The Siemens SIRIUS 3RT1015-1AR21 is a size S00 power contactor with a 24 VDC coil, screw-type terminals for the main circuit, and a 45 mm width that snaps onto a 35 mm DIN rail per EN 50022. Rated for AC-3 motor switching at 400 V, it handles a 3 kW load at AC-2 and 6.5 A at AC-4, so it's sized for small induction motors on pumps, fans, or conveyors — not for heavy jogging duty where AC-4 current would dominate. The auxiliary contact block carries 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — enough for a PLC input or a small pilot light, but watch the voltage drop if you're driving a long signal line.
Snap-on mounting onto 35 mm DIN rail per EN 50022; the 45 mm width and 57.5 mm height leave room for a three-phase busbar or an adjacent overload relay in a standard distribution board.