Magnasphere's TW series is used in the security industry for door and window sensors in closed loop alarm systems. It has a wider actuation zone in the X or Y axis than other Form A Magnasphere switches. Its robust, all-metal construction is highly resistant to magnetic tamper and defeat as well as permanent contact welding from power surges.
The basis of the technology is a magnetic sphere or ball contact housed in a durable metal housing. Completing the switch is a seal that contains the contacting electrode, which is insulated from the metal perimeter by a ceramic-to-metal bond. The case or seal provides the second contact point required to complete the electrical circuit. The seal/electrode cap is welded to the housing in an inert atmosphere, providing a hermetically sealed contact. Post-assembly magnetizing activates the magnetic properties of the contact.
