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Your electric furnace is not going to be able to do you much good without your contactor. You will need this in order to keep the temperature in your home nice and comfortable during the winter season. Sequencer. A sequencer used on an electric furnace is something that will turn your heating elements either on or off. It can do this to more than one should this be necessary. A sequencer is needed because it helps to keep the current spike that is electric down. This is something that can happen whenever your electrical device becomes energized in any way. It does not take much for your electrical device to become energized.
Each of the elements usually are 5 kilowatt and the furnace may have from 2 to 6 of these elements. The elements are controlled by contactors or sequencers which turn the elements and the circulating fan on. The video below gives an overview of how the electric furnace heat strip is put together. Below is a demonstration of the elements sequencing on and off. Electric furnaces use high temperature limits as as safety to shut off the elements if the temperature exceeds a preset number.