Which of the following is NOT a component of a conventional circuit breaker?

A conventional circuit breaker typically includes several key components designed to protect electrical circuits from overloads and short circuits. Among these, a link capable of melting under overload serves as a thermal mechanism, allowing the circuit to break and prevent damage during overload conditions. A manual on/off switch provides users the ability to control the flow of electricity manually, enhancing safety and convenience.

The inclusion of a spring mechanism to reset the breaker is also important; however, this feature is more characteristic of certain types of circuit breakers, particularly those that are resettable following an overload or short circuit event.

In contrast, an electronic control module is not a standard element in conventional circuit breakers. Instead, it is typically found in more advanced types of breakers that offer additional features, such as adjustable trip settings, remote monitoring, or integration into smart grid systems. Therefore, the option indicating the presence of an electronic control module defines a distinction from conventional circuit breakers, making it the correct choice for what is NOT typically included in their standard design.