You can download the technical documentation on the breaker at this site:
http://www.squared.com/us/products/c...56A630064BC8F/$file/QOUcircuitbreakerFrameset.htm
Download document 0720CT9401, "QOU Miniature Circuit Breakers and Switches".
Tripping mechanisms are shown on pages 1 & 2 - both the thermal (inverse time) and the magnetic (instantaneous).
Thr trip curve is the right-hand one on page 14. It shows both the "inverse time" characteristic of the thermal mechanism, and the "instantaneous" magnetic mechanism.
Look at figure 1 on page 2. Of course a breaker on the verge of tripping will trip off when "mechanically agitated". It really wouldn't matter much what the mounting orientation is, either. It's ready to trip, it gets hit, it trips.
Once you look at, it appears very simple - deceptively so. Many such things will come back to bite you in your engineering career.
Beware of using equipment in applications outside the design basis. Very few electrical distribution cabinets move. Even the best of us (i.e., Dr. Joe) can be fooled on occasion.