This kind of product is bitable. The contact state is maintainedby permanently magnet. Applying a pulse of current to coil canchange the state of contacts (either from on to off or from off toon). The energizing time may be less than 1 second. When the coilis reenergized, the contact of contactor will maintain the state ofon or off. Each product has two coils with two connecting means: 1.series coils, changing direction of current may realize on and off;2. one coil realizes pick, the other one realizes release in whichtwo-pole power supply is required. The latching series, integratedwith normally open contactor and normally closed one, provides morechoices for customers. This kind of product is suitable toprogramme-controlled power supply and continuous power system.