What is the primary purpose of circuit protective devices?

The primary purpose of circuit protective devices is to protect units and wiring in the circuit. These devices are designed to prevent excessive current flow, which can lead to overheating, potential damage to electrical components, or even fires. By interrupting the circuit when a fault condition occurs, such as a short circuit or overload, these protective devices ensure the safety and integrity of the electrical system. This safeguarding capability is crucial in maintaining the reliable operation of electrical equipment, as well as the overall safety of the system.

The other options highlight functions that do not align with the role of circuit protective devices. Enhancing current flow, increasing voltage, and converting electrical energy to mechanical energy focus on different aspects of electrical systems that do not relate to protection.