Operating under the direct control of, or connected to the national grid. Any main frame computer hub will have a power protection system. This will use true online UPS power supplies. True on-line UPS systems provide energy systems by means of receiving AC and then by means of an inverter transferring this into DC and then by means of a rectifier back into AC. AC-DC-AC. This is True On-line power protection having NO direct link with the mains supply. Spikes and brown outs can’t get through as there is no direct power connection. This is an adept power system providing Active Power. Clean and pure power. So what is a UPS then? It is actually a collection of electronic parts consisting of an inverter and rectifier and transformer that accepts electrical power as AC and converters to DC and then back to AC to provide a clean power source with that source stored in accompanying lead acid batteries to provide power autonomy in the event of a power loss and so maintain an uninterruptible power supply to mission critical equipment. All UPS systems have electronic parts and batteries to provide uninterruptible power protection for powercontinuity and business continuity in the event of a power outage. Any energy systems can fail, so for that reason sensitive electrical equipment require power conditioning to prevent power surge called spikes and power drops called brown outs. PowerContinuity Systems offer datapowerprotection for all your critical power supplies to ensure steadfastpower supplies. A UPS requires regular UPS maintenance to prevent and warn of possible part failure.