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Voltage or current signals that are not at the desired 50Hz fundamental frequency, but are at some multiple frequency, such as the third harmonic, 150Hz and the fifth harmonic, 250Hz. Excessive harmonic voltages can have serious effects on modern equipment power supplies and may cause overheating.

Harmonic Distortion
Excessive harmonic (a frequency that is a multiple of the fundamental frequency) content that distorts the normal sine wave.

Part of a UPS that converts the dc into ac power.

Thousand VA.

Any electrical device connected to a power source is a “load”. For a UPS, the load is the amount of current/power required by the attached electronic equipment.

MOV – Metal Oxide Varistor
A voltage clamping device capable of absorbing very large currents without damage.

Any undesirable electrical signal.

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