New power supplies from Siemens offer high efficiency and power density
02 December 2010
Compact, efficient and powerful – these are the three key features of the new three-phase Sitop PSU300S power supplies and the single phase Sitop PSU100C device versions from Siemens. The narrow footprint of the power supplies only requires a small mounting area. And thanks to their high efficiency, the new models consume less energy and generate less waste heat.
The Siemens Sitop Smart power supply line has been extended by two new versions of the Sitop PSU300S power supply for three-phase mains connection. To complement the already available power supply with a 20A rated current, the new versions offer 10 and 40A rated output currents. The 10A power supply comes in a metal enclosure just 90mm wide. The 40A device requires a 145mm space on a DIN rail. The compact size is achieved through the high efficiency of more than 91 percent, which reduces the development of heat and makes a voluminous heat sink superfluous.
The Sitop PSU300S power supplies are optimised for standard requirements in automated machines and plants which require a stabilised direct voltage of 24V. The high-performance power supplies can deliver 1.5 times the rated current for five seconds, such as during the start up of loads with a high current demand.
An integrated signalling contact enables a controller to evaluate the operating state of the power supply as a "24V O.K." statement. The power supplies can also be combined with redundancy modules, selectivity modules and DC UPS modules (uninterruptible direct current power supply).
With their three-phase wide-range input for alternating current from 340 to 550V together with comprehensive certification for all standard applications, the PSU300S devices have been designed for use throughout the world.
Siemens has also added three higher-output versions of the single phase Sitop PSU100C power supply to the Sitop Compact power supply line. The two 24V versions supply 2.5 and 4A rated output currents respectively, the 12V version has been designed to deliver a 6.5A rated output current.
With overall widths of only 45 and 52.5mm, the new Sitop power supplies are especially suitable for decentralized use in the lower power range of up to 100W, such as installation in switch boxes and small control cabinets. Like all the models in the product line, the new DIN rail devices are characterized by high efficiency throughout the entire load range and low no-load losses of less than 1W.
The wide-range input facilitates connection to single phase alternating current networks with voltages of 120 and 230V, or to direct voltage networks with voltages between 110 and 300V. Detachable clamp-type terminals allow the use of pre-assembled wiring and make it easy to exchange devices. The power supplies are suitable for universal use in an operational temperature range from -0 to +70 degrees Celsius.
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