Rittal Power System Module PSM module with 4 x C19 sockets for plugging in a Rittal PSM rail. The module occupies a slot on the rail. Up to 7 modules can be installed in a 2 m PSM-rail and up to 4 modules can be installed in a 1.2m rail. A mix of different modules is possible. Coloured LEDs on the module show the current load. Up to 7 A. the LEDs in green and up to 13 A in yellow. With increasing concentration of power to more than 13 A, the LEDs light up in red to indicate that no further load should be connected. This thresholding can not be changed.