The mailing and visitors' address for ABB's head office is:
Tel. +41 (0)43 317 7111
Fax +41 (0)43 317 4420
ABB's Headquarters are located in Oerlikon, in the outskirts of Zurich, Switzerland, mid way between the city center and the airport.
Fly into Zurich International Airport, from there take a train to Zurich Oerlikon (7 min) or a taxi (10 min)
For long distance traffic, go to Zurich Hauptbahnhof (main station), then take train to Zurich - Oerlikon (5 min)
To find your route, follow the link above