A terminal block assembly comprising: a chassis ; a plurality of terminal blocks releasably supported within the chassis , each of the plurality of terminal blocks comprising: an insulating block composed of an electrically insulating material, the insulating block comprising: a rear surface ; a first surface located at a first spatial position from the rear surface ; a second surface located at a second spatial position from the rear surface , wherein the second spatial position is located at a smaller distance from the rear surface than the first spatial position; a third surface extending between the first surface and the second surface ; a first electrical conducting element extending between the rear surface and the first surface ; and a second electrical conducting element extending between the rear surface and the second surface, wherein the first and second electrical conducting elements are separated from one another by a portion of the insulating block ; and a plurality of removable partition barriers that electrically insulate the plurality of terminal blocks from one another, each being supported by the chassis and disposed between adjacent terminal blocks . a chassis ; a plurality of terminal blocks releasably supported within the chassis , each of the plurality of terminal blocks comprising: an insulating block composed of an electrically insulating material, the insulating block comprising: a rear surface ; a first surface located at a first spatial position from the rear surface ; a second surface located at a second spatial position from the rear surface , wherein the second spatial position is located at a smaller distance from the rear surface than the first spatial position; a third surface extending between the first surface and the second surface ; a first electrical conducting element extending between the rear surface and the first surface ; and a second electrical conducting element extending between the rear surface and the second surface, wherein the first and second electrical conducting elements are separated from one another by a portion of the insulating block ; and an insulating block composed of an electrically insulating material, the insulating block comprising: a rear surface ; a first surface located at a first spatial position from the rear surface ; a second surface located at a second spatial position from the rear surface , wherein the second spatial position is located at a smaller distance from the rear surface than the first spatial position; a third surface extending between the first surface and the second surface ; a rear surface ; a first surface located at a first spatial position from the rear surface ; a second surface located at a second spatial position from the rear surface , wherein the second spatial position is located at a smaller distance from the rear surface than the first spatial position; a third surface extending between the first surface and the second surface ; a first electrical conducting element extending between the rear surface and the first surface ; and a second electrical conducting element extending between the rear surface and the second surface, wherein the first and second electrical conducting elements are separated from one another by a portion of the insulating block ; and a plurality of removable partition barriers that electrically insulate the plurality of terminal blocks from one another, each being supported by the chassis and disposed between adjacent terminal blocks . <EOS>