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What is the strength required to push a ZB4BC2

The force to push a ZB4BC2 without contact is 12,3 N (new product) and 13,5 N (after ageing 5 millions cycles) according to test DHM 98-309
According to the catalogue, the effort for 1 contact to change state is 2 N (contact NC) and 2,3 N (contact NO)
We made a short test to have the maximum effort (push over after changing state) with 9 contacts (6 NO + 3 NC) + head: about 40N
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