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It depends on the efficiency and the Max amp draw to be safe (you could be lesser to a point depending on minimum ampacity) There should be a plaque that has a max over-current or max breaker size. some high seer a/c's might need a 20 amp breaker for a 4 ton some older units may be 50, you really need to check it with the plaque.

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Q: What size breaker for a 4 ton air conditioner unit?
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