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)

Wago 221 612 2 Conductor Wire Connector Pack Of 50

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S/.202

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Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Connect smarter, faster, and safer—because your wiring deserves the best!

UNIVERSAL COMPATIBILITY - Works seamlessly with solid, stranded, and flexible copper wires from 20-10 AWG.
BULK PACK FOR PROFESSIONALS - 50 connectors per box—perfect for home, DIY, and industrial projects alike.
EFFORTLESS TOOL FREE WIRING - No screwdriver needed—just flip the lever and connect in seconds.
COMPACT TRANSPARENT DESIGN - See your connection clearly for peace of mind and space-saving installations.
ROBUST RELIABLE CONNECTION - UL-listed and rated for 41 amps, ensuring safe, long-lasting performance.

The WAGO 221-612 is a premium 2-conductor wire connector designed for quick, tool-free installation. Rated for up to 41 amps and compatible with 20-10 AWG solid, stranded, and flexible copper wires, its transparent housing allows visual confirmation of secure connections. UL-listed and made in Germany, this pack of 50 connectors is ideal for residential, commercial, and industrial wiring projects, delivering reliable, compact, and safe electrical connections every time.

Specifications

ASIN	B07GR815JJ
Best Sellers Rank	#31,961 in Home Improvement ( See Top 100 in Home Improvement ) #118 in Electrical Clamp Connectors
Brand Name	WAGO
Colour	transparent
Connector Type	Lever-nuts
Country of Origin	Germany
Current Rating	41 Amps
Customer Reviews	4.8 out of 5 stars 771 Reviews
Gauge	10.0
Item Type Name	terminals
Item Weight	0.39 Pounds
Manufacturer	WAGO, WAGO
Manufacturer Contact Information	WAGO
Material	Copper
Material Type	Copper
Model Number	221612
Mounting Type	Panel Mount
Number Of Contacts	2
Number Of Poles	2
Number of Positions	50
Packer Contact Information	WAGO- LAKSHMI ENTERPRISES
Part Number	221612
Specification Met	UL

Reviews

S**O

Fácil y sencillo para conectar

Muy cómodo para los conectores. No necesitas destornillador para engancharlos y se queda muy fuerte

8.03.2026

A**S

Einmal WAGO, immer WAGO

Hab ja mittlerweile testweise und interessehalber auch Produkte der Mitbewerber ausprobiert, aber an Wago kommen sie nicht heran. Der Klemmverschluss lässt sich gut öffnen und schliessen, ohne dass Fingernägel abbrechen. Auch sieht man gut, ob das Kabel auch ausreichend im Klemmverschluss ist. Da kann dann auch mal kräftig gezogen werden und es löst sich nichts. Bei den billigen grauen Dingern aus C…. Ist das oft nur ein Glücksspiel. Auch wenn ich immer Aderendhülsen nutze, ist es ein super Vorteil auch mal zwischen Litzen und starrer Ader mischen zu können.

23.11.2025

B**O

Wago T.C

Ottimi per collegamento Filo elettrico

9.01.2026

R**O

Much Easier than Wire Nuts

20.11.2025

S**E

Fantastic product

26.01.2022

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