The 3RT1516-1GX20-0AA2: Rated operational current is 10 A at 24 V, with derated curves at higher voltages — 6 A at 230 V, 3 A at 400 V, 0.8 A at 440 V. That 10 A at 24 V is the headline number for most DC control circuits; the AC-1 maximum switching rate of 1 000 cycles per hour tells you it's fine for frequent cycling on resistive loads. The contactor carries a rated impulse withstand voltage of 6 kV on the main circuit, so it's suited for 400 V line-to-line panels without extra surge suppression on the load side. Auxiliary contacts are rated 9 A per NO and per NC, which is enough to drive a small PLC input or a pilot lamp directly. The coil draws 3.8 VA at 50 Hz, 21.6 to 31.9 V operating range — meaning it holds in reliably on a nominal 24 V supply with typical ripple. Dropout is clean: arcing time runs 10 to 15 ms, switching time 4 to 30 ms at AC.
The 45 mm width leaves room for a three-phase overload relay alongside in a standard 600 mm enclosure. Maximum operating altitude 2 000 m without derating. The surge suppressor design includes full-wave rectification, which is worth noting if you're paralleling with electronic controls that might be sensitive to DC coil suppression.