[VoIP] OT - Wirespring relay part numbers

[Steph Kerman]

It's an arbitrary code assigned in sequence from a catalog spec.  There 
are a limited and in fact quite small number of different make, break 
and stationary contact combs assembled in a finite number of 
combinations... not every possible combination as you speculate.  A 
small number of different contact actuating cards determine whether the 
contacts facing each other on opposite sides of a S contact operate with 
an EMB or EBM sequence.  These are assembled with one of a small number 
of different coils of specific resistance.  Thus for example there is no 
relationship between the characteristics of an AK4 and an AK6 based on 
the numberical value of the code.

There are long life versions of some WS relay types which are assigned 
codes starting with a high number series such as 2xx, 5xx or something 
of the kind.

Steph

Duncan Smith wrote:
> What is the numbering scheme for wirespring relays, or at least the AJ
> and AK series?  I think it's reasonable to expect that the numbering
> has some relation to whether each individual contact is absent, normal
> make/break, or early make/break (at least, I would number them that
> way).  Is there some sort of pattern, though?
>
> If each contact possibility is encoded in the part numger (early,
> normal, absent, for each of 20 contacts), there would have to be a
> maximum of 3,486,784,401 part numbers --- which is a bit excessive in
> my opinion.  Besides, all the relays I have access to at the moment
> have three- or four-digit numbers.
>
>