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Depends on the size of the wire going to the A/C. If the wire is AWG #10 you cannot install a 40 amp breaker. If the wire is AWG #8 you can.

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Q: Can a 40 amp breaker not a 4 amp breaker be used to replace a 35 amp breaker for ac unit?
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Related questions

Can a 4 amp breaker be used to replace a 35 amp breaker for ac unit?

NO!


Will a 2 pole 60 amp ITE Gould or Westinghouse breaker replace a 2 pole 60 amp T and B unit?

If the breaker will snap on the bus bar, yes.


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Replace the 30 Amp Breaker with a 15 Amp breaker.


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Yes. You should use 8 AWG wire from breaker to AC unit.


Is there any disadvantage of selecting over rated circuit breaker?

If i understand you correctly, yes there certainly can be. If you replace, say a 10 amp breaker with a 20 amp. you are losing the safety factor - the whole purpose of the breaker to begin with. Always replace a breaker with the exact same amperage rating!


Can a 3 phase 220 volt machine that usually plugs into a line with a twenty amp breaker can a thirty amp breaker be used instead?

No, you should not install a 30 amp circuit breaker to a machine which normally requires a 20 amp supply. The circuit breaker is protecting the wire to the machine. That wire is likely only rated for 20 amps, (# 12 awg). Therefore, a 30 amp breaker could allow too much current to go through the wiring to the machine and cause the wire to burn down. Replace the 3 phase 20 amp breaker with the same amperage breaker.


What is the wire size for 50 amp breaker to ac unit?

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Can 50 Amp breaker replace 45 Amp breaker?

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Can you use a 20 amp breaker for window unit air conditioner?

A 20 amp breaker might actually be needed for the installation. It depends on the wattage and voltage of the window air conditioner.