Patent ID: 7642669

Claim:
An electrical circuit arrangement comprising: an unlatching actuator; a primary power source; a secondary power source; an electrically controlled bypass switch having an energized condition at which the electrically controlled bypass switch adopts a first switching configuration and a de-energized condition at which the electrically controlled bypass switch adopts a second switching configuration; and an operator actuated switch, wherein the electrical circuit arrangement has a first configuration in which the electrically controlled bypass switch is in the first switching configuration with the primary power source, the operator actuated switch, the electrically controlled bypass switch and the unlatching actuator configured so that actuation of the operator actuated switch causes the unlatching actuator to be energized by the primary power source, and wherein the electrical circuit arrangement has a second configuration in which the electrically controlled bypass switch is in the second switching configuration with the secondary power source, the operator actuated switch, the electrically controlled bypass switch and the unlatching actuator configured so that actuation of the operator actuated switch causes the unlatching actuator to be energized by the secondary power source.