Regarding the statements on circuit protective devices, which is true?

To understand why the selection of "Only the first statement is true" is correct, it’s important to consider the nature and function of circuit protective devices. These devices, such as fuses and circuit breakers, are designed to prevent damage to electrical circuits and components by interrupting the flow of electricity during abnormal conditions, like overcurrent or short circuits.

When assessing two statements about circuit protective devices, if the first statement accurately describes a fundamental attribute or function of these devices—such as their purpose in protecting both equipment and personnel—then this is a clear indication of its correctness. The statement likely outlines essential safety features or operational principles that are well-established in electrical engineering.

The second statement may introduce information that is either incorrect or less universally applicable, which means that while the first statement stands true, the second does not hold up under scrutiny. This highlights the importance of understanding specific characteristics of circuit protective devices and recognizing which statement accurately reflects established knowledge.

In this context, selecting that only the first statement is true reinforces the critical role that circuit protective devices play in electrical safety and system integrity. Understanding these devices and their functions is crucial for anyone involved in electrical design, maintenance, or safety practices.