Power management and distribution with auxiliary DC bus

A power management and distribution (PMAD) system includes a main DC bus 18, an auxiliary DC bus 20, a power converter 12, one or more hybrid solid-state circuit breakers 14, and a controller 17. The power converter converts power from the main DC bus to provide a regulated output to the auxiliary bus. Each hybrid SSCB includes a main switch 26 connected between the main DC bus and a load and an auxiliary switch 28 connected between the auxiliary DOC bus and the load. The controller selectively turns the main switch and the auxiliary switch On/Off to selectively supply power from the main DC bus and/or the auxiliary DC bus to the load, and to selectively regulate the voltage on the auxiliary DC bus,