What is a control that is self-limiting?

Answer 1

Your heartbeat. It beats on its own, and when it quits beating, you are limited to a few seconds of life.

Answer 2

An example of a self-limiting control is a thermostat on a heater. When the room temperature reaches the desired level set on the thermostat, the heater automatically turns off to prevent overheating. The control function is built in to limit its own operation once the desired outcome is achieved.