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What does AR stand for?

AR stands for Auxiliary Relay

This definition appears somewhat frequently

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We have 156 other meanings of AR in our Acronym Attic

Samples in periodicals archive:

Tenders are invited for i Maintenance Operation electrical installation and fans in old resdl colony at nh iv faridabad ii pdg electrical and mechanical work services for rli bldg at sec 47 faridabad iii moei and fans c l p set sstn dg set at gsi bldg nh v faridabad iv Maintenance Operation electrical installation and fans c l p set substation dg sets at niaw sikri ballabhgarh v Maintenance Operation electrical installation and fans sstn cl pset dg set at it and tc ssb faridabad sh servicing of ht ocb acb lt acb testing of ct s relays auxiliary relay and dehydration of transformer oil.
It has two on-board auxiliary relays, an internal 24 volt/4 amp power supply, and two notification appliance circuits.
In addition, the receiver provides four auxiliary relays to control other remote functions such as lighting, gates, and locks.