The compact construction of the contactor is stereoscopes arrangement with double-breaking contacts. In its magnetic system ,the core is in form of letter "E" and the free floating magnet assembly produces cushioning effect. The contactors has 3 pairs of NO main contacts.The quantity of auxiliary contacts: When Ie <38A is 2NO+2NC at most. When Ie >45A is 4NO+4NC at most. Arc control device of the contactor : When Ie <22A , there is no arc extinguishing cover but arc separation block ...When Ie >32A , the metal grid plate is mounted in a plastic arc chute Screw terminals adopt new type bolt with tile-shaped washer for easy operating and installation , and so as to save winning time and labor costs Installation of all series of contactors is suitable for bolting . When Ie<38A the contactors can also be mounted quidkly on a 35mm standard mounting rail .This will save much time and labor costs.