Overload Relays Catalog - Steven Engineering

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Overload Relays and Thermal Unit Selection Class 9065 CONTENTSDescriptionPage General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14Approximate Dimensions and Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-17Thermal Unit Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-42 1998 Square D All Rights Reserved 2 5/98 INTRODUCTION Overload Relays are intended to protect motors, controllers, and branch-circuit conductors against excessive heating due to prolonged motor overcurrents up to and including locked rotor currents. Protection of the motor and the other branch-circuit components from higher currents, due to short circuits or grounds, is a function of the branch-circuit fuses, circuit breakers, or motor short-circuit motors make up a large percentage of power system loads.

© 1998 Square D All Rights Reserved 2 5/98 INTRODUCTION Overload relays are intended to protect motors, controllers, and branch-circuit conductors against

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