MOTOR VEHICLE ONBOARD ELECTRICAL SYSTEM SWITCH, MOTOR VEHICLE ONBOARD ELECTRICAL SYSTEM AND METHOD FOR OPERATING A MOTOR VEHICLE ONBOARD ELECTRICAL SYSTEM SWITCH

摘要

The invention relates to a motor vehicle onboard electrical system switch comprising at least two inputs for a respective one of at least two onboard electrical system power supplies, at least one output for a consumer of the motor vehicle, at least two switches, wherein a first switch is arranged between a first of the inputs and a common node point, and a second switch is arranged between a second of the inputs and the common node point, and the output is electrically connected to the common node point, wherein the switches are designed as semiconductor switches and are each connected by their body diodes in the through-flow direction to the common node point, characterised in that a monitoring circuit monitors a first voltage at the first input and/or a second voltage at the second input and/or a voltage at the common node point, and in that the monitoring circuit produces an opening signal according to a magnitude of at least one of the monitored voltages in order to simultaneously open both switches.