The Emerson 57T01-843 time delay relay is for designed for use in air handlers installed in compressor-run air conditioners and heat pump systems. This relay is used to delay the blower shut-off after the compressor shuts off. This relay can also be used to delay the blower shut-off in heating, depending on electrical hookup in a heat pump system.

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For use in air handlers installed in compressor-run AC and heat pump systems
Delays the blower shut-off after the compressor has shut off
Increases the cooling efficiency of the system by letting residual cooled air to be blown into the controlled space
On delay: 2 Sec, off delay: 80 Sec
Plastic standoff mounting