I have a DC relay with the coil connections marked "+" & "-". Does it matter? The relay operates with either polarity so there is no internal flyback diode. It's a 24v, 33ma coil for those who want to know.
Thanks, Bob
DC relay coil
Oct 19, 2021
5 Replies
If the designers marked it, probably would be good to follow that.
Yeah ... I guess what I was really wondering was why they would do that.
they should do that if a built-in diode is present. Also, the plus and minus identify the coil pins.
They may use that package to make units with the diode.
I Googled it (like I should have in the first place). There are a couple of reasons that a DC relay may be polarized:
- internal flyback diode (as mentioned)
- an internal LED indicator
- a permanent magnet used to augment the mag field
- in a latching relay
My relay does have a LED indicator, so that's what I'm assuming is the reason for my polarization. And not a permanent magnet.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required