rated voltage vs voltage

rated voltage and voltage both are nouns.

Word	Noun	Adjective	Verb	Adverb
rated voltage	Yes	No	No	No
voltage	Yes	No	No	No

As nouns, voltage is a hypernym of rated voltage; that is, voltage is a word with a broader meaning than rated voltage:

rated voltage: the maximum voltage that the circuit-breaker can interrupt safely and without being damaged by excessive arcing.
voltage: the difference in electrical charge between two points in a circuit expressed in volts

Other hypernyms of rated voltage include electric potential, potential, potential difference, potential drop.

rated voltage (noun)	voltage (noun)
the maximum voltage that the circuit-breaker can interrupt safely and without being damaged by excessive arcing.	the difference in electrical charge between two points in a circuit expressed in volts
	the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts