Re: Quick-and-dirty testgear: mains voltage monitor.
Before re-use of the fuses that you have, do confirm that they are in fact fuses that protect against overcurrent.
If intended to be concealed within the windings of a small transformer they may well be thermal fuses that open at a certain temperature.
Such thermal fuses WONT open on overcurrent unless so gross that the plug fuse or circuit MCB has probably operated first.
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