Siemens circuit breakers do not have a strict expiration date or fixed calendar replacement schedule, meaning high-quality thermal-magnetic devices can easily function for 30 to 40 years or more under normal residential operating conditions. However, their internal mechanical trip components can degrade over time due to chronic heat exposure, high humidity, or severe electrical surges. They should be inspected periodically and replaced immediately if they exhibit nuisance tripping, burn marks, or loose toggle handles.
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