The ABB A9-30-10-42 is a 3-pole contactor from the A9 series, rated for coil control at 277 V 60 Hz and 230–240 V 50 Hz. This is a panel-mount component for switching motor or resistive loads in industrial control cabinets.
The coil rating is 277 V 60 Hz and 230–240 V 50 Hz. Verify control transformer taps match these voltages before wiring.
