The Siemens SIRIUS 3RT2636-1AP03 is a capacitor contactor in the S2 frame size, built for switching capacitive loads — think power-factor correction banks where the inrush current from charging capacitors would weld standard contactor contacts shut. It's rated to switch 6 A at 230 V AC and 3 A at 400 V AC, with a maximum operating rate of 100 switching cycles per hour at those voltages. The coil is 230 V AC, terminated via screw-type terminals.
The 114 x 65 x 130 mm footprint (height x width x depth) fits a standard panel layout. This isn't delicate panel gear; it's built for the pit, shrugs off the vibration you get on a crusher floor.
Solid conductors: accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². Stranded conductors: 2x (10 to 35 mm²) or 1x (10 to 50 mm²). The auxiliary contact block is attachable (one slot). Arcing time is 10 to 20 ms; operate time at AC is 10 to 18 ms.