| Function description | IEC 61850 identification | IEC 60617 identification | ANSI/IEEE C37.2 device number |
|---|---|---|---|
| Three-phase non-directional overcurrent protection, low stage | PHLPTOC | 3I> | 51P-1 |
| Three-phase non-directional overcurrent protection, high stage | PHHPTOC | 3I>> | 51P-2 |
| Three-phase non-directional overcurrent protection, instantaneous stage | PHIPTOC | 3I>>> | 50P |