Ador Powertron Limited manufactures Stand-alone On-Line Double-Conversion UPS. Ador Powertron Limited is an ISO 9001 accredited company. Ador Powertron Limited offers diverse types of AC motors, rectifiers, high-voltage, tachogenerators; modular parallel ups system, battery test equipment etc. Stand-alone On-Line Double-Conversion UPS provides backup power for use when the utility ac electric power mains fail or drop to an unacceptable voltage level. This On-Line Double-Conversion UPS continually eliminates surges, spikes and sags that are inherent in commercial utility power.