(Topic ID: 119958)
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You could alternatively place an NPN in series with the fuse, a bias resistor between collector and base, and the 190V zener from base to ground. This would effectively be placing a 190V regulator in series. It would normally be saturated and passing the input voltage (170V) through unless the voltage spikes above about 190V, then it will clamp it there, opening the transistor to take the drop from the maximum down to 190V. If you were clever, you could include an LED that would come on to tell you your primary regulator has bitten the dust and you are running on backup. Yes, overkill. 
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