English translation: device connected to an APC power adapter
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Simon Mountifield Local time: 02:04 Works in field Native speaker of: English PRO pts in category: 27
682 days confidence:
appareil alimenté en +APC...
device with ignition live feed
Explanation: I'm adding this almost two years later for the benefit of those who, like me, are looking up +APC in the search function. The selected answer is wrong in the case of automotive engineering.
"Medium" confidence level because I'm not entirely sure of the exact terminology in the asker's case.
However +APC is the ignition live feed.
The link below may provide further enlightenment.