Transfer units GN 391 are normally used in connection with linear actuators (GN 291, GN 292, GN 293). They are designed to transfer the rotary movement for operating the linear actuators to another or a further position. The transfer unit in the standard length l1 is a special design: It is designed to turn the operating axis for the linear actuators (handwheel) by 90° together with an angular gear. As in linear actuators, digital position indicators can be fitted.