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Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

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49M

Protection functions

Motor thermal-model protection

Estimates motor thermal duty using the selected relay's motor thermal model.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI / Manufacturer

A distinction that matters

A motor thermal model is distinct from a winding thermostat or an RTD alarm channel; both can coexist.

Full reference

Protection functions

Thermal protection

A thermal protection function responds to a thermal condition or model appropriate to the selected machine or transformer application. Its inputs and implementation vary between devices, so the number alone does not establish a sensor arrangement or a thermal model.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI

A distinction that matters

A thermal relay, temperature sensor and instantaneous overcurrent element are different devices or functions.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.