Which of the following is a factor that must be considered when selecting overcurrent protection devices for a motor control circuit?

The rated full-load current of the motor is a crucial factor in selecting overcurrent protection devices for a motor control circuit. This current represents the maximum continuous current that the motor is designed to draw under normal operating conditions. Overcurrent protection devices, such as fuses or circuit breakers, are designed to trip when the current exceeds a certain threshold to prevent damage to the motor due to overload or faults.

Selecting a protection device that is appropriately rated in relation to the motor's full-load current ensures that it will effectively protect the motor while allowing it to operate under normal conditions without nuisance tripping. This means the device must be rated to handle the full-load current without interruption while still being sensitive enough to disconnect the circuit in the event of a genuine overload or short circuit.

Considering voltage rating, motor housing size, or brand does not directly impact the effectiveness of the overcurrent protection in safeguarding the motor operation. Thus, focusing on the rated full-load current ensures that the protection device can adequately react to and protect against potential excess current situations.