The emergency stop forms a functional supplement to the existing series of Schlegel control units. Due to its characteristic shape forming and its specific detail design it blends well with said ranges. The emergency stop features a foolproof snap-action mechanism and a key release (twist to reset). A green signal ring, which is covered during operation, serves as a switching position indicator. A ring-type LED lighting is integrated in the yellow anti-lock collar and makes the emergency stop not only well visible in the dark but also usable for any kind of optical signalisation.