UPS Systems, Uninterruptible Power Supplies. Piller is a world leader in power protection technology, building UPS systems for "mission critical" applications world wide. Clients include many of the world’s leading banks and financial institutions, broadcasters, telecommunication networks and many other organizations. Piller's product portfolio comprises high capacity rotary UPS , static UPS , static transfer switches and converter systems and with the highest levels of customer support and engineering excellence available anywhere, has led Piller to be internationally recognized as arguably the most respected name in its field.