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Altech Foot Switches with Safety Lock Plus Manual Release. Pedal pressed up to pressure point: The make contact is closed and the work process is started. Pedal presed beyond resistance of the pressure point in an emergency situation: The make contact is interrupted and locked, the work process is interrupted. In this phase the lock remains in the Off position even when the pedal is not pressed. This reliably prevents uncontrolled restart of the machine or moving parts. Relese: Only after the ha