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Which anti-trap protection do powered windows require?

  • A.A fuse, which opens if the motor stalls and therefore prevents any injury from occurring to the occupant
  • B.None
  • C.Monitoring of the motor current or speed, so an obstruction is detected and the window reverses automatically
  • D.Detection of an obstruction and reversal

Answer: D

Current or ripple monitoring detects the resistance an obstruction produces. The last option describes exactly that mechanism, which makes it a correct and more detailed version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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