The Siemens SENTRON 5TT5840-0 is an Insta contactor with four normally open contacts, designed for switching loads on 230 V AC control circuits. It carries a maximum voltage rating of 440 V and a rated operating voltage of 230 V AC. The contact arrangement — 4 NO, 0 NC — means it makes four independent circuits when the coil is energized, with no break contacts in the package.
The switching capacity of 4000 W for incandescent lamp load tells you this contactor is sized for resistive lighting banks, not motor or inductive loads — the tungsten inrush can be 10–15× steady-state, and the 4 NO contacts handle that without welding. At 3 modular width units (54 mm wide, 71 mm deep, 90 mm tall), this occupies three standard 18 mm DIN-rail slots. The IP20 protection class means it's suitable for dry indoor panels only — no washdown, no dust-laden environments. The 230 V AC coil is line-voltage control; verify your control transformer or PLC relay output can source the coil inrush before committing the BOM line.