What defines an open transition?

An open transition is characterized by the moment when the connection to the original power source is interrupted before a new power source is connected. This process ensures that there is a clear separation between the two sources. By opening the power source breaker before closing the new power source, it allows for a safe transfer and mitigation of potential short circuits or faults that could arise if both sources were connected simultaneously.

This method is often utilized to ensure the reliability and protection of the electrical system. It is particularly critical in applications where maintaining power quality and minimizing transitions is a priority. In situations where high loads or sensitive equipment are involved, managing the switch between power sources without overlap (which could cause disturbances) is essential.

The other options do not capture the essence of an open transition effectively. For example, closing the breaker before opening the original source or having the generator operate prior to the transfer would entail different transition methods, whereas the scenario involving a temporary power cut emphasizes the characteristic of open transition. This temporary cut is indeed a distinct feature of this transition type, but it does not define the mechanism itself as directly as having the breaker open before connecting the new source does.