The SENTRON 5TT5042-0 is an insta contactor with 2 normally-open and 2 normally-closed contacts, designed for switching loads on a 230 V AC control coil. It handles a rated voltage of 230 V AC and a maximum of 400 V, with a DC rated value of 220 V for the coil. The actuation voltage type is AC/DC, so it works with either supply.
The contact arrangement — 2 NO and 2 NC — is fixed; no field-convertible poles. That matters if your circuit needs a different break/make count. The coil pulls 4 W per pole in hot operating state, so factor that into your panel heat budget. The manufacturer notes you must provide spacers between units for heat dissipation — don't pack them tight on the DIN rail without air gaps. At 3 modular width units (53.5 mm wide, 71 mm deep, 90 mm tall), it fits standard 18 mm-per-module DIN-rail spacing. The installation depth is 64 mm behind the panel face, so check your enclosure depth if you're retrofitting into a shallow box. The coil accepts AC or DC; rated coil voltage is 230 V AC, at DC it is rated 220 V.