2 Pole side mounted auxiliary contact block fitted outside CAL18-11, with screw terminals. The CAL18-11B auxiliary contact block is used for the operation of auxiliary circuits and control circuits for standard industrial environments. For clipping onto the right- and/or left-hand side of the contactors. The CAL18-11B is a second block for mounting in addition to a first CAL18-11 block, right- and/or left-hand of the A145 to A300 contactors. It is equipped with screw type connecting terminals delivered open, protected against accidental direct contact and bear the corresponding function marking.