The Siemens Industry Automation Division has expanded its Sitop smart series of power supplies with a 24V unit with 3-phase connection. The Sitop PSU300S is designed for standard regulated 24V direct voltage requirements for machinery and plants. The new power supply unit with adjustable output voltage from 24 to 28 volts features a wide-range input from 340 to 550 V AC and supplies 20-ampere rated current.