Connect 12 Led 3 switch
simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Three-switch circuit. D13 and 14 prevent cross-feed from one circuit to the other.



[Late information supplied in the comments.]


  Voltage for led its 220 V converter by the led itself to 12V. I will mount it on ceiling and i want to turn it on side by side 4 with one switch and 8 with second switch .








simulate this circuit

Figure 2. Mains version.

For domestic wiring regular wall mounted light switches should be used that comply with the electrical regulations of your country.


SW1 and SW2 are regular single-pole switches.
SW3 is a 2-pole switch.
You do not require relays or accessories.


Again, it is not clear why you want SW3 when you can have the same effect by switching on SW1 and SW2. It seems likely to lead to confusion.

Of more concern is that if you are asking this question then you are unlikely to be qualified to perform the installation. You may wish to reconsider taking on this project and get professional help instead.