[Phil Allison[_3_]]

"Patrick Turner"

Even the simplest thing you may want to do with 500Vdc needs careful
analysis and thought or else you'll end up with smoke and regrets. If
there is a choke involved in the 500Vdc rail, it makes matters worse
to design around it, and a suitable diode, say IN5408 may need to be
placed across the choke to prevent back EMF causing voltage across the
relay to go very high when contacts oen and DC flow is interupted.


** Putting a diode across filter choke defeats the choke's operation.



...... Phil