The phrase "power action automatic system" refers to a complex mechanism that operates using technology to carry out a particular function. Some synonyms for this phrase could include "automated power system," "electronic control mechanism," "digital power network," or "energy management device." Each of these terms highlights specific aspects of the system, such as its use of automation, electronic components, and energy management capabilities. Depending on the context, any of these synonyms could be used in place of "power action automatic system" to describe a particular device or process. Ultimately, the most appropriate synonym will depend on the specific details and intended meaning of the original phrase.