Siemens have added a new compact 40 ampere basic unit to their Sitop modular power supply series. It is 150 millimeters wide, which is 90 millimeters narrower than the previous unit. The 20 ampere power supply is renewed and is 70 millimeters wide.
The two Sitop PSU300M standard mounting rail power supplies for connection to 3-phase 400 to 500 volt AC networks now have a wide range input (from 320 to 575 volt AC) than previous versions. This enables them to be used in 3-phase networks, and they also provide a 24 volt supply when there are large deviations in the voltage supply. The user now simply evaluates the DC 24 V OK operating mode through the new, integrated dry signalling contact.
The new 40 ampere power supply has small dimensions and now supplies 60 amperes for five seconds, so it can easily switch on terminal equipment with high starting currents. It reduces energy consumption and heat build-up in the control cabinet.
The new Sitop PSU300M standard mounting rail power supplies also have rugged metal enclosures. The Sitop PSU300M standard mounting rail power supplies can provide up to three times the rated current to meet short-term peak power demands. The short-circuit response can be set with options such as latching shutdown or constant current with automatic re-ramp up to the output voltage. Used in combination with Sitop add-on modules, protection can be achieved against primary and secondary disturbances.