The RS 01 magnetic contact has been developed to allow to increase the insulation level of a door mechanism from IP20 (AS 03) up to IP67 and AtEx standard without needing to perform structural modifications. The contact is equipped with several reed sensors organized in order to command simultaneously the closure of two NO circuits only in the presence of the suitable PM 01 magnetic unit. The operation of RS 01 must be combined with the SB 01 safety board, which performs a synchronism check and assures the safety function. Up to 30 contacts can be connected in series to one safety board.