Help with identifying characteristics of elements power supply S040SN2400167
Could you help with identifying characteristics of elements in red
area?

My best guesses: -

Fuse, F1 2 amps 250 volt AC rated
MOV1, metal oxide varistor possibly rated at 275 volts AC
RT1 - likely to be a negative temperature coefficient thermistor to reduce inrush current

To find equivalent parts, you should use Farnell, RS components, Digikey or Mouser but, there are other likely suppliers in your area.
The RT1 device is going to be the most problematic because it is the least-defined by your pictures so, look for any clues to part numbers written on the device itself but, it's going to have about 1 to 2 ohms resistance when warm and maybe 10 to 20 ohms resistance when cold.