Anyone understand on fridge fuse working mechanism ?

[abdulbadii]

Anyone familiar or understand on fridge fuse working mechanism ?
I'm almost blind about it

[DavidKo]

Do you mean the bimetal temperature fuse on the compressor? Fridge stops working and starts again in intervals, but it does not cool. In my case this was caused with defect "relay" for startup winding which had caused over heating.

[CatalinaWOW]

If you are asking how the fuse (actually a switch) works, it is a simple bimetal disk formed into an appropriate dome shape.  Contact is from the top of the dome and the rim.  When the higher expansion coefficient metal on the outside of the dome expands enough it forces the dome to invert breaking contact. 

Depending on the metals and exact shape of the disk the inversion can be permanent, or reverse when the temperature drops again.

In most cases the switching temperature is set at the manufacturer, but there are rare cases where an adjustment screw allows some tweeking.

Googling "bimetal thermal switches" and "snap disks" should get you enough reading material to keep you going for weeks.

[abdulbadii]

What'd be the main purpose of airtight pouch there

[Nusa]

Keeps moisture out, which prevents corrosion.