Lennox 12J17 DPDT Normally Opening Sequencer Relay 24V

The Lennox 12J17 is a Sequencer Relay Normally Open, a component usually used with HVAC equipment, generally furnaces and air handlers. This small box works as a director for electrical current, deciding when and to which heater it should go next. As intended to operate in a wide variety of electrical frequencies of 50/60 Hz, it is suitable for most electrical grids. It enables a staged operation by controlling the timing of power delivery to heating elements. This means the furnace can start as low as the smaller stage and then build up to full power depending on the requisite, meaning a possibility of saving on power.