Importance

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Abstract

A circuit breaker protects an electrical multi-phase low-voltage AC circuit. The circuit breaker contains series circuits each made up of a mechanical phase contact and an electronic switch. Each series circuit electrically connects a grid-side phase connection to a load-side phase connection. The mechanical phase contacts are opened together to prevent a flow of current or closed together to allow a flow of current. The electronic switches can be switched, by semiconductor-based switching elements, to a high-impedance state of the switching elements to prevent a flow of current or to a low-impedance state of the switching elements to allow the flow of current. The electronic switches are switched independently of one another to a high-impedance or low-impedance state to prevent or enable a phase-conductor-dependent flow of current. A temperature sensor is provided for each series circuit for determining the temperature level of the respective electronic switch.

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First Claim