In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:

[quote="Steel"]
Can you also just put a 9VZener in parallel to the circuit on the frontside, so that the Zener dumps anything over The 9V?
  No (that is, [i]No Way[/i].)  Zener current [[b]I[/b][sub]Z[/sub]] must be limited.

  Sometimes a Zener is used this way (in parallel with the input) when the greatest expected input voltage is "just a tad" greater than the Zener voltage [[b]V[/b][sub]Z[/sub]], intending to then clear a fuse as a result.

  Also, "pre-regulating" with diodes (pl.) isn't a panacaea, either (i.e. don't get carried away.)[/quote]

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