Abstract: A fiber optic magnetic switch device comprising a fiber optic transceiver ving a light source and a length of fiber optic cable for transmitting light to a fiber optic magnetic switch. The switch includes a magnet, a position biased shutter operably attached to the magnet, a pair of SMA type connectors positioned to align the shutter there between, a repelling orientation magnet positioned proximate the shutter to orient the shutter in a first, secured repelling orientation to allow light through the shutter and further operable to prevent passage of light through the shutter in a second, unsecured condition. An alarm signals the failure of light to be transmitted along the fiber optic cable and through the shutter. Alternatively, the device may include a second fiber optic cable operable between the transceiver and the alarm during operation of the device and positioned to activate the alarm upon interruption of light transmission therein such as when it is tampered with.