There are obvious differences between open nose and closed nose in shape and usage scene. The shape of the open nose is only pressed once, and the number in the model indicates the current.

The silk-closing nose, also known as the oil-blocking copper nose, has a certain oil-blocking effect. If used for wiring, wires and cables need to be below 10 square meter, which is too small to be used. The numbers in this series indicate the meaning of conductor cross section.