Abstract: A control circuit for manual forced control of a unit, this circuit including a manually operated switch of a non-locking type, to eliminate the need for visual examination. The switch returns to its initial state when the manual force applied to it has been ended. The control circuit includes a first switch having a first input for receiving a control pulse actuated by the use of the switch manually operated switch, a set input for receiving a set signal, an output connected to the unit which is to be controlled, changing its state to a predetermined set state in response to a set signal, changing its state in response to a control pulse, and remaining in the same state until a following control pulse or set signal is inputted.