The answer to 'lifespan of circuit breaker' is that with proper maintenance and usage, a circuit breaker can typically last 30-40 years or more. Circuit breakers are designed to be durable and reliable, but their lifespan can be affected by factors like the number of times they've been tripped, exposure to environmental conditions, and the quality of the initial installation.
Well-maintained circuit breakers in a residential home that don't experience frequent tripping can often last the full lifespan of the home, which is usually around 40-50 years. However, it's important to have them inspected and tested periodically to ensure they are still functioning properly and can safely interrupt electrical current in the event of an overload or short circuit.