French to English Tech/Engineering Electronics / Elect Eng Industrial equipment

This term is being applied to a relay, and I can't understand what it means; logically, it would be either 'energizing' or 'de-energizing', but there's not enough surrounding context to confirm, or indeed, decide which! So in view of my looming deadline, and while I pursue other avenues of research, I just wanted to ask, please, if anyone else has ever come across this curious usage with 'relais'. I should add that the whole of my document is littered with slightly quirky usages and what I suspect is inter-techie jargon :-(

For confidentiality reasons, I can't quote the actual context, though to be honest it doesn't help anyway: it is just a bullet point in a list of events in a sequence, and it says « montée de relais X pendant 5 secondes pour... » — it's all pretty telegraphic, and sadly, there are no clues to the meaning elsewhere in the text. Like I say, logically it would seem to me it must mean that the relay gets energized for 5 s; the only danger is that it might be a N/C relay, which gets de-energized! This would not be inconsistent with some of the other eleemnts in this equipment, where techniques of power failure fail-safe are used, for example.

Help, has anyone come across this usage before, please?