It will cost about $187 to install a new electrical breaker. The cost of a new breaker could be as low as $130 for 15 amp to 30 amp breakers. Breakers could also be as high as $280 for 200 amps breakers. The actual cost of a standard circuit breaker is usually under $30. However, AFCI or GFCI breakers can cost $30 to $100 or as much as 10x the cost of a standard breaker.