Methods, systems, and apparatus for circuit breakers with integrated safety, control, monitoring, and protection features. In one aspect, a circuit breaker includes an input and an output, a switch coupled between the input and output, a communications device configured to communicate on a data communications network, and a control system coupled to the switch and the communications device, wherein the control system is configured to perform operations including opening the switch as a consequence of detecting an overcurrent condition in a circuit downstream from the circuit breaker, opening and closing the switch based on one or more instructions received by the communications device from the data communications network, and monitoring the power consumption of the circuit downstream from the circuit breaker.