This is a terminal block for common circuits in which all terminals are electrically connected to each other.
It allows ground wires to be neatly consolidated in a compact manner.
It is a rail-mounted, Standard Screw type terminal block.
(The image is TNC10.)
Regarding the specifications not listed in the below chart, please check them at: KASUGA Terminal Block Product Search. Datasheets can be referred to from the retrieval page and CAD files can also be downloaded from the link in the result page.
