If refrigerator does not become on at all as if there is no power supply,can it be a trip relay?(except the plug)

Refrigerators are never supposed to be on GFCI devices, they will tend to "leak" a bit of current to ground during defrost and "trip" when there is no real problem... You can test this theory by plugging the machine into a two-prong adapter to see if it still exhibits the same symptom, the only problem I have seen in home refrigerators that can trip a 20 amp circuit break is a seized compressor that is drawing "locked rotor amperage." By design, the start relay/overload should interrupt power before this happens... Hard Start Kit RCO410

There is either a shorted part in the power supply section or a shorted part (say a transistor if it uses them) in the main amp section. This will be located on the big heat sink. Power supply culprits are transformer, any semiconductor device, such as power regulator, rectifier etc.

Are you sure the plug into the wall doesn't have an intermittent short? Sometimes the wiring right at the plug is broken. If the breaker is tripped, this means there is a problem with the power supply, the wiring or the breaker itself.

Either the start relay in the compressor is grounding electrically or the defrost heater is (most likely start relay). To replace this yourself is difficult as it requires technical knowledge. If you are located in California, bay area I could help you personally

If you're referring to a GFCI (Ground Fault Circuit Interrupter) breaker tripping, a refrigerator should not be plugged into a GFCI circuit because of the sudden load it requires to start the compressor, etc when it kicks on. The GFCI breakers are meant to be very sensitive, and over time the sudden energy demands caused by a refrigerator can weaken the breaker's threshold, causing them to trip often. Try connecting the refrigerator to another circuit that isn't on a GFCI breaker. If there are no other circuits nearby, you may wish to replace the GFCI breaker with a standard breaker, and replace the receptacles with GFCI receptacles, except of course, the one the refrigerator is plugged into. Be sure and consult and use a qualified electrician for this. Hope this helps..

The start relay should be on the side of the compressor and attached to the three prongs that wiring attaches to on the compressor.Is the problem causing the breaker to trip in the circuit breaker box? Sea Breeze
You can have someone match the start relay and the run capacitor at a refrigeration supply store near you or you can contact Summit
HERE
http://summitappliance.com/support

You will need to change the overload relay and run relay on the compressor.
Here is the overload relay.
Here is the run relay.

IT MAYBE THE RESISTANCE OR THE THERMO SWITCH.GET A TECHNICIAN!

The fridge can cut off if there is a power flickering or variation as the relay will be energised to trip off. Once the fridge is off the self timer - 5 minutes- will be active to allow the gas/oil to come back to the compressor as the flickering would have produced an irregular pumping.
After about 5 minutes the processor will energise the relay to contact and start.
Now the main issue is the voltage in your household. if the voltage is low then the fridge will not start again as it will click and shut off. So make sure that there is sufficient voltage in the mains supply. Also the plug point where the fridge is connected must deliver good voltage/current as the wiring must be good to carry the load . If not the fridge will trip off whenever there is a power flicker.
Finall if the power is good then the fridge mut be checked as it cannot be off for 24 hours. register you complaint for warranty service.
If power is irregular use an auto- voltage stabiliser .

it's the relay snapping..maybe it's hot, or bothered, and needs to be replaced. it's usually at the bottom of the unit, and not hard to get too..

kenmore parts are at www.sears.com