Avoid electrical overload and prevent broken circuits in your equipment and machinery with an electric sequencer. These useful devices help stabilize circuits and quickly turn electrical switches on and off. Sequencers are particularly useful in controlling heating elements in a furnace. While building safety experts and HVAC professionals can recommend and install the sequencer that would work best in your building or HVAC system, as long as you know the dimensions and specs, you can do the installation yourself. Shop for more HVAC and appliance controls like thermostats, sensors, monitors, guards and more.