The magnetic contact MC 440 with 2 built-in resistors for a balanced circuit. When installing the magnetic contact it is easy to select if one resistor or both should be used (see wiring diagram). For quick and easy installation the magnetic contact comes with screw terminals with wire protection. It is equipped with tamper protection against unauthorized opening. The magnetic contact has a wide gap which allows for installation on most materials such as wood, plastic, aluminium and steel. Enclosed are plastic spacers for installation on steel. The contact can be supplemented with different accessories such as brackets and extra strong magnets. If additional spacers are needed use MC 400-6 and /or MC 400-7.