Patent ID: 8150577

Claim:
A device for ensuring a secure power supply of a sub-assembly integrated into an item of equipment, the device comprising: a power supply line linking the sub-assembly to a power supply source; an interface to receive a first and a second discrete state indicator relating to a first and a second state cue, the first and second state cues characterizing an operating phase of a system incorporating the item of equipment; and a first, a second, and a third controlled make/break switch, arranged in series on the power supply line, wherein: the first and the second make/break switch are actuated to an “open” or “closed” position based on a “0” or “1” logic state of said first and second discrete state indicator; and the third make/break switch is actuated by a validation command based on the “0” or “1” logic states of said first and second discrete state indicator and an ability of the first and second discrete state indicator to change state.