Recreational Vehicle (RV) Technician Practice Test

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How are 12V DC blower motors protected?

Fuses
Relays
Thermally
Circuit breakers

The correct answer is: Thermally

12V DC blower motors are often protected thermally to prevent damage caused by overheating. This thermal protection typically comes in the form of thermal cut-off switches or sensors built into the motor itself. When the temperature of the motor exceeds a specified threshold due to conditions such as excessive load, blocked airflow, or electrical faults, the thermal protector interrupts the power supply to the motor. This mechanism helps to ensure the motor does not operate at unsafe temperatures, which could lead to the deterioration of its components or even a complete motor failure. While fuses, relays, and circuit breakers are all important protective devices in electrical systems, they primarily protect against overcurrent situations rather than directly monitoring temperature. Fuses will blow when a specific current threshold is exceeded, which can prevent higher voltage from overloading the motor. Circuit breakers serve a similar function, tripping to protect against overloads. Relays can help control power flow in a circuit but do not offer thermal protection themselves. Thus, the use of thermal protection is specifically designed to address overheating issues, making it a crucial aspect in safeguarding 12V DC blower motors.