixing
• Auxiliary contacts: 1 NO + 1 NC

Specifications

• Series: SIRIUS 3RW40
• Product type: Soft starter
• Number of phases: 3
• Size designation: S2
• Degree of protection: IP00
• Ambient operating temperature: -25 to +60 °C

Tips

For reliable operation, ensure the control voltage is stable and within 24 V AC/DC. The integrated bypass reduces energy consumption during continuous running.