The main feature of the 2273 series is the transparent housing, which allows the electrician to visually confirm whether the conductor has been properly inserted and stripped to the correct length. In addition, they have a special test port at the back, allowing the use of measuring instruments without disconnecting the wires. Their design is optimized for junction boxes with a high load of cables, as their small size facilitates organization and management of the installation, while the color coding (orange for the 3-position version) helps in the immediate identification of the terminal block type.