Grade 2 Non-Resistored Surface Contact, Aluminium - 

This heavy duty surface mounted magnetic contact can be used in most security systems up to grade 2 as specified in EN50131-1 and is compliant with EN50131-2-6 and environmental class II (for use indoors). It operates as a normally closed circuit going open when the magnet housing is moved away from the contact housing. This contact can be used on doors and windows to detect the unauthorised entry of an intruder. A number of applications are shown over. The contact is sealed to prevent access to inside of the unit.