The answer to 'cost to install circuit breaker' is that the cost can vary widely depending on several factors. Generally, the typical range for a professional to install a new circuit breaker can be anywhere from $200 to $500 or more. The exact price will depend on the complexity of the electrical work, the type of circuit breaker needed, the accessibility of the electrical panel, and your location.
Factors that can influence the cost include the number of breakers being added, whether the electrical panel needs to be upgraded, and any necessary permits or inspections required by your local jurisdiction. It's important to get multiple quotes from licensed electricians in your area to get the best price for your specific project.