Latch with rotary SMA actuator

A rotary actuator includes a plurality of plate members stacked and coupled together for rotation relative to each other. A biasing member provides a biasing force tending to cause a rotatable end plate member to rotate in a biasing direction relative to a non-rotatable end plate member. Each plate member has a plurality of notches at its periphery. A SMA wire extends through the plurality of notches so that as the SMA wire is heated, the SMA wire rotates each rotatable plate member from a cold position in a direction opposite the biasing direction to a hot position. As the SMA wire cools, the biasing member rotates each rotatable plate member in the biasing direction from the hot position and returns each rotatable plate member to the cold position.