The Siemens SIRIUS 3RT1015-1AH01-ZX95 is a size S00 power contactor rated for switching motor loads up to 4 kW at 690 V and 3.5 kW at 500 V, with a 24 VDC coil drawing 10 A at 24 V. The S00 frame is the smallest in the SIRIUS contactor family, designed for compact control panels where space is tight — 45 mm wide, 57.5 mm tall, 72 mm deep.
The AC-2 rating at 400 V gives you 3 kW for slip-ring motor duty; the AC-4 rating at 400 V delivers 6.5 A for reversing or inching applications where the contactor makes and breaks stalled rotor current. For general motor starting (AC-3), the 690 V figure of 4 kW is the headline number — that's a 4-pole induction motor up to that power on a 690 V line. The 24 VDC coil pulls 10 A inrush, then holds at a lower sealed current; the coil operating range is 0.8 to 1.1 times rated voltage at 50 Hz, 0.85 to 1.1 at 60 Hz, so it stays pulled in through brownout conditions down to about 19.2 V.
The main power circuit uses screw-type terminals accepting 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) solid or stranded wire. For AWG, that's 2x (20 to 16), 2x (18 to 14), or 1x 12.