Circuit Breaker - an electrical device in the main or sub electrical panel associated with an electrical circuit (receptacles, lights, etc.)
Ground Fault Circuit Interrupter - an electrical device that interrupts a circuit when it senses a ground fault. It can be tested by pressing a test button integrated into the device. It would then be reset with its reset button. It can take the form of a circuit breaker in a panel or a receptacle (which is what I assumed you have). Code requires them in garages, kitchens and bathrooms circuits. GFCI receptacles can be wired to protect downstream, non-gfci receptacles.
Unless you have a friend that's an expert, you might consider a few of the ideas presented to you in this thread before you pay$$ an expert to take a look at it.
Though the photo is a bit murky, it appears to be a BeverageAir product. Likely the MMR72 or close to it. The MMR72 is spec'd at about a 10amp current draw. It shouldn't trip a circuit breaker by itself.
A few simpler questions, if you want to try to troubleshoot your problem:
Are there other large appliances in the garage that may be on the same electrical circuit?
Is the cooler plugged into a receptacle that has a test and reset button? If yes, then it is a GFCI receptacle. Is this what is tripping?
Assuming a GFCI receptacle:
Is anything else plugged into it? If yes, try unplugging the other item.
When the test button is pressed are there other receptacles in the garage that lose power? If yes, what's plugged into those receptacles?
Second Amendment Amber
Ponchy Pale Ale - Falconer's Flight
In the Chamber:
NippleRub Ultra (Light Lager w/Mexican Lager yeast)