The Siemens 3RT2636-1AN23 is a SIRIUS capacitor contactor in frame size S2, designed for switching capacitive loads in power-factor correction banks.
The auxiliary contact block on this contactor is rated for 6 A at 24 V AC, 6 A at 230 V AC, and 3 A at 400 V AC — these are the making/breaking capacities for control or signalling circuits. The maximum switching frequency at 230 V and 400 V is 100 operations per hour, dropping to 30 per hour at 690 V — this governs how often the contactor can cycle a capacitor bank without exceeding thermal limits.
Solid conductors: accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². Stranded conductors: accepts 2x (10 to 35 mm²) or 1x (10 to 50 mm²). This covers both control-circuit wiring and power-side connections for capacitor banks up to the contactor's rated duty.