Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 12 subscribers
  • Views 511 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Optocoupler and mechanical relay failure modes / symptoms

Jam

I am considering the use two identical relays with their control "coils" in series.

(I am aware that the normal arrangement would be parallel)

My understanding is that with optocouplers the failure modes are generally in the load switching side (for various internal reasons) and it is unlikely that the control circuit fails open circuit. Hence if one of the devices goes faulty the other (which will be rated for the full voltage should the control short circuit) will be unaffected. Does this match with operational experience?

From an operational perspective, what are the common failure modes for optical and mechanical relay? Assuming a well-selected device, what kind of faults do control circuits see most frequently, or is it so rare (compared with the switching end) as to not be worth considering?

Parents
  • 0

    Thanks both.

    Yes, looking at multi-voltage devices so doubling (or halving) the voltage is okay.

Reply
  • 0

    Thanks both.

    Yes, looking at multi-voltage devices so doubling (or halving) the voltage is okay.

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines