The use and understanding of double contact switch

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It is often heard that the double-contact switch is the kind of wall switch we usually see in the bedroom. That is the double contact. This type of switch is designed for single lamp dual control. It is possible to switch here or switch there.
The reason for this switch is for convenience. You think, if you don't have such a switch, do you have trouble getting into the door and touching the wall, then going down to the bed and then going down again, then touching the wall and going back?
This switch requires two combinations to achieve the effect of single lamp dual control.
It can be seen by the number of terminals on the switch whether it is a dual control switch. If it is 3, 6, 9, or 12, it is dual control. If it is 2, 4, 6, or 8, it is single-control.
The number of control lights is not the switch is working. Instead, there is a component inside the fixture. Call the segmenter. The segmenter controls the number of light bulbs that are illuminated based on the number of times the switch is turned on. Commonly used are 2 lines 3 segments and 3 lines 4 segments. Advanced will add remote control.
Ordinary voice-activated switches are connected in series in the circuit. When the switch is working, there will always be current in the circuit, although the current is not large.
However, this type of switch has a load requirement. The load must be an incandescent bulb. Energy-saving lamps, which are now very common in applications, are beyond control. Even if you can control it, the usage time will not be very long. The more common phenomenon is that the voice-activated switch is easily damaged. Serious damage can result in simultaneous damage to the switch and load.
A two-contact switch is a relay that is internally used as a two-contact relay. This switching element can effectively isolate the mains and load. Especially when it is applied in the energy-saving lamp circuit, it can also resolutely avoid the phenomenon that the energy-saving lamp strops after being turned off at night. However, there is a disadvantage that the front and rear wiring must be complete with the hot wire and the zero wire. Otherwise the circuit will not work.
The double-contact switch I mentioned is the relay used in the internal switching element. The relay is a small current to control large currents. Small currents are generated by internal circuitry. The large current is the load current. Why can't I work on a single line? Because the power required by the relay is much greater than the driving power of the thyristor. Also, the circuit does not allow any current to flow in the load circuit. So use a fully isolated relay. With dual-contact relays, the load and mains can be completely isolated, in addition to being completely isolated. This avoids the strobe of the energy-saving lamp. It is ok to work on a single line. Unless the bulb is dedicated.
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