Abstract: A momentum activated electrical switch. A cylindrical switch body has a movable mass therein constrained to move between a first end, the off position, and a second end, the on position. The movable mass is formed from a magnet and both ends are provided with a ferrous material to provide a force that detains the magnet in position at each respective end until deceleration and momentum moves the magnet to the opposite end. The second end is formed from a non-magnetic and electrically non-conducting material have two (2) ferrous electrically conducting rods that extend therethrough. When the magnet is formed from a non-conducting composition, the face adjacent the second end is provided with a disk of electrically conducting material that completes the circuit.