Here you will find a vast assortment of contactors,with version three-pole and quatripolare, available with two coils in ac and dc. Also available specific versions for: - interruption of dc loads.I can give you to espempio: if you have a machine to work quatripolare but you have at your disposal a contactor tripolar, you just need to add an auxiliary contact to transform it into quatripolare, of course, the contactor must be of the brand and the same model.