The best replacement for 20 amp breaker is 15.

The best alternatives to 20 amp breaker are rated as following:
★★★★★  15
★★★★  30 amp
★  15 amp breaker

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Speaking about 20 amp breaker, one probably shouldn't forget about 14 2 wire.

Other search terms related to 20 amp breaker and their ratings are:
★★★★★ 14 2 wire
★★★★★ 15 amp outlet
★★★★ 14 gauge wire
★★ #14 wire
★ 15 amp receptacle
★ 15 amp switch
★ 14 gage wire
15 amp outlets
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20 amp breaker
15
30 amp