Side-by-side reference

Understand the difference.

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

First referenceCompare with

32U

Protection functions

Underpower protection

Supervises active power below the documented operating criterion.

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

A distinction that matters

An underpower element measures power; undercurrent 37 can respond differently when voltage or power factor changes.

Full reference

Protection functions

Directional power

Directional power protection uses the direction and magnitude of power according to the implementation and configured purpose. Reverse-power applications are one use encountered in generating systems; the generic device number does not specify the complete application.

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

A distinction that matters

Directional power and directional overcurrent measure different operating quantities. The numbers 32 and 67 are not interchangeable.

Full reference

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