I need help . I am very confused . So this is a washer Samsung board . I found that 12 DC rails is connected to 220 ac rails with triac . How is it

 

I need help . I am very confused . So this is a washer Samsung board . I found that 12 DC rails is connected to 220 ac rails with triac . How is it possibleView attachment 321582

Red color is DC the yellow is ac . And the 4 pin where is yellow is . Are bridge rectifier

 

It might possibly be a portion of a switch-mode supply. OR guessing wrong on what a component is.