The AC-1 maximum switching frequency is 700 operations per hour — that's the resistive-load ceiling; for motor duty, AC-3 caps at 500 ops/h, and the punishing AC-4 (plugging/reversing) drops to 130 ops/h. If your application cycles a motor harder than that, the contactor will overheat the arc chamber. The auxiliary switch is present and carries 10 A at 24 V, 2 A at 48 V or 60 V, and 1 A at 110 V — these are the contact ratings for the built-in aux, not the main poles. If your PLC output drives a 24 VDC aux, verify the load stays under 10 A per contact. The coil pickup threshold is 0.8 x rated voltage, and dropout is 1.1 x rated voltage — meaning it holds in down to about 192 V on a 240 V nominal line, but drops out reliably at 264 V. That's a wide enough band to ride through a brownout without chattering.
Mounting is screw fixing — no DIN rail clip on this size S12 frame. Dimensions are 214 mm high, 160 mm wide, 225 mm deep — that's a substantial footprint. Plan for a 225 mm depth behind the panel door, and check that the 160 mm width doesn't crowd adjacent devices on the mounting plate. The single 11 mm mounting hole suggests a bolted-down installation, not a quick-release arrangement.