Newbie here, just wanted to ask some clarification regarding reading datasheet since i don't quite find a standard way to determine switching speed. I already had surf and the closest one was the question by Glavić What does CPM unit mean in relay specification?. This means its maximum operation is 1 cycle every 10 seconds.

I have a school project where I need my relay to have a switching frequency of at least 1 cycle a second and my current relay that i have is this: https://www.digikey.com.au/products/en?keywords=alf1p05. Upon reading its datasheet, i find a max. operating speed 20 times/minutes (does this mean 1 time = 1 cycle = 1 on & off operation?? meaning 1 cycle every 3 seconds?)

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then i find this other relay https://media.digikey.com/pdf/Data%20Sheets/Panasonic%20Electric%20Works%20PDFs/jm.pdf having a max.operating speed of 180cpm. (does this mean 180 on & off operation every minute? 1 cycle every 33ms?)

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I hope you can help me at least understand this one clearly, sorry if I'm somewhat indecisive with this one.

edited: i canvas all relays on digikey, mouser, etc and every relay detasheet don't have this 'max.operating speed' spec info like this one https://www.mouser.com/ds/2/418/NG_DS_RT1_1014-729126.pdf, how can i determine the speed of this relay or other relays w/o relying on the max.operating speed spec info?

  • \$\begingroup\$ Well yes, i even include that link on my question, one has condition, the other one has none, so it does mean that the other relay can operate a cycle on & off w/ 33 milliseconds? \$\endgroup\$ – Mheruian Jan 24 '18 at 23:50

This Panasonic relay should easily be able to switch with a 1 second cycle.

The actual maximum switching speed is not listed in the datasheet, at least, I could not find it.

I know for a fact that most relays like can switch at about 5 times per second of faster.

The numbers you did find in the datasheet are not the limits but the conditions for which other specifications are given. Note how it says "Conditions" in the first column.

So I think this relay will just work for what you want.

If you want to see that in the specification as well then I suggest looking at a different relay, for example from Omron as I have seen datasheets from them where the maximum switching speed is listed.

  • \$\begingroup\$ Thanks for the reply, sorry if i really need some solid clarification, so it means the other relay media.digikey.com/pdf/Data%20Sheets/… can operate 1 cycle on and off w/in 33 millisecond w/o condition. if i apply 5vdc as my switching signal having a 220vac 10-20amp switching load, this is what i get right off the bat? also, why almost relay datasheet don't have this specs w/ regards to speed, how can i determine the speed of the relay using other spec info w/o 'max.operating speed'?? \$\endgroup\$ – Mheruian Jan 25 '18 at 0:56
  • \$\begingroup\$ For that Panasonic JM relay it says: Max. operating speed 180 cpm so that's 3 times per second on/off. So this relay does have a maximum speed spec. 180 cpm is 3 per second so that's 333 ms and not 33 ms! \$\endgroup\$ – Bimpelrekkie Jan 25 '18 at 6:40

note "at normal switching capacity"

With a below normal capacity (lower voltage or lower current) you can switch faster.


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