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

3.  But a typical DC 14v rated MOV will only clamp 8/20us surges at about 36v which may be too high and too sudden for the ol 78L05.....
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An AC 250v rated MOV will only clamp at 650v, which seems to be of little help.
It will only start to leak 1mA at 390v.

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Sometimes we have to wonder whether these MOVs really help at all.

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