Being used in an AC 50-60 Hz electric power system with different rated working voltage up to 1140V and rated current up to 1600A, the low voltage vacuum contactor is suitable for frequently operated civilian-using electric application, industrial single phase electric applications, electromagnetic starter and anti-exploding magnetic starter. This series adopts before-and-after layout between the main circuit and controlling circuit, electrical latch or machanical latch and vacuum interrupter with ceramic shell.