273-104 is a piece of terminal block equipment manufactured by WAGO, a German company. It is made of a thermoplastic, is rated for up to 250 volts, and has a maximum of 8 pins. The terminals are numbered and each terminal can accept different wire sizes, ranging from 0.2 mm2 up to 2.5 mm2. There is a label around each terminal indicating the number of the terminal and the wire size range accepted. It can be used for screw connections, insulation piercing connections, and push-in connections.