The answer to 'how long does circuit breaker last' is that with proper maintenance, a circuit breaker can typically last 30-40 years or more. Circuit breakers are designed to be durable and reliable, but their lifespan can vary depending on factors like the number of times they've been tripped, environmental conditions, and the quality of the breaker itself.
Regular inspection and testing by a licensed electrician can help ensure your circuit breakers are functioning properly and identify any issues before they become a problem. It's generally recommended to have your home's electrical system inspected every 3-5 years to check for any needed repairs or upgrades.