B series AC Contactor,mainly used in 50/60Hz electrical lines of the rated voltage up to the 660V AC.And of the rated current up to 475A, are applicable for remote making and breaking of frequent control of AC motors,having no-voltae protection.Usually,it can be combined with T series thermal relay to form a electromagnetic starters which have overload and open-phase protection.The products conform with the standards IEC947、VDE0660、NFC63-110、NBNC63158、NE1173BS5424、EN50012.