The Siemens 3RT2015-2FB41-ZX95 is a 3-pole contactor from the SIRIUS series, size S00, with spring-loaded terminals and a DC 24 V coil that includes an integrated suppression diode. Its AC-3 rating of 3 kW at 400 V means it is sized for switching three-phase induction motors up to that load — the duty class that governs real motor starting, not the higher AC-1 resistive rating. The integrated diode handles the coil's flyback voltage, so you can omit an external free-wheel diode on the panel wiring.
Size S00 is the smallest SIRIUS frame — it snaps onto a DIN rail and fits tightly in high-density panels. The spring-loaded terminals accept 0.2–2.5 mm² solid or ferruled stranded wire; strip length is typically 8–10 mm. The DC 24 V coil draws about 0.2 A steady-state, so a standard 24 VDC power supply with a few hundred mA headroom per contactor is sufficient. The integrated diode means no separate snubber is needed across the coil terminals.