As the contemporary refrigerator uses less power than the refrigerator in the 1970s. If somebody plugs a microwave, with ratings of 1,200 to 1,500 watts into the circuit having a refrigerator unit
then the refrigerator cycles on during the working of the microwave and thus there's a great chance for a blown breaker. In order to eliminate this, the
NEC instructs to plug the refrigerator into its own 120-volt, a 20-amp circuit with AFCI protection and GFCI protection. I normally prefer to provide both with a single outlet or by installing an AFCI/GFCI breaker.