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 (108, 110) 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 (108, 110) 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 (108, 110) 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.