The ABB B 75 is a three-pole contactor rated for (690 V) 40 kW switching capacity, with a coil that pulls in on 48-55 V AC at 50/60 Hz. That power rating is the AC-3 motor-switching figure — the one that matters for sizing against a motor load, not the resistive AC-1 number. The 1000 V rated insulation voltage gives headroom for 690 V line-to-line systems without derating the main poles.
Integration Notes
The B 75 occupies an 82 x 108 x 110 mm footprint — a standard contactor envelope for this power class, suitable for DIN-rail or panel-mount integration. The three NO main contacts handle the power circuit; the built-in auxiliary stack gives one NO and one NC for feedback or interlocking without an add-on block. Coil draws on a 48-55 V AC control supply, common in older European panel designs running on 50/60 Hz control transformers.