induction disk relay

induction disk relay

[in′dək·shən ¦disk ′rē‚lā]
(electromagnetism)
A unit widely used in regulating and protective relays, in which alternating current applied to a coil produces torque to rotate a disk.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.