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AC and DC voltage ratings on pushbutton switches
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eecook:
Hi All,
I was looking for a simulated roller lever type switch on Digikey and noticed that there is a huge difference between the AC and DC ratings for each part. I am wondering why that could be?
Digikey results page: https://tinyurl.com/y52fknbl
The only things that come to mind are:
1. Tracking.
2. Finite probability of low voltage switching with an AC waveform.
But neither 1 nor 2 could explain it. Tracking is related to the RMS voltage, doesn't matter if it's AC or DC. Regarding the finite probability, the average switching voltage will be the voltage of a rectified sine wave which is very similar to it's RMS value.
Any clue?
ataradov:
This is the similar to relays. Connecting and disconnecting AC current is easier, since it naturally goes to 0 very often, so there is no arcing, or arc gets extinguished fast.
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