Abstract: A thermally activated initiator assembly uses a first bar that experiences a change in length as a function of temperature. The first bar is coupled to a first support. A second support is pivotally coupled to the first support and to the first bar so that the second support may move relative to the first support when the first bar experiences the change in length. An initiator is coupled to the second support adjacent to the high side of a ramp on the second support. A second bar is rigidly coupled to the first support. The second bar rests on the low side of the ramp prior to the first bar experiencing the change in length. When the first bar experiences the change in length, the second support moves relative to the first support causing the second bar to slide along the ramp until it falls off the ramp's high side to strike the initiator.