Generally speaking, two-way switch controls one light from two locations: for example, the long hallway could have a switch at each end to control one hall light. Or a large family room that has two entrances could have a switch at both entrances to operate one overhead light. A two-way switch allows you to turn on the light conveniently when you enter an area rather than stumble through the dark to find the switch.
Now we are going to talk about the difference between traditional two-way light switch and new electrical touch two-way switch. First of all, let’s see what are traditional two-way switch and new touch two-way switch.
Traditional two-way switch has a single pole double throw configuration (SPDT). Each has a common terminal (COM) with a pole that can be switched between position L1 or L2. As diagram below shows, the live wire is connected to Switch1, and flow to the lamp through L1 and Switch2. The other side of the load is then connected to neutral wire. When both Switch1 and Switch2 are at ON position, the lamp will be ON (see the picture on the left). If Switches1 or Switch2 is at OFF position, the lamp will be OFF (see the picture on the right).
As diagram below shows, new electrical touch two-way switch has four terminals respectively for light (L1), live wire, neutral wire and communication line A. When wiring the switch, both two switches must be connected with live wire and neutral wire. Communication line A must be connected between two switches; so the operational information of one switch can be transmitted to another switch. The output of any one switch should be connected to the light. Touch softly the icon on any one switch surface, the light will be ON; touch again the icon on any one switch surface, the light will be OFF. (See picture below)
So what are the differences between traditional two-way switch and new electrical touch two-way switch? Using traditional two-way switch, switches should be connected with live wire. While for new touch two-way switch, switches must be connected with both live wire and neutral wire. And communication line A must be connected between two switches. Traditional switch controls only one light; new switch can control one light, or two lights, or more lights as well. (See diagram below) Easy to bad contact, high failure rate and inconvenient to use are the main defects of traditional switch. However, new switch is characterized by non-contact, weak-current control and maintenance free. Besides, it is a silent switch, free from noise pollution and environment-friendly. As a result, new switch is better than the traditional one.