Siemens 6GK1900-0MB00-0AC0 Automation Connection Component. Siemens 6GK1900-0MB00-0AC0 is the exact manufacturer order number for a automation connection component in the SIMATIC NET PC Communication portfolio. Siemens describes this exact reference as: IE SC RJ POF plug Screw connector for on-site Assembly to POF FOC cables (packing unit 20 duplex plug). The verified manufacturer lifecycle record is PM300: Active Product.