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Gullberg gives "automatic staircase lighting (switch), staircase time switch".
Akademiens ordbok gives "automat för (tändning o.) släckning av elektriskt ljus i trappa l. trapphus o.d."
It's that "o.d." which opens the door to Deane's position that this can apply to automatic switches beyond stairwells. A case of how language evolves (usually for the worse!).
Also given the context, I have to agree, reluctantly, with Deane's generic solution, although if you do use it, I recommend you put a note reflecting its additional original meaning.
Separately, I now prefer "stairwell" to "staircase".
The 'function' has nothing to do with stairwells, but it can be used in any structure with more than one lighting fixture... which includes a stairwell, and, like the say a corridor or large room. A switch with just 'on/off' is not this kind of switch. It has (settings 1, 2, 3,...) for lighting fixture 1, lighting fixture 2, and so on. Can also apply to groups of fixtures (all lights on floor 1, floor 2, etc.
You say it has nothing to do with stairs in this latter case but Wiki immediately says it can be used for stairs so the Swedish does seem to come from the idea of stairwell. I've called it "stair switch" in the later case for the moment but it's all down to you so thanks again
of this kind have many names and designations. 'Trapp' is also used in this context, see https://sv.wikipedia.org/wiki/Trappomkopplare ... which has nothing to do with stairwells. My suggestion is kind of generic, but relies on the expertise of the reference company.
I think Sven has the right translation of Trappautomat.
SafeTex reference is probably the device which operates the circuit, which Deane has translated.
Would SafeTex like to look at the context, please, and let us know?
Automatic update in 00:
36 mins confidence:
modular changeover switch
Explanation: I'm sure about the 'switch' part. But if you're looking for the same gizmo, the reference may give you an idea. Same company, different country. You can look around for more.