3RW5235-6AC14, Soft Starter, 75 kW, 143 A, 200 to 480V AC

Siemens 3RW52 Soft Starter Series – Overview

Siemens 3RW52 soft starters are high-performance motor starting solutions designed for demanding industrial applications requiring precise and reliable control of three-phase asynchronous motors. The 3RW52 series focuses on reducing mechanical stress, limiting inrush current, and supporting higher motor power ratings with advanced protection functions compared to compact soft starters. With robust construction and enhanced motor protection capabilities, Siemens 3RW52 soft starters are well suited for heavy-duty applications such as large pumps, compressors, conveyors, mixers, and industrial process machinery where dependable motor starting and operational reliability are critical.

Product Description: 3RW5235-6AC14

The Siemens 3RW5235-6AC14 is a SIRIUS 3RW52 soft starter rated for 143 A and specified for 75 kW motors at 400 V. Designed for supply voltages from 200 V to 480 V AC, this unit handles medium‑to‑large three‑phase asynchronous motors commonly found in industrial pump, conveyor and compressor applications. The device offers standard soft‑starting functions (ramp-up and ramp-down) with adjustable current limitation and soft torque control to reduce mechanical stress and limit inrush currents during start/stop cycles. This SKU includes an analog output and screw terminal connections for control wiring and is compatible with Siemens HMI and communication modules for PROFINET, PROFIBUS, Modbus TCP/RTU and Ethernet/IP (via optional communication modules). Built-in motor protection features include overload detection and evaluation of thermistor (PTC) inputs to support external temperature-based motor protection. The 3RW5235-6AC14 is supplied in an IP00 enclosure and is intended for panel or cabinet mounting where coordinated protection and optional communication are required.

Key Soft Starter Attributes