Which of the 4 screws are power/ground and in/out? They are not labeled.

I believe you want to know which terminal is power and neutral. Ground is not connected to any terminal, ground would be connected to the frame of the enclosure. This is an AC device, not DC. If you look on the printed circuit side of the board you will see one wire trace goes directly from one terminal to another terminal and no place else, those are the two neutral terminals. Refer to the diagram for line (input) and load (output) terminals.

How do i wire this for 110? there is an in-n, in-l, out-l, out-n. i connected this on the hot leg to the in-n and out-n. fan runs but no speed change

I used mine for varying the speed of a series wound "universal" motor. A motor with brushes and commutator. It worked to vary the speed. I wired it with the two terminals closest to the heat sink to the 110 the two closest to the variable resistor to the motor.

Will this work to dim some 500w halogen work lights?

I think the answer would be "yes" with some constraints. "Yes" in that my experience has been it overheats at half the 2000 watt rating, but 500 watts should be OK. You should read up on halogen bulbs because unlike tungsten filament bulbs, halogens need to be operated at a certain minimum temperature. You should be able to dim them down to about 70% duty cycle as long as you also operate them at 100% for substantial periods at other times. Otherwise, I think you may have some condensation of tungsten on the glass tube surface. But as far as the wattage is concerned, this device should be ok t 500 watts. If you exceed its capacity it will have thermal shut down until it cools off. You won't have a huge investment if you decide to try it -- either in the PWM device or the tungsten bulbs. Just make sure you don't go below 70% duty cycle and check the bulb surface from time to time for evidence of metal deposits (silvering) and run at 100% duty cycle for a time to remove it. Good luck.

Will this work in a led dimming circuit, between the ac mains and a dim able led driver?

"...LED's do not work with AC current" That is not true. Yes an LED is a diode and only conducts in one direction but that doesn't mean that it won't light up if hooked to an AC source. It will act like any diode and will only conduct on one half of the AC cycle. The 2 things to be considered are: 1. What is your "dim able led driver"? Is it meant to be driven by standard AC house current? If so, you're good to go. If it's expecting DC, then it might work but will only work with one half of the AC cycle. 2. The LED may produce light that is strobing at 60 cycles since it's off half the time. Not good for lighting. Great for headaches. Bottom line get a standard light dimmer switch.

Display Type	LCD
Operating Temperature	40 Degrees Celsius
UPC	797698770512 711274517940
Manufacturer	HiLetgo
Part Number	3-01-0110
Item Weight	1.44 ounces
Product Dimensions	1.38 x 1 x 1.85 inches
Item model number	3-01-0110
Is Discontinued By Manufacturer	No
Size	Small
Shape	Square
Power Source	Electric
Wattage	2000 watts
Special Features	Dimmable
Usage	Heater
Batteries Included?	No
Batteries Required?	No

HiLetgo 2000W PWM AC Motor Speed Control Module Dimmer Speed Regulator 50-220V Adjustable Voltage Regulator

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