Siemens 6SE9523-7DH40 Sirius Soft Starter Module

Siemens 6SE9523-7DH40 midimaster eco soft starter module provides controlled motor starting for three-phase motors by gradually ramping voltage to limit inrush current and reduce mechanical stress. Designed for unfiltered 3-phase input from 380–500 V AC at 47–63 Hz, it delivers a nominal output of 18.5 kW and is built for indoor control panels with a compact footprint. The enclosure measures 550 × 275 × 210 mm (H × W × D), carries IP21 protection, and supports an operating ambient temperature range of 0 to +40°C with a voltage tolerance of ±10%. This model represents Siemens’ mid-range soft-start solution, offering a balance of performance and space efficiency for medium to high-power motor starts where precise start-up characteristics are important.