The Schneider LC3D09AU7 is a TeSys D star delta starter — a pre-wired assembly that reduces inrush current during motor startup by connecting the windings in star, then switching to delta for running. It carries 3 x 3P (3 NO) power poles and is rated 9 A in AC-3 utilisation category, which is the standard duty for squirrel-cage motor switching. The 240 V AC coil is sized for common control voltages in industrial panels. IP20 front-face protection means the terminals are finger-safe once the panel door is closed, but the unit itself is not sealed against washdown — it belongs inside an enclosure.
Rated for operation from -40 to 70 °C, storage from -60 to 80 °C, and altitude up to 3000 m without derating. Climatic withstand conforms to IACS and IEC 60947-1 Annex Q category D, covering damp-heat and salt-mist environments common in marine and coastal installations.
Vibration and Shock Tolerance
Mechanical robustness is specified for vibration: 2 Gn contactor open, 4 Gn contactor closed, both over 5–300 Hz. Shock tolerance is 10 Gn open, 15 Gn closed for 11 ms.