primary relay

primary relay

[′prī‚mer·ē ′rē‚lā]
(electricity)
Relay that produces the initial action in a sequence of operations.
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References in periodicals archive ?
Purple operates its business along two primary relay business units: Video Relay - which includes VRS, on-site interpreting, and video remote interpreting - and Text Relay.
Working closely with FKEC engineers and field personnel, TRC installed a new primary relay protection package for one of FKEC's radial transmission lines.