MC 340-S12 is a universal magnetic contact with NC function that can be used in both alarm and access control systems for monitoring e.g. doors and windows against unauthorized opening. This set includes MC 340 and the plastic adapter set MC 300-S12 with a strong magnet enabling recessed installation with screw connection to door and window frames of steel, or in spaces where a larger operation gap is required. Both the contact and the magnet part are in a water proof (IP 67) plastic housing.