Patent ID: 8547672

Claim:
A system for conditioning an alternating current (“AC”) power transmission for supply to a load circuit, the system comprising: an inrush current suppressor configured to limit the current of the AC power transmission, the inrush current suppressor including: a first relay switch disposed in a first circuit path between an AC power source and the load circuit and configured to selectively open and close the first circuit path, the first circuit path being configured to limit the current of the AC power transmission supplied to the load circuit; and a second relay switch disposed in a second circuit path between the AC power source and the load circuit and configured to selectively open and close the second circuit path; a voltage sensing circuit configured to monitor a voltage level of the AC power transmission and to generate a voltage level signal indicating whether the voltage level of the AC power transmission is in a normal range between an upper limit and a lower limit; and a controller operably coupled to the voltage sensing circuit and the first and second relay switches, wherein the controller is configured to: control the first and second relay switches to close sequentially to supply the AC power transmission to the load circuit via first the current-limited first circuit path alone and then by the first and second circuit paths, the sequential closing of the first and second relay switches proceeding only while the voltage level signal indicates that the AC power transmission is in the normal range; and control any closed ones of the first and second relay switches to open responsive to the voltage level signal indicating that the AC power transmission is not in the normal range so as to disconnect the AC power transmission from the load circuit.