A safety switch, also known as a residual current device (RCD), is an electrical device designed to prevent electric shock and reduce the risk of electrical fires. It works by monitoring the flow of electricity through a circuit and quickly disconnecting the power if it detects an imbalance, which may indicate a fault or leakage of current. Safety switches are commonly installed in homes and workplaces to protect people from electrical hazards. They are particularly important in areas with water, such as bathrooms and kitchens, where the risk of electric shock is higher. Regular testing of safety switches is recommended to ensure they function properly.