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The 'kVA' rating in a three-phase system represents apparent power, which is a combination of active power (measured in kW) and reactive power (measured in kVAR). Apparent power reflects the total amount of power flowing in the circuit, both the power that performs useful work and the power that is used to establish electric and magnetic fields in inductive and capacitive components.

In a three-phase system, the kVA rating is particularly important because it provides a measure of the system's capacity to supply power without taking power factor into account. This means it is a straightforward way to express the power-handling capability of equipment, transformers, and generators. It is essential for electrical engineers and electricians to understand kVA because it helps them assess how much load can be safely connected to a system.

While voltage supply, power per phase, and current output are critical parameters in electrical systems, they do not directly represent the total capacity of a system like the kVA rating does. This understanding helps ensure proper system design, load calculations, and equipment selection in various electrical applications.