3RW5517-1HA14, Soft Starter, 18.5 kW, 38 A, 200 to 480V AC

Siemens 3RW55 Soft Starter Series – Overview

Siemens 3RW55 soft starters are heavy-duty motor starting solutions designed for high-power industrial applications requiring robust and reliable control of three-phase asynchronous motors. The 3RW55 series focuses on reducing mechanical stress, limiting inrush current, and supporting very high motor power ratings with advanced motor protection and monitoring capabilities. With a rugged design and suitability for demanding operating conditions, Siemens 3RW55 soft starters are well suited for large pumps, compressors, crushers, conveyors, mills, and other heavy industrial machinery where dependable motor starting and long-term reliability are critical.

Product Description: 3RW5517-1HA14

The Siemens 3RW5517-1HA14 is a SIRIUS 3RW55 high-performance motor soft starter configured for supply voltages from 200 to 480 V AC and rated for a continuous operational current of 38 A (rated at 40 °C). At the standard three-phase 400 V class this model is specified for 18.5 kW motor power (18.5 kW at 400 V, standard circuit; lower ratings apply at higher ambient temperatures). The control supply for the unit is 110–250 V AC. This configuration makes the 3RW5517-1HA14 suitable for medium-power industrial motors such as large pumps, fans, moderate-size compressors and conveyors typically in the 11–30 kW bracket depending on wiring and ambient conditions — especially where reduced mechanical stress and controlled torque during starting are required.

Verified functional capabilities for this SKU include voltage-ramp soft starting and advanced torque control to optimize start characteristics under heavy-load conditions, plus combined braking and alternative run-down functions for process control. The unit supports condition monitoring and automatic parameterization to simplify commissioning and predictive maintenance. Analog output, programmable inputs/outputs and application wizards are available for local control and process integration. Communication modules are offered as plug-in options to connect via PROFINET, PROFIBUS or Modbus TCP for systems requiring fieldbus integration. The 3RW5517-1HA14 is specified with an IP00 enclosure rating for mounting inside suitably rated control cabinets.

Who should consider this model: procurement and engineering teams specifying a reliable motor soft starter for industrial motor starting where controlled torque, condition monitoring and fieldbus connectivity are required. Practical tip: verify motor nameplate kW and service factor against the starter’s rated power at the intended supply voltage and consider inside-delta wiring when higher motor power is needed within the same starter envelope.

Key Soft Starter Attributes