Solid state overload relay

H - Electricity – 02 – H

Patent

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Details

H02H 7/085 (2006.01) H02H 7/08 (2006.01)

Patent

CA 2048062

ABSTRACT OF THE DISCLOSURE An overload control circuit and method of operation for protecting a three-phase motor from damage due to overload includes monitors reading the load on each phase of the motor and circuitry for combining the three separate phase signals into a single combined load signal which triggers the overload circuit. The gain on the combined load signal and the overload trip delay time may be calibrated and monitored by an external meter to provide for accurate and inexpensive calibration to accommodate specific operating characteristics of the motor being monitored. The circuit provides visual readouts of the mode of operation, including: (1) operating mode; (2) overload onset; (3) shut down initiated; and (4) delay to restart.

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