Author Topic: Signal Relay Selection Help  (Read 782 times)

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Offline gogomanTopic starter

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Signal Relay Selection Help
« on: August 09, 2018, 01:17:59 pm »
Hi  I'm looking at signal relays in particular a mechanical  non latching because of it's  low on resistance and input capacitance <10pf (yet to find a SSR  with these spec's)
Is this  non latching relay suitable for continuous operation:

https://www.digikey.com/product-detail/en/te-connectivity-potter-brumfield-relays/3-1462039-1/PB1166CT-ND/1828460


thanks

 

Offline JS

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Re: Signal Relay Selection Help
« Reply #1 on: August 09, 2018, 03:58:15 pm »
  Yes, relays are pretty reliable even when powered for a long time, failure is given for a cycle count depending on the current and voltage conditions while commutating rather than on time or duty.

  If powering them for long periods you might want to use a parallel RC in series with the coil, so when you switch them you get a spike in current able to do the commutation and then go to a lower current to hold. This saves power and makes the coil more tolerant to higher voltages than rated if you are powering it from a bad power source.

  Note that for the 12V coil the operate voltage is 9V and the release voltage 1.2V, so you need at least 9V to go from one state to the other but only need to warrantee 1.2V to hold the contact in place. If there is a case where you de-energize the coil for a moment and then reenergize it again you need to be sure the cap discharges in between.

JS
If I don't know how it works, I prefer not to turn it on.
 


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