standard equipment 1 or 2 lifting speed electro-mechanical overload protection electronic safety device is also available up and down screw type limit switch efficient rope guide duty factors of motors: 60 (1 speed) and 4......standard equipment 1 or 2 lifting speed electro-mechanical overload protection electronic safety device is also available up and down screw type limit switch efficient rope guide duty factors of motors: 60 (1 speed) and 40/20 (2 speeds) lifting motors equipped with thermo probes ip 55 protection for motors and electrical controls f insulation for motors load hook with latch two speed or variable speed (frequency converter) on request suitable for ambient temperature - 20 +40.