The best replacement for 20 amp circuit is 15 amp.

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

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Speaking about 20 amp circuit, one probably shouldn't forget about 15 amp outlets.

Other search terms related to 20 amp circuit and their ratings are:
★★★★★ 15 amp outlets
★★★ 14 2 wire
★★ 15 amp switch
★★ 15 amp receptacle
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20 amp circuit
15 amp