636LE008146B
Advanced protection functions
5.1 List of protection devices
The sentinel Energy trip unit can accommodate seven optional advanced protection
functions. They enable monitoring and protection of the installation against undervoltage and
overvoltage, underfrequency and overfrequency, excessing reverse active power and voltage
and current unbalances.
The additional protection functions improve installation availability and protect against harmful
disruptions that can inhibit optimal operation of the installation.
Advanced protections
Description ANSI code
Undervoltage protection (UV-27) 27
Overvoltage protection (OV-59) 59
Underfrequency protection (UF-81L) 81L
Overfrequency protection (OF-81H) 81H
Reverse active power protection (RP-32R) 32R
Current unbalance protection (UNBC-46) 46
Voltage unbalance protection (UNBV-47) 47
Advanced protection settings
The advanced protection is adjusted from the ADVANCED PROTECTION menu of the sentinel
Energy display or from the Hager Power setup software.
CAUTION
To use the advanced protections an external 24V DC SELV power supply must be
connected to the circuit breaker.
The advanced protection cannot work without an external power supply.
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