The Eaton A40-30-10-51 is a 3-pole, non-reversing across-the-line contactor rated for 60 A, with a 480 V 60 Hz / 400-415 V 50 Hz coil and one normally open auxiliary contact. It's a direct-on-line switch for motor loads — think conveyors, pumps, fans — where forward-only starting is all the circuit needs.
This part carries an EOL_HOT lifecycle status, meaning Eaton has formally ended production. There is no listed successor order code in the record.
The 60 A rating governs the motor full-load current it can switch in AC-3 duty (typical induction motor starting). The 480 V 60 Hz / 400-415 V 50 Hz coil means it pulls in reliably on those line voltages; if your control transformer feeds a different voltage, the coil won't hold.