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)

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WAGO 221-612 | 2-Conductor Wire Connector | Pack of 50 | Compact, Tool-Free, Transparent – For Home, DIY & Industrial Wiring

WAGO 221-612 | 2-Conductor Wire Connector | Pack of 50 | Compact, Tool-Free, Transparent – For Home, DIY & Industrial Wiring

Product ID: 429724683

Details

Connector Type
Lever-nuts
Current Rating
41 Amps
Gauge
10.0
Mounting Type
Panel Mount
Number Of Contacts
2

⚡41A current rating

🔍Transparent housing for visual safety

🛠️Tool-free lever-nut design

428 kr

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Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Connect Like a Pro, Wire with Confidence!

POWER UP WITH 41 AMPS ⚡ - Handles heavy-duty wiring from 20 to 10 AWG effortlessly, perfect for your high-demand projects.
SAFETY FIRST ALWAYS 🔥 - UL Listed with fire hazard protection, ensuring your wiring is as safe as it is smart.
SEE IT TO BELIEVE IT 🔍 - Transparent casing lets you verify wire insertion instantly—no guesswork, zero errors.
NO TOOLS NO HASSLE 🛠️ - Innovative lever-nut design means quick, tool-free installation—save time and skip the frustration.
ENGINEERED IN GERMANY 🇩🇪 - Precision-crafted for durability and reliability, trusted by pros worldwide for flawless connections.

The WAGO 221-612 is a pack of 50 professional-grade, 2-conductor wire connectors featuring a compact, transparent, and tool-free lever-nut design. Rated for up to 41 amps and compatible with 20-10 AWG wires, these UL-listed connectors deliver reliable, safe, and error-free electrical connections trusted globally by electricians and engineers.

Specifications

ASIN	B07GR815JJ
Best Sellers Rank	#51,878 in Home Improvement ( See Top 100 in Home Improvement ) #204 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 4.8 out of 5 stars (868)
Gauge	10.0
Importer Contact Information	WAGO Private Limited, NH-08, Block 94 Vadsala, Block 1187 Varnama, Village Vadsala-Varnama, Vadodara, Gujarat-391243
Item Dimensions W x H	16W x 10H Millimeters
Item Type Name	Wiring Connector
Item Weight	0.39 Grams
Manufacturer	WAGO, WAGO
Manufacturer Contact Information	WAGO
Material Type	Copper
Model Number	221612
Mounting Type	Panel Mount
Number Of Contacts	2
Number Of Poles	2
Number of Items	50
Number of Packs	1
Number of Positions	50
Packer Contact Information	WAGO- LAKSHMI ENTERPRISES
Part Number	221612
Specification Met	UL
Unit Count	50 Count

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