A sensor for devices such as mining machines, shaft-lining supports or extracting plants in underground mining, comprising a sensor device (15) disposed in a casing (11) and scanning measurements or variables and converting them into electric signals, also comprising a connecting element (26) in the form of a plug or socket fixed to the sensor casing (11) and adapted to be coupled to a receiving connection on the device and through which the sensor device (15) is supplied with the measurement or variable, and also comprising a flexible sheathed cable (1) comprising conductors (4) and a sheath (2), the sensor device (15) being electrically connectable via the conductors (4) to an evaluating device, in which the sensor casing (11) comprises a portion (13) with a cable insertion opening (20) to which the sheathed cable (1) is fastened in tension-resistant manner, wherein the conductors (4) are firmly connected through the cable insertion opening to the sensor device (15).