Protection system for electric motor

Details Protection system for electric motor Protection system for electric motor

G - Physics

05

D

341/28, 318/86

G05D 23/19 (2006.01) H02H 3/04 (2006.01) H02H 7/085 (2006.01)

Patent

CA 1087708

P R O T E C T I O N S Y S T E M F O R E L E C T R I C M O T O R ABSTRACT OF THE DISCLOSURE A protection system for an electric motor including a safety switch to deenergize the motor upon the occurrence of a potentially deleterious operating condition. The protection system includes a current sensitive device in series with the motor. The device is deenergized when the motor is deenergized due to the occurrence of the deleterious operating condition. The protection system further includes a holding device having a normally closed switch electrically connected thereto. The holding device is energized and its switch is opened when the current sensitive device is energized. The holding device remains energized, even though the current device is deenergized to prevent the motor from being reenergized. The holding device is deenergized to permit reenergization of the motor by the manual opening of a switch connected in series therewith.

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