After the power supply enters the electric box, first connect the main switch, and then connect two sub switches after the main switch comes out. One of them is separately connected to the refrigerator, freezer and other electrical equipment that do not need to be powered off, and the other is separately connected to the electrical circuit that needs to be powered off by one button (such as kitchen, bedroom, toilet, etc.).
The wiring of the distribution box is shown in the figure (the ground wire is not drawn here):
Usually at home, all switches are closed; If you need to go out for a long distance, turn off the one button power-off main switch. If the whole family line needs maintenance, turn off the main switch. This design method is simple and clear, not easy to fail, and easy to maintain. It can be achieved by adding an air switch as a one button power-off switch on the basis of the original electric box.
The self-locking function of AC contactor and two gear change-over switch is used to realize one key power off. The wiring method is shown in the figure:
Working process: during normal operation, all air switches are closed, and the transfer switch is rotated to the closed state. At this time, the current starts from the live line and reaches the contactor coil A2 through the change-over switch. Since the other end A1 of the coil is connected to the zero line, there is 220V voltage at both ends of the coil and the contactor is pulled in. The current supplies power to the circuit through the main contact of the contactor.
If you need to go out for a long distance, just turn the change-over switch to the off state. At this time, the contactor coil is powered off, the main contact is disconnected, and each circuit at the back end of the contactor is powered off.
One key power-off switch (intelligent switch) can also be used to realize one key power-off. The wiring method is similar to method 1, as shown in the figure.
If the family has not been decorated, it is recommended to use the wired panel of scheme I; For families that have been decorated and inconvenient to lay lines, scheme II can be adopted. Scheme 1 is relatively more accurate and reliable than scheme 2 because it adopts wired control; Just like a wired network connected to a wireless network, a wired network must be more reliable and anti-interference.
The above three methods can realize one key power off. Scheme 1 is the simplest and easy to use. It only needs to add an air switch. It is reliable, low-cost, and easy to buy components. Scheme 2 is a little more troublesome than scheme 1 because the change-over switch is difficult to fix. Scheme 3 one button power-off is the most convenient and flexible. The one button power-off remote control panel can be placed at any position.