Siemens sitop psu300b din rail power supply psu300b range siemens 6ep1437 3ba20 p the siemens 6ep1437 3ba20 is a din rail 3 phase power supply from the sitop psu300b range the most distinctive feature of the 30a power supply is that it has been optimised for battery charging p p the 3 phase wide voltage input range 320 575v ac means the sitop psu300b can be used worldwide it is compact in design and ideal for automated machines and systems the output of the device is isolated n