Power distributor with a number of lined up power distribution modules (4, 6, 8), with a feed module arranged on a front end and with an oppositely arranged signal module and with at least one connection module arranged therebetween, - wherein the feed module comprises a feed terminal for a main power line for tapping a feed current, - wherein the connection module is or can be equipped with an actuable circuit breaker and comprises a number of load terminals (126a, 126b) for connection to a load circuit that is interruptable by means of the circuit breaker, - wherein the signal module comprises a first signal terminal for a switching signal actuating the circuit breaker, and - wherein the power distribution modules (4, 6, 8) are electrically conductively coupled to each other or can be coupled characterized in that the power distribution modules (4, 6, 8) are designed for direct mounting on a support rail, and that a switching signal line formed by the power distribution modules (4, 6, 8) is provided for carrying the switching signal, - wherein the feed module comprises a second signal terminal for feeding the switching signal, - wherein the connection module is electrically conductively coupled to two signal contacts (116, 120) of the circuit breaker, - wherein the circuit breakers of several lined up connection modules are connected in series with respect to the signal contacts (116, 120), - wherein the switching signal can be tapped at the first signal terminal of the signal module, and - wherein the power distribution modules (4, 6, 8) are cross-wired among each other in a row direction in an electrically conductive manner by means of first contact elements (62, 140, 84, 182, 186) from housing end face to housing end face. - wherein the feed module comprises a feed terminal for a main power line for tapping a feed current, - wherein the connection module is or can be equipped with an actuable circuit breaker and comprises a number of load terminals (126a, 126b) for connection to a load circuit that is interruptable by means of the circuit breaker, - wherein the signal module comprises a first signal terminal for a switching signal actuating the circuit breaker, and - wherein the power distribution modules (4, 6, 8) are electrically conductively coupled to each other or can be coupled characterized in that the power distribution modules (4, 6, 8) are designed for direct mounting on a support rail, and that a switching signal line formed by the power distribution modules (4, 6, 8) is provided for carrying the switching signal, - wherein the feed module comprises a second signal terminal for feeding the switching signal, - wherein the connection module is electrically conductively coupled to two signal contacts (116, 120) of the circuit breaker, - wherein the circuit breakers of several lined up connection modules are connected in series with respect to the signal contacts (116, 120), - wherein the switching signal can be tapped at the first signal terminal of the signal module, and - wherein the power distribution modules (4, 6, 8) are cross-wired among each other in a row direction in an electrically conductive manner by means of first contact elements (62, 140, 84, 182, 186) from housing end face to housing end face.