A power distributor having a plurality of power distribution modules arranged in a row, for directly mounting on a carrier rail, having a supply module arranged on one end face and a signal module arranged on the opposite end face, and having at least one connection module arranged therebetween. The supply module has a supply connection for a main power line for tapping off a supply power. The connection module is fitted or can be fitted with a protective switch that can be actuated and a plurality of load connections for connecting to an interruptible load circuit by means of the protective switch. The signal module has a first signal connection for a switch signal actuating the protective switch, and the power distribution modules are or can be coupled to each other in an electrically conductive manner.