Circuit breaker and power distribution system

A power distribution system comprising:

• a monitoring machine, a signal backplane, and at least two circuit breakers, wherein a central controller and a communications module are disposed on the signal backplane, the central controller comprises at least two control units, the signal interfaces of the at least two circuit breakers are electrically connected to the at least two control units in a one-to-one correspondence manner, and the communications module is electrically connected between the monitoring machine and the central controller;
• wherein each of the at least two circuit breakers comprises:
• a housing, which comprises a front panel and a rear panel that are disposed opposite to each other, wherein the front panel is disposed with a power wiring port, and the rear panel is disposed with a power interface and a signal interface, the power wiring port and the power interface are configured to be connected to a circuit of a power distribution system, to provide a main power circuit;
• and
• an internal element disposed inside the housing;
• wherein the signal interface is internally and electrically connected to the internal element, and the signal interface is externally configured to be electrically connected to a control unit disposed outside the housing;
• and a control signal of the control unit that is transmitted through the signal interface is used to implement working of the internal element.