Perhaps the coolest feature of the WAGO 221 connector, however, is its clear design, allowing you to clearly see whether your wire is properly positioned inside the clamping compartment. Both even have guides on the nuts themselves for how far the wire needs to be stripped. The WAGO 222 series has a single recessed test point, while the WAGO 221 has two on each connector: one on the front and one in the back, under a lever. The levers are also designed to need less force to pry open and closed. First, these new connectors are much smaller-40% size reduction based on the 12 AWG type-saving space in crowded panels. The WAGO 221 series presents a number of important advantages over its predecessor. The one apparent advantage of the 222 is that it can accommodate a wider range of wires in one single package. What you won’t generally find in the generic form are the WAGO 221-style nuts, which have some very attractive features, even compared to the 222. Generic 222-style lever nut connectors can be found, but WAGO is such a leader in this space that the term “WAGO connector” is now applied as a general term. The 10 AWG version can work with between 20 and 10 AWG (.5-6mm²) and is UL listed for 600V and 30A. The 12 AWG version can work with wires between 24 and 12 AWG (.2 – 4mm²), and is UL listed for 600V and 20A. The 221 line comes in two different variations. Connectors are UL listed for 600V and 20A capacity. Note that higher numbers indicate thinner wire. The older 222 line accommodates wire between 28 and 12 AWG stranded or solid-core wires (.08 – 2.5mm²). Their blocks come in 2, 3, and 5 wire formats, in two different styles for their newer WAGO 221 series connectors. To use them, one simply has to strip wires to length, pull the appropriate connector lever up, push the wire in place, and flip the lever back down. WAGO pioneered lever nuts, receiving UL certification on the first such device in 2003. While you might think this is a necessary evil of the job, is there actually an easier method? A more reliable method? The answer to both is a resounding "yes," in the form of lever nut-style WAGO wire connectors.
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