What could happen if a single-phase motor is continuously overloaded?

When a single-phase motor is continuously overloaded, the motor may trip a circuit breaker primarily because it is drawing more current than it is designed to handle. Overloading the motor leads to excessive heat generation due to the increased current flow, which can cause the thermal protection mechanism in the motor or the circuit itself—like a circuit breaker—to activate. This action is a safety measure designed to prevent damage to both the motor and the electrical system.

If the motor operates under conditions that exceed its capacity, various problems can occur, such as overheating, insulation breakdown, and eventually motor failure. The circuit breaker acts to interrupt the flow of electricity to the motor to protect it from these adverse effects, thus preventing further damage or potential electrical hazards.

In contrast, a motor running faster, increasing in efficiency, or requiring less maintenance are outcomes that are typically not associated with an overloaded condition; rather, those scenarios suggest optimal operating conditions, which are not achievable when a motor is subjected to excessive loads.