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Thermal protection for motors

Thermal protection of a motor can be accomplished by using various protection elements.
ANSI 49 provides over-current protection based on the magnitude of current, both past and present.
The SEPAM 49RMS element uses current magnitude to model the heating effect the current has on the motor windings.
The attached documents provides a detailed description of this protection function and will give you information about Sepam 49RMS protection function for transformer and motor applications.
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