Siemens adds 40A model to Sitop modular power supply series

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Siemens's Industry Automation Division is adding a new compact 40A basic unit to its Sitop modular power supply series. At only 150mm wide, it is 90mm narrower than the previous unit. The 20A power supply has also been renewed and is only 70mm wide.

The two Sitop PSU300M standard mounting rail power supplies for connection to three-phase 400-500V AC networks now have a wider range input (from 320-575V AC) than previous versions. This enables them to be used in almost all the world's three-phase networks, and they provide a reliable 24V supply even when there are large deviations in the voltage supply. Users now simply evaluate the ‘DC 24 V OK’ operating mode via the new, integrated dry signalling contact.

This new 40A power supply is a substantial improvement on the previous model. Apart from its small dimensions, the power unit now supplies 60A for five seconds, so it can easily switch on even terminal equipment with high starting currents. Its efficiency of up to 93 per cent reduces energy consumption and heat build-up in control cabinets.

Like all Sitop basic units in the modular series, the new Sitop PSU300M standard mounting rail power supplies also have rugged metal enclosures. They can provide up to three times the rated current to meet short-term peak power demands. Moreover, the short-circuit response can be set with the options: latching shutdown or constant current with automatic re-ramp up to the output voltage. Used in combination with Sitop add-on modules, comprehensive protection can be achieved against primary and secondary disturbances.

Further information can be found on the internet at

28 November 2008

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