A power-distribution panel comprising: a front circuit-breaker panel comprising a plurality of circuit breakers and a back-chassis interface having one or more bus power pins, and a plurality of distribution connectors; and a back chassis comprising: an aircraft interface configured to mechanically couple to an aircraft and configured to electrically couple to both a power-supply bus and a power-distribution harness of the aircraft; and a front-panel interface configured to receive and secure to the back-chassis interface of the front circuit-breaker panel, the front-panel interface having one or more power pin receivers through which power from the power-supply bus is provided to the front circuit breaker panel, the power pin receivers being configured to electrically connect to the one or more power pins and a plurality of distribution connectors delivering power from the circuit-breakers to the power distribution harness, separate from the one or power pin receivers, that are configured to electrically connect to the plurality of distribution connectors of the back-chassis interface; wherein the front circuit-breaker panel and the back chassis are configured to be secured together such that each of the plurality of circuit breakers is in electrical communication with the power-distribution harness in a first configuration state, and wherein the front circuit-breaker panel and the back chassis are configured to be mechanically separated from one another such that the front circuit-breaker panel is electrically isolated from the power-distribution harness and from the power-supply bus in a second configuration state. a front circuit-breaker panel comprising a plurality of circuit breakers and a back-chassis interface having one or more bus power pins, and a plurality of distribution connectors; and a back chassis comprising: an aircraft interface configured to mechanically couple to an aircraft and configured to electrically couple to both a power-supply bus and a power-distribution harness of the aircraft; and a front-panel interface configured to receive and secure to the back-chassis interface of the front circuit-breaker panel, the front-panel interface having one or more power pin receivers through which power from the power-supply bus is provided to the front circuit breaker panel, the power pin receivers being configured to electrically connect to the one or more power pins and a plurality of distribution connectors delivering power from the circuit-breakers to the power distribution harness, separate from the one or power pin receivers, that are configured to electrically connect to the plurality of distribution connectors of the back-chassis interface; an aircraft interface configured to mechanically couple to an aircraft and configured to electrically couple to both a power-supply bus and a power-distribution harness of the aircraft; and a front-panel interface configured to receive and secure to the back-chassis interface of the front circuit-breaker panel, the front-panel interface having one or more power pin receivers through which power from the power-supply bus is provided to the front circuit breaker panel, the power pin receivers being configured to electrically connect to the one or more power pins and a plurality of distribution connectors delivering power from the circuit-breakers to the power distribution harness, separate from the one or power pin receivers, that are configured to electrically connect to the plurality of distribution connectors of the back-chassis interface; wherein the front circuit-breaker panel and the back chassis are configured to be secured together such that each of the plurality of circuit breakers is in electrical communication with the power-distribution harness in a first configuration state, and wherein the front circuit-breaker panel and the back chassis are configured to be mechanically separated from one another such that the front circuit-breaker panel is electrically isolated from the power-distribution harness and from the power-supply bus in a second configuration state.