This is electrical equipment that allows the user connecting single phase loads from a three phase supply to have continuous power supply in case of one of the three phases fails. Single phasing is a frequent phenomenon with utility companies in the developing countries. The APS has additional feature to connect to a genset and supply the load with power from the generator.
The sequence of switching is made to customer’s specification. When you battery banks you can fully utilize them to a certain level say 48V DC before the genset in case of total commercial power failure. This system monitors the battery bank supplying the site to a point where the battery has reached a certain threshold set by the user, then if commercial power has not resumed, a signal is sent to the genset to start up, supply the load and charge the battery bank. If the battery reach float charge before commercial power resumes, the site goes on battery again. This sequence has the benefit of conserving the environment by using less fossil fuels and also saving the service provider revenue on cost of running the genset. An added feature for user is an SMS module that overrides the controls and you can remotely trigger the Genset remote and also monitor real time alarms such as gen running and mains supply etc. Potential free contacts are normally provided if the user needs to monitor his alarms. The contacts are either normally open or closed.