T&L Publications

Industrial relays, in addition to pin numbers, also have function designations for their terminals. for instance:

A1, A2 = coil connections
11 = pole #1 common
12 = pole #1 N/C contact
14 = pole #1 N/O contact
21 = pole #2 common
22 = pole #2 N/C contact
24 = pole #2 N/O contact
31 = pole #3 common

and so forth.

After spending an hour on Google and a few other spots, can anyone pop up with an authorative Web site that provides the various designations for these connections? For instance, the above was put together just by common sense, but what does the "A" in A1 and A2 mean? Is there a "B", etc. Are there "numbers" other than 11, 12 and 14 for a pole? Please don't provide a lesson here ... I need something "official", such as from Allen-Bradley, Siemens, ANSI or whatever.

Thanks in advance.

Dean

Hello Dean,

The Leach web site (www.leachintl.com) has the Leach catalog. The 065D relay uses the following designations:

X1, X2=Coil Connections
A1=pole #1 NO
A2=pole #1 COM
A3=pole #1 NC
B1=pole #2 NO
B2=pole #2 COM
B3=pole #2 NC

The KD relay uses these designations:

X1, X2=Coil Connections
A1=pole #1 NO
A2=pole #1 COM
B1=pole #2 NO
B2=pole #2 COM
C1=pole #3 NO
C2=pole #3 COM
11=auxillary pole NO
12=auxillary pole COM
13=auxillary pole NC

As you can see, the logic in the designation system is similar, but the actual designations are slightly different, with primary contacts identified by letter and auxillary contacts by number.

It would appear that each manufacturer does their own thing, but some systems may be similar.

rshayes

Hi.
And automotive relays/circuit nodes have a distinctive numbering, like the 85, 87, 88, 30, 15 on post #2 here:

http://www.mp3car.com/vbulletin/hardwar ... ams-2.html

Which I have never been able to find information about. Does anyone know?

Miguel

Yeah, I knew that automotive relays had standard numbering within their industry and that it didn't overlap industrial electrical products. Also, I forget to check that "12" was definitely N/C vs. N/O. Too lazy to check now and it really doesn't matter.

Dean

Externet wrote:Hi.
And automotive relays/circuit nodes have a distinctive numbering, like the 85, 87, 88, 30, 15 on post #2 here:

http://www.mp3car.com/vbulletin/hardwar ... ams-2.html

Which I have never been able to find information about. Does anyone know?

Miguel

DIN standard 72 552 for European cars...
http://www.motor.com/magazine/pdfs/042003_07.pdf

Thanks for shining light into it, sparkle.

And what a dissappointment ! , I thought this would have some clever anything into it, but naming the relay pins 85, 30, 87, etc... shows no reason at all, is not a bit better than C; N.C. ; N.O.
The circuit nodes are pure arbitrary figures with nothing intrinsic that helps identifying. Just more sht to memorize.

Naming 30 to battery which could be B+ and 31 to ground (instead of gnd)... what an arbitrary stupidity. I can make my own DIN that way too
Miguel

Sounds like you don't like N.O. (normally open), N.C. (normally closed), or C (common), where normal is no power applied to the coil???

Dean Huster wrote:Industrial relays, in addition to pin numbers, also have function designations for their terminals... I need something "official"...
Dean

http://www.labplan.ufsc.br/congressos/T ... 06_398.pdf

Hello Dale.
To the contrary, I do prefer NC NO C and happy with them as they are a label and they are self explanatory.
I just expected a clever something DIN and there is nothing...
Miguel