If the only appliances on the circuit are the fridge and microwave, and the breaker doesn't trip when using the microwave, the problem just about has to be either the fridge or the breaker.
Easiest place to start would be replace the breaker. Also look at the buss bar in the breaker panel where the breaker attaches, be sure the connection is good.
If the problem continues, you'll need to check the fridge. Check for the obvious first, clogged coils, condenser and evaporator fans free and working, pinched, rubbed, chewed wiring.
You'll need an amprobe to test the run and defrost circuits. Find the info tag and note the amp draw specification. With the compressor running, be sure the amperage is not exceeding the rated amps. If so there is a problem with the compressor or a fan or some component that runs when the system calls for cooling.
If that tests good, find the defrost timer. It's usually under the front cover at the bottom, or in back. With the amprobe in place, slowly rotate the timer overide until the defrost cycle starts. Watch the amp reading, see if it exceeds the tag ratings or exceeds the 20 amp breaker rating. If so there is a problem in the defrost, probably a shorted heating element.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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