Inertia switch is to use electronic relays installed in the switch, inertia switch a switch circuit. Inertia switch into voice-activated inertia switch, light delay switch, touch-delay switch and so on. Principle of inertia switch is the principle of electromagnetic relays, relay works is, when the relay coil is energized, and iron core produces a powerful electromagnetic force in the coil, armature led Reed, disconnected contacts 1, 2, and 1, 3 through. When the coil heats up spring spring reset, connect contacts 1, 2, and 1, 3 disconnected. We just need to contact control circuit 1, 2 (1, 2, known as the normally closed contact) or between contacts 1 and 3 (normally open contact), the purpose of relay can be used to achieve some measure of control.