Single-open and dual-control is one of the electrical switch control methods, which can be divided into single-open and single-control, single-open and dual-control, and double-open and dual-control. The single-pole double-throw switch has two functions: one is to control the power output to two devices respectively. The second is that one device can be controlled for different output forms.

There is a saying: single pole double control, single pole double throw;

Single-opening and double-opening, three-opening means that there are several switches on a switch panel.

Single control, dual control means that a circuit has several switch control.

Single-on and dual-control: There is a switch button on each of the two control panels, and the two switch buttons control a circuit at the same time. For example, the lights installed on the stairs can be turned on or off on the stairs, and can also be turned on or off under the stairs.

Single-open and dual-control are literally, there is a switch, both sides are controlled. Example: For example, you have to turn on the light before entering the bedroom, and then turn off the light at the bedside. This requires the use of single-on and dual-control. The light can be turned on and off in two places.