Abstract: An electric control (1) for electric devices (2), in particular electromotive drives, which can trigger dangerous motions, is provided with an emergency-off switch (4), having at least two channels for a power supply, allowing one or more electric devices (2) to be connected at the outlet side. One safety unit (3) is provided with at least one connector (5) for a power supply as well as at least two outlets (6, 7) for connecting one channel (A, B) each of the emergency-off switch (4). The safety unit (3) has at least two switches (8, 9) connected to the outlets (6, 7), via which the power supply is conducted and switched on and off alternately. Furthermore, a measuring device (10) is provided for controlling at least the supply power pulses at the outlets (6, 7) of the safety unit (3) and/or at the outlets of the emergency-off switch (4) and/or at one or more electric devices (2) connected to the emergency-off switch (4).