Importance

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Abstract

An automatic bus transfer device is provided for single phase and multiphase power systems. The automatic bus transfer device provides infinite isolation and automatic switching from a primary power bus to a secondary power bus when the power (or voltage) being provided by the primary power bus falls below a predetermined level. The automatic bus transfer device includes a relay and a signal detector. The relay includes a master portion and a slave portion. The slave portion has a first input terminal, a second input terminal and an output terminal. The slave portion is switchable from a primary state to a secondary state and vice versa in a manner responsive to the master portion. The output terminal of the slave portion is electrically connected to a primary one of the input terminals when the slave portion is in the primary state and is electrically connected to a secondary one of the input terminals when the slave portion is in the secondary state. When the primary one of the input terminals carries a signal above a predetermined level, the master portion drives the slave portion into the primary state. Similarly, when the primary one of the input terminals of the relay carries a signal below the predetermined level, the slave portion is driven into the secondary state. A switching element is provided for selectively determining which of the input terminals of the relay constitutes the primary terminal.

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First Claim