The A9-22-00-81 is a 4-pole IEC contactor from the A-Line Series, rated 21 A with a 24 V AC coil. The contact configuration is 2 N.O. and 2 N.C., which suits applications needing both normally-open and normally-closed main poles — for example, reversing or two-speed motor starters where one set breaks before the other makes.
The 24 V AC coil is standard for legacy control transformers; verify the coil pickup and dropout voltage against your control circuit's sag under load. The 21 A rating covers motor loads up to roughly 5.5 kW at 400 V AC-3, though the actual motor FLA must be checked against the contactor's utilization category.