Due to its operating principle, the BRÜHL-SN-F cam system is used exclusively for swing and double doors. This attachment system is very advantageous when very fast plant access is required. This system is combined with two roller plunger switches (type 1) from the companies Bernstein, Euchner, Rockwell Automation, Schmersal or Siemens, which serve a safe two-signal interrogation, which can have a positive effect on the performance level or on the safety category in the context of the risk assessment.