[SI-LIST] Re: Latching relays in optical switches

>The problem is, the manufacturer disagrees and insists our circuit needs to be 
>redesigned to permanently tie one
>leg of the coils to GND and switch the high side instead. 

While that is more common, either should work.  Particularly since you have 
verified
the +5 rail is not moving, which indicates it is a good ground for all non-DC 
signals.

If you induce current in the other coil then the flux-linkage through the 
magnetic circuit
is kept minimal.  That will interfere with switching.

As for: 'They contend that having the 5V potential on the coil permanently is 
"interfering 
with the magnetic field".  I find this hard to believe, but physics was a long 
time ago.'  
That sounds like pseudo-scientific cruft.  You should find it hard to believe.  

HTH
Kevin
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