VR has various meanings in the NASA category. Discover the full forms, definitions, and usage contexts of VR in NASA.
A relay that turns on when a certain voltage in an AC circuit is reached. There are two basic ways that voltage relays work: detecting too much voltage and too little voltage. Voltage relays are used to find sudden jumps in voltage caused by a broken generator or low voltages caused by power outages or short circuits, among other things. It can also happen when any power tool is being charged.
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