1. the principle of features:

Keep type electromagnet is commonly used in some low consumption of products, because the products just give a moment electricity, can achieve back into action, and in the position of back to hold when the power is cut off, its a good variety of electricity way, control the action of the extended or retracted, according to the number of the wire, some two wires, or three lines,

2. the current action method:

Two lines of products: if be a red line, a black line, when the red line to connect power positive anode, the black line to connect power product action lever out of action, when the red line to connect power negative, black line connect the anode, the action bar back.

Three lines of products: if be a red line, a black, a white line, which is suitable for public line, white line when the white line by positive power cathode connected to the red line, product action bar, when power negative electrode connected to the black thread, single electromagnet action bar back.