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Re: SPDT High Voltage Switch
Original poster: David Speck <Dave@xxxxxxxxxxxxxxxx>
Probably the best approach would be a SPDT vacuum relay. These come
up regularly on eBay, and are available in a variety of voltage and
current ratings. The military ones are rated at 26.5 volts, but
usually work on 24 V without complaint. Patience is a great virtue
in this search, as sometimes, they go for next to nothing, and other
times, identical pieces bring crazy prices. Try searching for
"vacuum switch*" or "vacuum relay*"
Connect the center switch connection to the grid, the normally closed
terminal to ground, and the normally open terminal to the 25 kV supply.
If you are concerned about reliability, you can use two separate
relays in parallel. Then, either relay could ground the grid if the
I assume that there is not a lot of capacitance on the grid
system. If there is, you might need to put a current limiting
resistor in series with the ground path to keep the discharge current
within the ratings of the vacuum relay.
Tesla list wrote:
Original poster: <alderhood@xxxxxxxxxxxxx>
I am looking for a failsafe switch that can switch a grid between
the 25Kvac power supply and ground. We are talking about very small
amperages .The switch will be functioning as a safety to protect
maintenance people and not for control purposes. I need for it to
have a coil preferably 24VAC that will cause the grid to shift to
ground on de-energizing. It seemed to me that this was simple at
first but I may have too many trees blocking my vision of the
forrest. A little help please and contact me directly as well as on the list.