What it is and what the rating means
The AF2650-30-22RT-70 is a three-pole contactor from ABB's AF series, rated for 2700 A in AC-1 duty (resistive load switching) with a dual-range coil accepting 100-250 VAC/DC. The AC-1 rating of 2700 A means it can switch resistive loads — heaters, lighting banks, furnace elements — at that full current continuously; for motor loads (AC-3 duty) the rating will be lower, typically around 60-70% of the AC-1 figure, so size it for the load type. The built-in 2 NO + 2 NC auxiliary contacts handle control-circuit feedback without an add-on block.