The 111 model brakes function as power-on engaged, which means it halts and holds position when energized. As voltage is applied to the stator coil, the armature and stator friction surfaces connect and halt rotation. This particular model features three different armature types, to be determined by your choice of mechanical output.
The main difference between the 111 and the BSZ brakes is that the 111 offers three different armature styles and no integrated bearing.