The MC 447 magnetic contacts are designed for surface mounting on doors and windows to protect against unauthorised opening. For easy installation and safe operation they are equipped with wire guard screw terminals. The high quality reed contacts are gold-plated and coated with Ruthenium, which permits safe and reliable switching at very small currents and gives an extremely long life expectancy. They are designed for modern control units with a low loop current down to 1 microampere. The magnet is made of 'Alnico 5' alloy (aluminium-nickel-cobalt), which prevents demagnetisation and provides high stability of the magnetic field over a long time span.