3RW4037-1BB14, Soft Starter, 30 kW, 63 A, 200 to 480V AC

Siemens 3RW40 Soft Starter Series – Overview

Siemens 3RW40 soft starters are advanced compact motor starting solutions designed for smooth starting and stopping of three-phase asynchronous motors in industrial applications. The 3RW40 series focuses on reducing mechanical stress, limiting inrush current, and providing enhanced motor protection compared to basic soft starters. With integrated bypass functionality and flexible configuration options, Siemens 3RW40 soft starters are well suited for pumps, fans, compressors, conveyors, and general industrial machinery requiring reliable and efficient motor starting.

Product Description: 3RW4037-1BB14

The Siemens 3RW4037-1BB14 is a SIRIUS 3RW40 soft starter (S2 size) specified for continuous operation up to 63 A (rated at 40 °C) and rated to start motors up to 30 kW at 400 V (18.5 kW at 230 V, both at 40 °C). It supports a wide mains supply range of 200–480 V AC and uses a separate control supply of 110–230 V AC/DC for control circuitry. Typical motor compatibility covers three-phase asynchronous motors in the 18.5–30 kW band depending on system voltage and ambient conditions; derating applies at higher ambient temperatures (for example rated current falls to 58 A at 50 °C and 53 A at 60 °C). This model is suited to industrial motor starting tasks such as pumps, fans, compressors and conveyors where reduced mechanical stress, current limiting and overload protection are required. Standout, verified features for the 3RW4037-1BB14 include an integrated bypass contact system to reduce heat dissipation during run, thyristor-based control with adjustable current limitation, intrinsic device protection and built-in motor overload protection — all of which help reduce inrush currents and provide basic motor protection without additional external starters.

Key Soft Starter Attributes