An apparatus characterized by: a connector structured to receive mains power from a vehicle; a first power converter electrically coupled to the connector and structured to receive and condition the mains power; a second power converter electrically coupled to the connector and arranged electrically in parallel with the first power converter and structured to receive and condition the mains power; a conditioned power connector structured to receive conditioned power from the first power converter and the second power converter; a first switch arranged between the first power converter and the conditioned power connector and structured to selectively allow conditioned power to pass from the first power converter to the conditioned power connector; a second switch arranged between the second power converter and the conditioned power connector and structured to selectively allow conditioned power to pass from the second power converter to the conditioned power connector; a first isolated input and a second isolated input each structured to receive the conditioned power from the conditioned power connector; a first isolating switch positioned downstream of the first isolated input; a second isolating switch positioned downstream of the second isolated input; a first EMI filter stage positioned downstream of the first isolating switch; a second EMI filter stage positioned downstream of the second isolating switch; a first local power supply positioned downstream of the first EMI filter stage; a second local power supply positioned downstream of the second EMI filter stage; a circuit card; and a controller (160, 198) structured to monitor the first power converter and the second power converter, actuate the first isolating switch and the second isolating switch to selectively provide conditioned power from one of the first isolated input or the second isolated input to the circuit card, and operate one of the first switch or the second switch to provide conditioned power to the conditioned power connector. a connector structured to receive mains power from a vehicle; a first power converter electrically coupled to the connector and structured to receive and condition the mains power; a second power converter electrically coupled to the connector and arranged electrically in parallel with the first power converter and structured to receive and condition the mains power; a conditioned power connector structured to receive conditioned power from the first power converter and the second power converter; a first switch arranged between the first power converter and the conditioned power connector and structured to selectively allow conditioned power to pass from the first power converter to the conditioned power connector; a second switch arranged between the second power converter and the conditioned power connector and structured to selectively allow conditioned power to pass from the second power converter to the conditioned power connector; a first isolated input and a second isolated input each structured to receive the conditioned power from the conditioned power connector; a first isolating switch positioned downstream of the first isolated input; a second isolating switch positioned downstream of the second isolated input; a first EMI filter stage positioned downstream of the first isolating switch; a second EMI filter stage positioned downstream of the second isolating switch; a first local power supply positioned downstream of the first EMI filter stage; a second local power supply positioned downstream of the second EMI filter stage; a circuit card; and a controller (160, 198) structured to monitor the first power converter and the second power converter, actuate the first isolating switch and the second isolating switch to selectively provide conditioned power from one of the first isolated input or the second isolated input to the circuit card, and operate one of the first switch or the second switch to provide conditioned power to the conditioned power connector. monitor the first power converter and the second power converter, actuate the first isolating switch and the second isolating switch to selectively provide conditioned power from one of the first isolated input or the second isolated input to the circuit card, and operate one of the first switch or the second switch to provide conditioned power to the conditioned power connector.