My box of Wago connectors has one of the larger sides completely covered with listing information.
The UL lable says they're rated for 600v, 28-12 wire. I take this to mean the connectors can carry any current #12 wire can carry.
Other agency listings have amp ratings as low as 20 amps and as high 32 amps.
Sparky, I think that either you are looking at the wrong product (perhaps one made for connecting a lamp ballast?), or you misread the marking. The "4" you saw most likely refers to the maximum wire size of 4mm (#12).
