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What does AR stand for?

AR stands for Auxiliary Relay

This definition appears somewhat frequently

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Other Resources:
We have 156 other meanings of AR in our Acronym Attic

Samples in periodicals archive:

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.