The Siemens 3RT2023-1BB40-Z W97 is a 3-pole power contactor from the SIRIUS 3RT2 series, rated for AC-3e/AC-3 duty at 9 A and 4 kW at 400 V. The 24 V DC coil is a common control voltage for PLC-driven panels; the 1 NO + 1 NC auxiliary contact block is built in, saving a rail slot for additional auxiliaries.
The screw terminals accept up to 4 mm² conductors, typical for motor branch circuits up to 4 kW. Multi-unit packaging (12 pieces per pack) suggests it's ordered as a line-item spare or for building multiple identical starter assemblies.