If I understand correctly, you are replacing a switch that has a black and red wire?
And your new switch has 2 black wires + green wire
The green is color-code for ground, and it always connects to bare ground wire.
The switch wires are not color-coded (both are black) so they can connect to either of the two wires that came off old switch.
If switch does not operate, they try reversing the two black wires.
As a general rule, the wires inside your box are color-coded.
The color-code information says:
The black is the Hot from breaker box. This wire carries electricity from the breaker to the switch.
The red wire goes to Load (fan, light, motor). This wire carries electricity to the Load when you turn ON the switch.
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