2-pole sequencer controls the sequence in which the heating elements & blower turn on. This one has the ability to control up to 1 blower and 2 heating elements. Timings are H1-110, C1-110.
Replaces 309508, 3400-3561, 3400-356 & 3110-357.
Also used in some Nordyne E1 and E2 series furnaces that use a single-tower sequencer.