Is the 221 series rated for aluminum?

I do not believe so, I believe you could use the 222 series with the WAGO contact paste - you would need to verify. The issue is always the chemical reaction that can cause a fire when aluminum, copper and moisture is involved. Not a fan of mixing the two types.

box above shows ul listed, etc, but then says "do not work.inder load!". at some point the power(load) has to be turned on, so what does that mean?

I used these lever nuts to power a 6,000 watt dr heater using a 10 gauge solid wire. The plastic gets a little warm. The lever sometimes lifts a little. See that it’s always down. I don’t recommend using these lever nuts where you can’t see them, like behind walls. ‘Do not put under load’ has #1 footnote. I don’t have the box anymore. I can’t tell you what that footnote is.

Can i use these on 12-2 wire?

Yes it will work with 12-2 wire I really prefer to use these when ever I can.

Is there a trick to opening the tabs? Mine will not open at all.

No trick to open. Mine lifted up easily enough and work great. Hold one side in your hand and lift the end of the other side tab where the wire goes into the connector. Make sure that you are lifting only the yellow tab and not catching on the clear edge of the connector under the tab. If necessary - use a flat edge to slip under the tab vice your fingernail for more leverage. (Like a screwdriver)

Gauge	10.0
Contact Material	Copper
Material	Copper
Brand	WAGO
Temperature Rating	257 degree fahrenheit
Product Dimensions	0.83"L x 0.63"W x 0.4"H
Manufacturer	WAGO
Part Number	221612
Item Weight	5.9 ounces
Item model number	221-612
Size	Pack of 50
Item Package Quantity	50
Batteries Included?	No
Batteries Required?	No

Wago 221-612 Lever-Nuts 10AWG 2 Conductor Compact Wire Connectors 50 PK

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