Siemens logo power stabilised din rail power supply 1 phase siemens 6ep1311 1sh03 the siemens logo 6ep1311 1sh03 is a primary switched mode power supply for connection to a 1 phase ac system or to dc system the output of the device is isolated no load proof and short circuit proof the led display indicates the operating status the 5v dc 3a 19w power supply is perfectly suited for low installation applications such as in a distribution box thanks to its flat stepped profile the power