limit switch

a switch that automatically cuts off current to an electric motor when an object moved by it, as an elevator, has passed a given point.

1925–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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More from Translator Word FAQs presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Example sentences
The following diagram shows a mechanical limit switch wired to a pair of
  indicator lights.
The hoist upper limit switch can be used as a stop only when the hoist is
  equipped with a backup limit switch.
Raise empty hook at creep until limit switch trips and stop hoisting motion.
For example, it is not the intent to manually operate and test each limit
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