Ratings and fit
The 3RT2017-1AB02-Z X95 is a 3-pole power contactor from the Siemens SIRIUS family, rated AC-3e/AC-3 at 12 A with a motor-switching capacity of 5.5 kW at 400 V. The 24 V AC coil (50/60 Hz) is common for control transformers in panel builds; verify your control voltage matches, as this is not a DC coil. Size S00 means it occupies a compact DIN-rail footprint — roughly 45 mm wide — so it fits in crowded panels where space is tight. Terminals are screw-type, which is still the standard for many panel shops that prefer screw clamps over spring-cage for higher-current power wiring.