Patent ID: 8129868

Claim:
A device having a low voltage current output no-load mode and a high voltage current output load mode, the device comprising: an outlet having a positive terminal and a negative terminal; a latching relay comprising a first switching contact and a second switching contact, the latching relay being configured to switch from a first state to a second state when the first switching contact is energized and configured to switch from the second state to the first state when the second switching contact is energized, wherein the latching relay is further configured to provide a low voltage current output when the first switching contact is energized; a changeover relay comprising a third switching contact connected to the latching relay, the changeover relay being electrically connected to the outlet and configured, in the no-load mode, to receive low voltage current that flows across the outlet and provide the received low voltage current to the latching relay first switching contact, the changeover relay also being configured to switch the device from the no-load mode to the load mode when the third switching contact is energized by the low voltage current output from the latching relay, and wherein the changeover relay is further configured to receive a high voltage power input and connect the high voltage power to the outlet in the load mode; and a current monitoring relay configured to provide low voltage power to energize the latching relay second switching contact when a load is removed from across the positive terminal and negative terminal.