Hi,

i have a relay RT425024, in its datasheet they have mentioned one parameter as "Max. switching voltage" as 400VAC.

what is this parameter for? what does it signifies?

 

That is the maximum voltage that the relay contacts are specified to handle. Any higher and there might be insulation breakdown failure and/or arcing or other Bad Things.

The coil rating is different and is often something like 12 V dc (or ac) with minimum and maximum current given.

 

That is the maximum voltage that the relay contacts are specified to handle. Any higher and there might be insulation breakdown failure and/or arcing or other Bad Things.

The coil rating is different and is often something like 12 V dc (or ac) with minimum and maximum current given.

I also have a relay question that fits well with this topic:
1) what is a 'typical tolerance' in terms of the max voltage? (would 13V be too much? Unfortunately I don't have a datasheet...RS parts! Easy to find the dropout voltage, not so easy to safely learn the max!!!!).

2) If you are using a 'cheaply rectified' ac source to trigger your coil, and you have a LOT of ripple (like, 20%!), should you think in terms of the RMS voltage or peak voltage when sending it to the coil?? I have to know ahead of time when setting up a voltage divider for 5 units what the correct way to go is. And of course, I don't have the transformer to test the concept with! (16AC for a train, at my father in law's house). I could, of course, clean up the rippling DC signal, but then I have to get a bunch of caps, etc etc, and if possible would like to keep it simple....opinions?
thanks!

 

I also have a relay question that fits well with this topic:
1) what is a 'typical tolerance' in terms of the max voltage?

2) If you are using a 'cheaply rectified' ac source to trigger your coil, and you have a LOT of ripple (like, 20%!), should you think in terms of the RMS voltage or peak voltage when sending it to the coil??

1)Typically stated on the datasheet.. Some allow up to 150% of the nominal.

2)Slight AC on a DC relay isn't gonna hurt it..If it buzzes clean it up..Geek out with this http://relays.te.com/appnotes/app_pdfs/13c3250.pdf

 

Thanks, Mac!