Can you connect 110 volt circuit breaker to 220 volt circuit?

No, you cannot directly connect a 110-volt circuit breaker to a 220-volt circuit. Circuit breakers are designed for specific voltage ratings, and using a 110-volt breaker on a 220-volt circuit can lead to improper operation, potential equipment damage, or safety hazards. If you need to work with a 220-volt circuit, you should use a breaker rated for that voltage. Always follow electrical codes and consult a qualified electrician for such modifications.