The 3RT2017-1UB41-1AA0 is a 3-pole SIRIUS 3RT power contactor rated AC-3e at 12 A, switching 5.5 kW at 400 V. The 1 NO auxiliary contact is built in, sized for control-circuit feedback to the PLC. This is the size S00 frame, the smallest in the SIRIUS 3RT family, designed for upright mounting. Screw terminals keep it compatible with standard ring or fork lugs — no special tooling needed on the panel floor.
The AC-3e rating (12 A) is the motor-switching duty that matters on a pump or conveyor — it's the current the contactor can break under full-load starting. If you're replacing a contactor on a 4 kW motor, this is the right class; if you're stepping up to 7.5 kW, you need the next frame up. The 24 V DC coil is common in PLC-controlled panels — just watch that the DC supply can deliver the inrush without droop. The integrated varistor clamps the coil's turn-off spike, which is good for the DC bus and the PLC output driving it. No extra suppressor to buy or mount.