Siemens din rail interface module 3tx7004 series siemens 3tx7004 1lf00 the siemens 3tx7004 1lf00 is a din rail interface module in a two tier design from the 3tx7004 range the interface has a screw connection ideal for galvanic isolation signal amplification overvoltage and emc protection of controls siemens 3tx7004 1lf00 interface module