If you check my original post, you will see I used NTC.
my later use of PTC was a typo on my part.
Capacitors behave as short circuits to transient pulses.
Because the snubber capacitor is there, the back EMF
voltage never rises to the potential it would were it absent.
The capacitor voltage rating should be about double the
quiescent voltage it could achieve. In the case of a
snubber for 120V, 2 x 1.414 x mains rms voltage would suffice.
-Chuck Harris
M Yachad wrote:
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"the PTC is in parallel with the resistor, not in series"
Just to confirm that it is definitely an NTC, not a PTC, in the 2465
"EMF is a high voltage phenomenon, not a high current phenomenon.
The current cannot be higher than the operating current of the supply.
The voltage can rise to thousands of volts."
To clarify:
If the voltage can rise to thousands of volts, then the capacitor which bypasses an on-off switch should rather be a DC capacitor rated to 5KV, and NOT an AC Class X1/Y1 unit.
Is my thinking correct here?
