Latch Release with 1.5 pounds of force using shape memory alloy wire. This was used as a payload release mechanism for a large military drone.
This is the payload release on a life-cycle test fixture. Cycling against a 2-pound spring, powered by a 9V Duracell Lithium battery. An Arduino-based controller provides power for 0.150 seconds, then resting for 10 seconds before repeating. The onboard MOSFET switching and protection circuit senses the End Of Stroke position, and cuts power to the SMA wire to prevent overheating.