1. From the appearance, each key of single control switch can be connected with two lines, while each key of double control switch can be connected with three lines;

2. In terms of price, single control switch and double control switch with the same number of keys will cost more than single control switch.

3, single switch panel: a light, as long as you use a switch, control in one place, then this switch, you can use single switch: switch panel as a lamp, not only do you want to in this place can control, also want to control in another place, for example, you want a switch is installed in place of the door in the bedroom can control the lamp, also want to sleep in your side of the head of a bed with a switch, also can control the lamp, it becomes both switch panel to control the lamp at the same time, that this time, you will use double switch, with a single control switch panel, it can't reach your goal

4. From the perspective of function, the single control switch panel can be replaced by the double control switch panel. It has the function of the single control switch, but the single control switch cannot replace the double control switch.So when buying, if there is an individual switch can not figure out whether to buy a double control switch or single control switch, the direct purchase control switch on the line, save the trouble of running again;

Control method: connect the two contacts of two single-pole and double-throw switches respectively, that is, the contact 1 of switch 1 is connected to the contact 1 of switch 2, the contact 2 of switch 1 is connected to the contact 2 of switch 2, and then the two switch knives are connected to both ends of the light as the whole switch.In this way, when the knives of switch 1 and 2 are connected to contact 1 or contact 2 at the same time, the circuit is connected and the light is on.

Extended information:

Double control switch is a switch with a normal open, normally closed two contacts (that is, a pair).Usually with two double control switch control a light or other electrical appliances, meaning that there can be two switches to control the lights and other electrical switches, for example, in the downstairs to open the switch, to the upstairs after the switch off.If it is a traditional switch, you want to turn off the light, you have to run down the stairs to turn off, using a double control switch, you can avoid this trouble.

1. Whether the material of double control switch is qualified.Good face plate USES project plastic, hardness, toughness and smooth degree are better, service life is in 10 years of above.

2. Conductor material of double control switch panel.Good switch panel conductor is tin-phosphorus bronze, which has many advantages such as good electrical conductivity, good elasticity, good fatigue resistance, good oxidation resistance and so on.

3, double control switch key quality.Good button sound crisp, stable and accurate feel, closure times in more than 50,000 times.

4. Double control switch indication.Can choose the switch that takes fluorescent indication, facilitate night to identify