French term (edited): les fins de course doivent pouvoir couper du 48 Vcc

or: ...switching capacity...

Or if you really want to stick closer to the FR wording:

...must be capable of switching 48 Vdc


These are more natural, idiomatic ways of expressing it.

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Note added at 5 hrs (2007-01-22 14:51:02 GMT)
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To respond in more detail to Giovanni's comments:

We certainly talk about the "breaking capacity" of a switch, contact etc., no dispute there!

However, I would be reluctant to add in the word "load" that is not in the original; true, sometimes when talking about switch ratings, we do indeed say "capable of switching a 10 amp load" — but in that case, we are usually emphasizing the "load current"

In the present case, we are talking about a voltage — and it comes more naturally to talk about a "supply voltage"

But in any case, there is no need to add in either "load" or "supply", since niether figure in the original text.

However, I do think it is important to make it crystal-clear that the specification is that this switch/contact must be capable of breaking / switching a circuit operating at 48 Vdc (the voltage affects other considerations, like contact separation etc.), and there is a fairly specific word order / phrasing that is commonly used to express this and will be universally understood by people in the field.