Abb Inc.

Ssac, Inc.

Andrzej Julian Gluszek

Carole A Volz

A mode selector apparatus according to the invention includes a variable output device, a control circuit responsive to the output device, and a user perceivable indicator responsive to the control circuit. The control circuit reads the output from the output device to determine if the output indicates a valid mode. If the output of the output device indicates a valid mode, the control circuit controls the user-perceivable indicator to indicate to a user that the mode selector is operating in a valid mode, and generates a valid mode indicating signal at a valid mode indicating output of the apparatus.

Mode selector apparatus

The present invention is a power monitoring circuit for sensing line conditions in a three phase power line. In the circuit a plurality of series connected power supplies for powering various components of the circuit are connected in series with a current sensing element for sensing current supplied to the power supplies. The power supply and current sensing element arrangement, in turn, is connected across a three phase bridge rectifier, which is in communication with the three phase power supply line. A circuit analyzer in communication with the current sensing element senses unbalanced line conditions based at least in part on a signal developed by the current sensing element. Preferably, the circuit further includes a three voltage reducing resistors interposed between the three phase power line and the bridge rectifier for reducing the voltage stresses encountered by the circuit's components.

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Liverpool, NY, United States of America

Andrzej Julian Gluszek