Siemens Automation and Drives (A&D) is supplementing its 'Sitop modular' series of power supply units with a 20-ampere basic unit for connection to the 3-phase 400/500 V a.c. power supply. Only 70 mm wide, the new DIN-rail-mounted supply unit takes up less than half the space of its predecessor when installed. The 24 V power supply unit, one of the narrowest and most compact in its performance class, is characterised by its high efficiency of 93%, which results in very low heat losses.
The modular Sitop power supply unit from Siemens
Like the other basic Sitop units of the modular series, the new 20 A version has a robust metal housing. It comes with extensive functions for a wide variety of requirements such as short-time power boosting with up to three times the rated current or adjustable short-circuit behaviour where it is possible to choose between latching OFF and constant current with automatic restart of the output voltage. As a new function, the DIN-rail-mounted unit can supply 50% extra power for five seconds. This makes it possible to switch in loads with a high power-on current such as DC/DC converters and motors without any difficulties.
The new DIN-rail-mounted power unit can also be combined with the extensive range of Sitop add-on modules. Complete all-round protection can be provided: for example, protection against mains failure or selective protection against short-circuit or overload in the 24 V output circuit.
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