Can you spot the difference? It’s a bit hard to tell to the untrained eye. The top right breaker in the electrical panel has been added or replaced. The new breaker is a different brand from the panel enclosure and is not listed on the label of the inside panel (not viewable here). Breakers must be UL listed and certified for each panel to ensure proper operation. The compatibility of the breaker to the panel needs further evaluation by a licensed electrical contractor to ensure safe and proper operation of the overcurrent protection systems. This is extremely important because without proper compatibility, the top breaker might not trip if overloaded which can lead to overheating and possibly cause a fire. These electrical panels are one of the many systems that gets checked during a home inspection.