The ABB A26-30-10 is a three-pole contactor from the A26 series, carrying 3 normally-open main contacts and a dual-frequency coil rated 220-230V at 50 Hz or 230-240V at 60 Hz. Rated operational voltage is 690 V, with an impulse withstand voltage of 8 kV — figures that place it in standard 400/690 V industrial control panels switching motor or resistive loads within its current class.
The 8 kV rated impulse withstand voltage (Uimp) tells you the contactor's insulation coordination meets the 400/690 V distribution level — it clears the 2.5 kV and 4 kV thresholds common in IEC 60947-4-1 testing, meaning it handles switching surges on a motor circuit without flashover. The 690 V rated operational voltage (Ue) covers 400 V three-phase networks with headroom; if your line runs 480 V or 575 V, this contactor is within its design envelope.