The Schneider Electric CV1BF0Z2FM521 is a TeSys B contactor — a 2-pole unit rated for 80 A in AC-3 duty at 690 V, with a 220 V AC 50 Hz coil. The AC-3 rating means it's sized for switching squirrel-cage motors up to that current; the AC-1 rating covers resistive loads like heating and lighting circuits.
The 690 V rated operational voltage covers most industrial three-phase systems up to that line-to-line level. The pole configuration is 2 NC (normally closed) on the power circuit, which is less common than NO for motor starting — typically used for applications like DC injection braking or load shedding where the circuit is closed at rest. The auxiliary contact block adds 2 NO + 1 NC, giving you feedback or interlocking signals without an add-on block.
The 2-pole body is narrower than a 3-pole unit, saving rail space in panels where only two poles of switching are needed — for instance, single-phase motor control or switching two phases of a three-phase load with a shared neutral.