How Many Watts Can a 20-Amp Breaker Handle?

By Staff WriterLast Updated Apr 13, 2020 2:47:38 AM ET
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Mike Weston/CC-BY-2.0

For standard 120-volt service, a 20-amp breaker can support up to 2,400 watts on a single circuit. However, circuits should not be loaded to greater than 80 percent of their maximum capacity for long periods, which makes 1,920 watts the safe maximum for a 20-amp circuit.

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