Which of the following is NOT a function of an overcurrent protection device?

Overcurrent protection devices, such as circuit breakers and fuses, primarily serve to protect electrical circuits by interrupting the flow of excessive current, which can occur due to overloads or short circuits. They help prevent overheating of conductors and equipment, which can lead to fires and other hazardous situations, fulfilling the functions of interrupting excessive current flow, protecting against overheating, and safeguarding the circuit from damage.

The function of preventing voltage spikes, however, is not a primary role of overcurrent protection devices. Voltage spikes, often caused by lightning strikes, switching operations, or equipment failures, are better managed by surge protection devices and not by overcurrent protection devices. Consequently, while overcurrent devices ensure safety by controlling current levels, they do not address voltage issues directly. Therefore, the correct answer identifies the function that does not belong to overcurrent protection devices.