Two limit switches or alike will be used to indicate the extreme has been reached during the operation of motor. The intention was to search for a small and cost effective switch that is able be stand a maximum of around 15N(may not be accurate that needs to be justified). The search had also been limited onto vertical switches with a push button.
During the search, the term "slow action" came up frequently. It is characterized by a release position that is the same as the operating position. The switch actuator's speed directly conditions the travel speed of contacts.
Another form of contacting mechanism is Snap Action that is characterized by a release position that is distinct from the operating position (differential travel). Snap breaking of moving contacts is independent of the switch actuator's speed and contributes to regular electric performance even for slow switch actuator speeds.
Info from http://www05.abb.com/global/scot/scot209.nsf/veritydisplay/bfff30eb0da19bd385257615007532ca/$file/1sxu000023c0202_09_general_tech_data.pdf
Possible choises:
http://uk.farnell.com/bernstein/600-8104-025/limit-switch-1no-1nc-slow-make/dp/3204728 - 10N
http://uk.farnell.com/honeywell-s-c/gldb-01b/limit-switch-pin-plunger/dp/560390 - 16N
And the Honeywell GLL Series
However, the sizes of these switches are still a lot larger than ideal (min height around 50mm), thus other possibilities may need to be considered.
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