The 3RT1054-1AP36: Rated switching frequencies tell the duty story: AC-3 (motor start) up to 1 000 operations per hour, AC-4 (plugging/inching) limited to 130 /h — that reflects the harsher arc extinction on every break. AC-1 resistive loads can run at 800 /h. Keep the AC-4 count low or the contactor ages fast.
Wiring: main circuit power terminals accept stranded cable 16 mm² to 70 mm², or solid up to 4 mm² on the auxiliary terminal. Auxiliary contacts accept 2× (0.5–1.5 mm²) or 2× (0.75–2.5 mm²), max 2× (0.75–4 mm²). Strip length for auxiliary terminals depends on ferrule — typical 8 mm for spring but this is screw, so aim for 7 mm. Mount with vertical surface, screw fix; leave 10 mm above/below and 20 mm forward for arc extinguishing. Coil pick-up and drop-out times are symmetrical at 40–60 ms both AC and DC — fast enough for most interlocking but not for precision synchronisation.