Which of the following is a standard duty AC push-button rating?

• A. 3.0 Amperes, 120 Volts
• B. 1.5 Amperes, 240 Volts
• C. 0.75 Ampere, 480 Volts
• D. 0.6 Ampere, 600 Volts

Answer: (C)

Push-button contacts are rated for how much current they can safely handle at a given AC voltage. In standard-duty service, the ratings are set for typical control loads so the switch can handle everyday control tasks without excessive wear or arcing. The conventional standard-duty combination is 0.75 amperes at 480 volts AC, which reflects a safe, common baseline for small control devices handling higher voltages with modest current.

The other listed ratings either exceed what standard-duty ratings cover at those voltages or pair a higher current with a voltage where such a load would normally require a heavier-duty switch. They do not fit the typical standard-duty pairing, making the 0.75 A at 480 V the best representative choice.