vacuum relay

vacuum relay

[′vak·yəm ′rē‚lā]
(electricity)
A sensitive relay having its contacts mounted in a highly evacuated glass housing, to permit handling radio-frequency voltages as high as 20,000 volts without flashover between contacts even though contact spacing is but a few hundredths of an inch when open.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
One such switch is made by Kilovac Corporation and amounts to a vacuum relay. Even though fairly small (2-inch diameter) these relays are rated for 25,000 volts and 30 amps making them appropriate for most loop applications.