Attributes . Standard 115-VAC models: 115-VAC, 60-Hz external power supply; Standard 240-VAC models: 240-VAC, 50-Hz external power supply with IEC power connector; Hardened and Extreme AC models: 100–240-VAC, 47–63-Hz external power supply; 12-VDC models: Internal terminal block for 12-VDC power plus jack for AC power supply (not included); 24-VDC models: Internal terminal block for 24-VDC power plus jack for AC power supply (not included); 48-VDC models: Internal terminal block for 48-VDC power plus jack for AC power supply (not included) . Names