Negligent assembly or a mechanical damage is always a possibility with pushbutton assemblies.  With emergency stop buttons, the contact block must be accurately connected or the button will not work as required. The safety contact blocks manufactured by Schlegel can solve this potential problem. In such a situation, they ensure that the emergency function is activated and the installation is switched off immediately. It can only be restarted after successful trouble-shooting. The contact blocks are available with screw connections or Faston terminals and have positive opening contacts acc.to IEC60947- 5-1.