A switching device that rapidly recloses a power switch after it has been opened by an overload. In reclosing the power feed to the line, the device tests the circuit to determine if the problem is still there. If not, power is not unnecessarily interrupt
The average value of the instantaneous product of volts and amps over a fixed period of time in an AC circuit.
A component of apparent power (volt-amps) which does not produce any real power (watts). It is measured in VARs volt-amps reactive.
The opposition of inductance and capacitance to alternating current equal to the product of the sine of the angular phase difference between the current and voltage.
Residual Current Device. A protection device which is actuated by the residual current.