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
Started by ●October 19, 2021
Reply by ●October 19, 20212021-10-19
On 10/19/2021 11:08 AM, Bob Engelhardt wrote:> 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, BobIf the designers marked it, probably would be good to follow that.
Reply by ●October 19, 20212021-10-19
Yeah ... I guess what I was really wondering was why they would do that.> If the designers marked it, probably would be good to follow that.
Reply by ●October 19, 20212021-10-19
On 19.10.21 21:33, Bob Engelhardt wrote:> Yeah ... I guess what I was really wondering was why they would do that. > >> If the designers marked it, probably would be good to follow that. >they should do that if a built-in diode is present. Also, the plus and minus identify the coil pins.
Reply by ●October 19, 20212021-10-19
On 10/19/2021 4:26 PM, Sjouke Burry wrote:> On 19.10.21 21:33, Bob Engelhardt wrote: >> Yeah ... I guess what I was really wondering was why they would do that. >> >>> If the designers marked it, probably would be good to follow 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.
Reply by ●October 21, 20212021-10-21
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.
