Which of the following is included in electrical protective devices?

The best choice for the category of electrical protective devices is circuit breakers. Circuit breakers are designed specifically to protect electrical circuits from overload and short-circuit conditions. When an unwanted surge of electricity occurs, such as a fault in the wiring or an overload situation, a circuit breaker will automatically interrupt the flow of electricity, preventing damage to the wiring and connected devices.

Transformers, switches, and resistors play different roles in electrical systems. Transformers are used primarily for voltage conversion, allowing electrical energy to be transferred between circuits at different voltage levels. Switches control the flow of electricity but do not provide protective functions in the same way circuit breakers do. Resistors help manage electrical current and voltage levels but also do not offer protection from faults. Therefore, circuit breakers stand out as the essential protective device directly designed for safeguarding electrical systems.