That's a little overkill.... but yeah that would work fine.
Umm, no, it won't!
The reason for the Zener in my circuit is to protect against over-voltage to voltage regulator input
Well now, firstly you have the Zener the wrong way round
- it will simply directly conduct and blow the fuse.
So, connect it the right way round? No. You specified a 1N4732, which is a 4.7V Zener which will again, conduct heavily and blow the fuse. Were you even to connect it to the output
of the 9V regulator (or even a 5V regulator), it would draw a heavy current and shut down the regulator.
Arguably, a 1N4745 specified at 16V would be appropriate. On the other hand, better to make it more like 27V, a 1N4750 which will clamp at a voltage the regulator is stil rated (35V) to handle comfortably (at least as a transient).
I did not see a zener voltage so I figured it was a fast switching diode.. my bad